My Helicopter wobbles? Here's why! Tightening my blades fixed it.

[@chockypompom]

3 years later, you are still the best source of information when it comes to this problem. I have a brand new Omphobby m2 with a bad head and tail shake. I watched your video, and then I tightened the blades...problem was solved. Thank you for saving me time and frustration.

[@NightFlyyer]

I am happy to hear that. Thanks so kindly and happy flying.

[@chris-ip4pk]

Clear consise information ,the old boys do it best.greetings from 🇬🇧

[@NightFlyyer]

Thanks very kindly. Fly easy and please be safe!

[@skytalon74]

Was searching YT for wobbles on my new CP heli and this sounds like it! Great detailed video. Thanks.

[@NightFlyyer]

Thanks so kindly. Good luck and happy flying.

[@Skammy5]

You're a madman Dave! No way could I fly in that wind. You are truly a Jedi Helimaster. I watch ALL of your videos. Thank you.

[@NightFlyyer]

True. Like I said, here in the Midwest if you don't learn to fly in the wind, you don't fly! Thanks kindly for your comments!

[@DKoppJr]

Just reviewing the archive before my 450 helicopter build. Great tip Dave.

[@NightFlyyer]

Good luck with it Don. Thanks very much.

[@How-To-RC]

Hey nightflyer. Been a fan since 2005. Still here and still enjoying your heli videos and history lessons 😊

[@NightFlyyer]

Thanks so very kindly. I appreciate your long time support.

[@How-To-RC]

@@NightFlyyer your welcome 😊

[@termite2691]

Those hinges are Lead/Lag hinges: Lead/lag hinge - This allows the blade to move forward and backwards in the plane of the rotor disk. This motion is to deal with a side effect of the flapping hinge. Just like a figure skater who is spinning around and pulls their arms in, as the blade flaps away from a horizontal position the mass of the blade moves closer to the axis of rotation. Thus the blade wants to travel faster. However since this happens for only one blade at a time the rotor hub can’t accelerate to compensate. The lead/lag hinge allows each blade to accelerate and decelerate slightly as is circles the rotor disk, and in so doing reduces vibration and stress on the rotor system. On some full size machines there isn't a hinge as such but a flexible section instead that allows for this movement through flex.

[@NightFlyyer]

This is a ridged head with no flapping hinge. You comments are well taken, but to me and my other helicopter fliers, it is obvious that the downwind blade has no wind resistance and since is flying faster than the wind, it stays straight out. When it becomes the upwind into the wind blade, it is feeling resistance of the wind, and pushed back slightly if the blades are too loose and is not as straight as the downwind blade. They don't have to be so tight not to move, but enough to overcome the wind in high conditions. Tightening the very loose blades fixed my wobble, so it is hard to argue with success.

[@very9000]

Hello. Do you have a video on aligning flybar blades and swash plate?

[@NightFlyyer]

I do not. But it is easy as the swashplate is always set up parallel with the ground and the Flybar paddels the same. Thanks.

[@jesusm.jimenezsr.9528]

I know this vid has being around for some time; but thanks for making it, it save me some head ake. My 120S began to wable, I tighten the blades and problem solve. Thanks for your wisdom.

[@NightFlyyer]

Glad it worked for you. Thanks kindly.

[@SergioNayar]

Awesome info! I was told otherwise but your explanation makes total sense. Will try to fly this way next! Kudos!

[@NightFlyyer]

Thank you Rayan for actually understanding my explanation, because some want to tell me I am totally wrong, even after simply tightening up my blades to be more snug, totally fixed the wobble. Thanks.

[@SergioNayar]

Well, right after watching your video above, I found this other video explaining the same about rotor blade grip torque: kzbin.info/www/bejne/jX-wZWSNa6d0sMk

[@wildgoobsid5]

Very nice videos. Great voice and delivery. I am tinkering with vintage planes and might go to vintage helis.

[@jonnelson5849]

I haven't had one of your videos come up in a while. I know it's been a long time since. Just wanted to check in on you and see how things have worked out for you since the fire. Hoping all is well for you and yours.

[@NightFlyyer]

Thanks very kindly Jon. It's all part of the test of life, I guess. We are getting along thanks to many folks who helped us move forward. Thanks again.

[@thelimike]

This made perfect sense,thank you very much

[@NightFlyyer]

Thank you as well.

[@BOKI797]

Night Flyer Dave that sure was a Nice Video explaining Wobble ! Great Flying also ! Thanks for the Video

[@NightFlyyer]

Thanks very much!

[@NightFlyyer]

* UPDATE. Its just simple Physics! The wobble only happened in the heavy wind flying. Also, this IS a modern flybar helicopter compared to the EH 1 heli I compared it to. Since I was fixing the wobble on a this particular flybar machine, and not to a flybarless heli (that I also have owned and flown extensively before they got all burned up in the fire), I stuck with the like helis for my comparison comment. Flybarless are MORE modern for sure. I learned to fly on the very first helis ever made and with no gyros or cheater radios, and believe me, this T Rex is modern, COMPARED to the old Flybar helis. Be that as it may, tightening the very loose blades fixed my wobble, so it is hard to argue with success. Some are telling me my explanation is wrong but offered no solutions, even though simply tightening my blades to be snug, (one was looser than the other) totally fixed the wobble! Again, even with perfectly manufactured blades and perfectly balanced, with head speeds around 1250, the horizontally hinged blade with one bolt that is advancing into the wind, gets slightly pushed back by wind resistance, making it not in line comparedd to the other blade. This allows the rotor disc to be slightly out of balance, thus the wobble. In 3d mode around 2500-2600 rpm, the centrifugal force is so high, the blade stays closer to actual alignment and symmetrical, so it does not wobble. The more the wind, the more the misalignment, and the more the wobble. If you held the advancing blade with your hand to try to stop it during start up, like a heavy wind, the Blade would fold back or lag. It cannot possibly lead. The other blade stays straight out by centrifugal force and since it is going faster than the wind, it cannot lag. Others have many other words for it, but us old time heli fliers called it wobble. The EH 1 in this video only spins at 1000 RPM, has a tight blades but never wobbles, so telling me the head speed is too low seems to be erroneous. Tightening the blades can help reduce the wobble at low head speeds and simply worth a try if you have this problem too. There is nothing to lose to try it. Thanks for watching and subscribing.

[@blackturbine]

NightFlyyer thanks this will help a lot in my helicopter project

[@melvinw.quinene841]

Thank You Sir for the info, that figures why my blade 120 S2 wobbles so much, I don't tighten the blades to much their quite loose on the blade grip, I'll give this suggestion a test run come sun up. SEMPER FI SIR !

[@NightFlyyer]

Thanks and good luck. Happy flying and Semper Fi to you and happy new year as well.

[@halleffect1]

Dave still has muscles. I gotta find out what this guy eats.

[@monkfry]

I remember the cable going to the tv remote, 2 channels, the National Anthem playing at midnight with the Indian crying by the river and then a test pattern or fuzz until the next morning but I NEVER had a cable going to a helicopter!! 😆 You’re a pioneer no doubt and I’m grateful for guys like you. Otherwise I wouldn’t have all the good times crashing, I mean flying my 🦖 nitro 600. Boy, all the AAs that we’ve killed in our lives. . .

[@NightFlyyer]

Haha. Fantastic comment. Thanks!

[@monkfry]

A lot of people aren’t aware that the Indian in that pollution add was actually an Italian actor. Keep up the good work boss! We all appreciate it. 👍 excellent shirt btw lol!

[@asifheliRC]

Good physics of HELICOPTER.Thanks.same problem exited in my heli.after watching your video.I got it...I want to known the best way to center swash plate in main shaft.

[@NightFlyyer]

Thanks kindly. Glad you understand as this is just simple physics. I am not sure of your question. The swash plate's bearing is always centered so cannot change. Happy flying.

[@emsman59]

Great informative video!

[@NightFlyyer]

Thanks kindly.

[@dwightbailey8754]

Great to see you Dave

[@NightFlyyer]

Thank you Garfield!

[@pongosp]

Thanks Mr. Herbert, good info as always

[@NightFlyyer]

Thank you Paul.

[@Dragon69FlyTeam]

Thank you for teaching me another lesson, i always wonderd that why at low headspead i got such a wobble and at higher headspeed it go's away in my scale 450 builds. and why in calm day never noticed it. a tought i had a bad main schaft but this is great info. Now i have to figure out how tight is tight. i hate it with all those drones the heli got less populair. i love scale builds. (not a drone hater i have more than i can count, miss scale helis. gets harder and harder to get a nice fuselage)

[@NightFlyyer]

Thanks kindly and glad you understand the physics behind it. I keep mine snug, so if I hold it sideways, the blades do not fall or drop. In this case I had one blade looser than the other. Just tighten till the wobble goes away. I agree with you about the helis. Flying a heli is far more exciting and fun to watch (for me and my friends) than flying an elevator drone. My friends and I have FPV's too, but we still love the excitement of a heli. Be well and happy flying.

[@Dragon69FlyTeam]

Thank you sir. You are the reason why i started fyling heli's years ago again after some big failure and self thougt flying. we didnt have youtube then. then wen i saw youre channel i tried it again. now years later i own a whole fleed of rc stuff. thx again

[@poochies0316]

I’ve got two Roban 470 scale cobras that normally fly good at hover rpm but wobble badly on ground with a resonant frequency tried tightening and loosening blade grips no wind etc just no help have found stock blades way off in chord wise and cg balance so trying that now thx for the input I was feeling lonely with my problems 😂

[@Dragon69FlyTeam]

@@poochies0316 I still have a 500 size cobra hanging on my ceiling. maiden flight didnt end wel. i took off and 5 seconds in hoover the tail gear system (where the tail bends) self destructed. i dont know how but some how i crash landed while spinning around without any damage to the body. reassembled never flown again 😅 i just dont trust that gearbox anymore. i tend to go down in headspead a lot on my scale birds. that seems to increase the wobble to for me. Higher headspeed solved my problem and now my blades are looser mounted to. if i could find a good brushles direct drive for my 500 size cobra i would fly it again. Nice cobra you have btw i saw youre channel 👍

[@poochies0316]

@@Dragon69FlyTeam I just spent much research and time and after 6 months of resonant frequency issues at lower rpm finally did cg balance on blades and it’s a miracle no more wobble and trying to shake it apart ! The 470 45 degree box is belt drive I shimmed the box a bit as it was pinching too tight and bearings not rotating freely so far after 6 months belt still tight and holding up well , they’re definitely for the more mechanically inclined folks that love to tinker then tinker some more then take it all apart and inspect everything lol 😂

[@ramonmejias2178]

What are your settings on your transmitter and trex 500

[@NightFlyyer]

Throttle curve. 1-0, 2-27, 3-50, 4-70, 5-92% 3d is set for all 90% across the board. Pitch curve is: 1-15, 2-35, 3-55, 4-73, 5-95% These of course are just my settings, yours could vary some. Good luck and happy flying.

[@ramonmejias2178]

Thanks this really helps you're the best

[@ramonmejias2178]

@@NightFlyyer hey would you be interested Ina few futaba items I recently purchased a trex 450 and put it on my dx6e if you would like to see them let me know

[@NightFlyyer]

@@ramonmejias2178 Thanks. I appreciate that but I still havent even been able to fly my new Align T rex 470 Dominator, I'll have to pass. Thanks.

[@vinnyp8574]

What ur throttle set for 3D mode ??and normal flying

[@NightFlyyer]

For 3d I have it set for 90% across the curve. A straight line. For normal, just the normal curve, 0, 25, 50,75, 100%

[@briekhnaa]

Good informations. I had this problem with my Trex 550x. I thought bad main shaft or main bearings could be the reason. Now I will tight main blade screws and try to fox this issue.

[@NightFlyyer]

If the blades are out of balance or the flybar, or the shaft is bent, it will not help much, but hopefully it does. Good luck.

[@briekhnaa]

Thank you.

[@ruedigersonntag9315]

Always been curious about where this wobble came from Now its so obvious, thanks to your vid

[@NightFlyyer]

Thanks Kindly Ruediger!

[@ruedigersonntag9315]

Hi Dave, from time to time I hover and circle my Trex 500 ESP in my backyard and even without gusty wind it wobbles at moderate headspeed, especially at sudden, hard cyclic inputs. I expected the damping rubbers first, Btw I like oldschool flybar

[@NightFlyyer]

@@ruedigersonntag9315 Sometimes the shaft is slightly bent or the flybar paddles are out of balance too. That can add to the wobble, especially if the blades are too loose.

[@MrSmartstots]

Great video, thanks for the explanation

[@NightFlyyer]

Thanks so much!

[@HellTriX]

Glad i watched this before i modify my new blanes to fit my rotor. I have to shave them down to fit into the rotorhead, so I will make sure they stay a really snug fit.

[@NightFlyyer]

Thanks kindly!

[@weberbuiltweber1908]

One of coolest shirts ever!

[@NightFlyyer]

Thanks much!

[@Raptor50aus]

Great informative video yet again Dave.

[@NightFlyyer]

Thank you very kindly!

[@blackturbine]

I never thought about it you could probably drill 3mm hole for the pin close to the main blade pin from the inside if there is enough room for it

[@NightFlyyer]

Possible, but it would have to be perfect! Just tighten the bolts down and the centrifugal force will get it closer and it will stay better.

[@blackturbine]

NightFlyyer I will try it out but right now there is so much wind that shakes a car

[@garrykennedy5484]

Dave... That wobble you see? Try stiffer feathering shaft bushings. It will go away. It's NOT the wind doing that. I've been there and done that. You have something else out of balance like the feathering shaft or mains if the bushings don't do it. It's NOT the wind. I don't mean to sound,,,,,,, mean???? I really don't. But I have been there with this problem on some flybar machines including my original EXI (trex clone) 500 heli. It was great until the feathering shaft bushings softened up. Then I went with Polyurethane and it was great. You ARE right that the wind affects it though. Great piloting skills too man. Really awesome!!!!!!

[@NightFlyyer]

I got you and your not being mean. The feathering shafts, if bent or bushings are worn can certainly cause problems but these are tight and virtually only have about 15 flights on them. I checked them first. But in calm days there was no wobble whatsoever. I have since tightened up the blades, and the wobble went away, hence the reason I made this video. I appreciate your comments and suggestions for sure! Thanks for the kudos!

[@dougkubash8673]

very good information - Thanks Dave!

[@NightFlyyer]

Thanks Doug !

[@BlažPetrinčič]

Love your T-shirt!!!Very very nice colection of hellis!!!!

[@NightFlyyer]

Haha. Thanks much. 99% of those helis were sent to me after my fire. They all needed repair too, but all fly good now. Thanks again!

[@DKoppJr]

A very informative video....... Thanks Dave..... I don't use low head speeds.....not that good of a pilot yet, but I also tighten the blades in the holders after transporting. Great video!!!

[@NightFlyyer]

Thanks Don! I appreciate that.

[@DKoppJr]

NightFlyyer , anytime!!! .....You have time tested experience...... Always the best advice...thank you for sharing.

[@ericness9744]

Some good info here, thanks Dave

[@NightFlyyer]

Thanks much, Eric.

[@traxxi2003]

Interesting! My Goblin 700 has this exact behavior at low head speeds, should I tighten the blade bolts and see if that would help?

[@NightFlyyer]

Works for me. Nothing to lose to try it.

[@johno9507]

My MaUsa X-Cell .60 (Miniature Aircraft USA) used to specify how tight the bolts should be by holding the tip of the blade and trying to turn the rotor by the tip of the flybar. The flybar should bow by one inch before the bolt/blade should slip. All to often I see guys at the field with tail/main blades that are so loose that they just flop about under their own weight. Every book I've read says there should be SIGNIFICANT resistance to counter leed/lag of the blades!

[@NightFlyyer]

True, and many other Models too. Rigid rotors don't need that. All the real helicopters I flew and worked on in the Marine Corps for 33 years, have rigid rotors. They do not move and only 1 bolt is removed to fold them back, but in flight, they are rigid and don't wobble.

[@johno9507]

@@NightFlyyer Just for my own curiosity what Marine Corps helis used rigid rotors? The CH-53, CH-46, MH-60 use fully articulated heads with leed/lag dampers and the UH-1 & AH-1 use a semi-rigid teetering head with leed/lag dampers.

[@NightFlyyer]

@@johno9507 Teetering is different than Rigidly bolted so they remain at 90 degrees to the Rotor mast, like I did with this heli.

[@scottyh72]

Read up on Cierva and lead lag. He is the one that figured out why the blades should hinged.

[@NightFlyyer]

Hinging is fine. But my blades were too loose and I showed why the heavy gusty wind I flew in pushed against the advancing blade and causing it to be out of line with the downwind blade causing the wobble at hover. I tightened the blades to be more snug and the wobble went away.

[@MitchG]

the blades are not leading and lagging in flight because of the wind. If they were, the blades and grips would be worn down in one flight because of the lack of a bearing. The wobble at low headspeed is just resonance because the dampers installed in the head were designed stiff to handle a certain rpm range. Also if you tighten the blade really stiff like you recommend then it takes a higher headspeed until the blades straighten out. If you loosen the blade a little then they will straighten out at a lower headspeed and you can fly lower rpm without wobbles. You only want the blades tight enough so they dont fold as you throttle up. One last note, your trex500 with a flybar is not "modern". sorry just trying to spread the truth here not hurt feelings

[@NightFlyyer]

Well the truth is, this is a ridged rotor with NO flapping hinge or dampeners. You comments are well taken, and I appreciate them, but to me and my other helicopter fliers, it's been discussed extensively and agreed that the downwind blade has no wind resistance and since it is flying faster than the wind, it stays straight out. When it becomes the upwind blade, it begins feeling resistance of the wind, and pushed back slightly if the blades are TOO loose and becomes not as straight as the downwind blade and wobble begins. There are other factors for sure, but this is also a viable one. The Blades don't have to be so tight not to move, but enough to Help overcome the wind (during Hover) in high wind or gusty conditions. Also this IS a modern flybar helicopter compared to the EH 1 heli I compared it to. Since I was fixing the wobble on a this particular flybar machine, and not to a flybarless heli that I also have owned and flown extensively before they got all burned up in the fire, I had to stick with the like items. Flybarless are MORE modern for sure. I learned to fly on the very first helis ever made and with no gyros or cheater radios, and believe me, this T Rex is modern, COMPARED to those old Flybar helis. Be that as it may, tightening the very loose blades fixed my wobble, so it is hard to argue with success. Thanks again for your comments.

[@MitchG]

I say again. The blade is not lagging behind because of the wind. Doesn't matter what you or your friends discuss. Spreading false Info is not helping. Did you know that semi rigid and fully articulated rotors, the advancing blade (into the wind) actually leads into the wind as the blade flaps up. Since most Rc helis have rubber dampers that allow the spindle to move they are semi rigid and the flapping motion of the advancing blade would actually cause that blade to try and lead, not lag

[@NightFlyyer]

It's Not false info, as simply tightening my blades (one was looser than the other) completely fixed the wobble.

[@SoCal780]

My personal experience is to have the blades somewhat tight (but not completely rigid) and straighten them out as (best as possible using

[@SoCal780]

the naked eye) and I have never once had a wobbling issue. I have found that I can get them almost perfectly straight before I even touch the throttle. This way, I get a very smooth liftoff as well as a smooth flight and landing as well. Works for me and has worked successfully for the last 9 years. I’ll put my money on Nightflyyer’s experience and wisdom EVERY SINGLE TIME! He is, after all, the man who taught me how to fly in the first place!

[@budparriott8054]

Great video Dave..!

[@NightFlyyer]

Thanks Bud.

[@thafactor24]

Thanks for the info bro I've wrecked all my helicopters so much I quit flying them after I've rebuilt them 😊

[@scottfirman]

No gyro! I cannot see how you even flew such things. No way O could fly anything like that old heli. I am looking at something like the blade 320 as my next heli before moving up to the Align450 I have. What do you think. Great video! Now days everything is flybarless. Texhnology changes so much year to year, it only makes sence to upgrade to a new craft every few years.

[@ryanstricklin5304]

First off thank you for your service Dave! I have a blade 400 3d that has never been of the ground because I cant balance the blades or the fly bar is not adjusted properly. I the guy I got it from completely disassembled it for some reason. So watching your videos and others I managed to put it together with only those 2 issues. Any advice you could give would be great. I'd love to send it to you and let you fly for the first time if you'd like. I have alot of spare parts for it. Thank in advance!

[@NightFlyyer]

I made lots of vids on this heli. Do you have enough blade pitch? What do you mean by saying it's not off the ground? I don't usually set up others machines because the last time I set up a heli for a guy, he crashed it right away and then blamed me! turned out later he admitted it was his inexperience. Go to local hobby shop and ask if any good heli guys are around or in the local club. A good pilot will fix it for you and be happy to.

[@ryanstricklin5304]

NightFlyyer I wish I had that option. None of the hoppy shops around here know anything about helis. Its only been about 2 feet off the ground and I stopped it because I didn't want to damage it. Its brand new in the box with the original paper. Just never could balance the blades or flybar. Its sitting in the closet, I'd gladly sent to you and if you wanted to mess with that would be cool if not you could have it. I didn't think about the heli guys at the air field. Either way its collecting dust in the closet and is brand new.

[@NightFlyyer]

If you really want to send it, I will mess with it and make a video of my findings, giving you full credit for sending it to me as I have done with other heli donors since my blade 400s were all burned up in the fire. Send it to Dave Herbert PO box 153, Sibley IA 51249. Do dot send ups or fedex as they wont deliver to po box. Use us mail. Thanks very kindly for generosity!

[@jq5890]

Nice lesson learned there, good to know. Thanks Dave :)

[@NightFlyyer]

Thanks Jason!

[@xpertcrush]

Dear Sir, i have been watching your videos since 2009 they helped me learn helicopter flying, few days back i started building a heli again and here we are, found again your helpful videos. Thank you so much for everything sir. i have a video on my channel about esc, if you know that esc or how to program it. it will be much help.

[@NightFlyyer]

Sorry I cant tell from your video. It looks like a generic one that came with Xheli helicopters. They program a lot the same. Each beep identifies things like Battery cell count, brake and timing. Try searching how to program esc's and you might find a way to turn it on. Check with Castle Creations, as they may be able to help you out too. Thanks kindly and good luck.

[@xpertcrush]

@@NightFlyyer in video i entered it into programming mode, as you can hear it beeped differently 14 times, that means it has 14 menus to work on. i don't know the order, i just know first one is break because i tried it and it has 4 options. first is off second very soft third soft and 4th is hard. I have already extensively searched over internet for it. i lost its label in 2011 due to crash on copterX. since then i was not flying anything. found myself kit of hk450 tt pro and some spares so worked on it due to lockdown. Thank you so much Sir for looking into it. Much appreciated.

[@xpertcrush]

@@NightFlyyer Sir, the reason i want its manual is, my motor turnigy typhoon 2215 is getting very hot in just a minute of hover. thought it might be issue with timing. both esc and motor is hot, motor is like very hot and esc is hot.

[@xpertcrush]

@@NightFlyyer Dear Sir, i found this. lh6.googleusercontent.com/proxy/Booo-tYuSDsGXgqEPGV4_SozBbTUQYj0OIiWShvRbCShiI7YzRoDcFTT10U2pjbDFTwVP3mcyEg7gyANg1U81QnBx1dEcOg do you think its like the one i have?

[@xpertcrush]

@@NightFlyyer finally found it after searching for days kzbin.info/www/bejne/q5awXmimd5mae5o hope this will help fellow hobbyist

[@ranger1244]

I have a blade 400. I’m getting a different kind of wobble. I believe it’s from the gyro.

[@NightFlyyer]

We call that tail wag. Turn down the sensitivity and it will stop.

[@ranger1244]

NightFlyyer thank you sir.

[@emsman59]

Dave...how tight should we make our blades?

[@NightFlyyer]

I make mine fairly tight. That is hard to define, but make sure they can move some and be able to straighten out under centrifugal force.

[@emsman59]

@@NightFlyyer Thanks Dave. Some folks have them flopping all over the place. I never could quite understand that?

[@NightFlyyer]

@@emsman59 I know. They think if they crash, the blades will fold and not break. Never in my experience. Something always breaks. Thanks.

[@gailraby1722]

the blades moving is there to help with transitional lift in forward flight, full size helicopters have the same movement but it has a damper to hold the blades in a hover, if you have the blades tight so it doesn't wobble in hover you would struggle in fast forward flight as the helicopter would want to bank away from the advancing blade. RC helicopters are a compromise.

[@NightFlyyer]

Well I didn't see that on my marine corps helis. All my early helis hat 2 bolts and blades didn't move, just like the skylark in this video and it goes into forward flight as my others did just fine!

[@gailraby1722]

+NightFlyyer in fast forward flight you'd have to use a lot of trim to maintain level flight the helicopter would want to bank away from the advancing blade, that slight retardation helps with that, I'm not clued up on early helis but that is the case with modern ones. it's transitional lift the governs the forward speed of a helicopter, they just get more lift on one side of the rota disc and once you're at the limit of trim it'll start banking.

[@NightFlyyer]

I never have To trim any of mine, so don't know. Besides this video was about wobble caused by advancing blade being resisted by high winds and then logically explained by real heli and model expeirience.

[@gailraby1722]

+NightFlyyer I'm not knocking your video, I enjoy your vids and I'm sure you know what you are talking about, I was just trying to add a little more information about why the blades move in that way. I can't remember what the hinge is called but helicopter designers go to great lengths to include them on full size helicopters for the reasons I mentioned. Rc helicopter spend a lot more time in hover than full sized, and of course the wind is proportional so has far more effect on a scale heli. and they don't tend to have dampers so the effect of strong wind is greatly exaggerated. you mentioned in the video that you didn't know why the blades moved (apart from making it easier to get in the car) so I was just trying to tell you. like I said, I enjoy your videos and didn't mean any disrespect.

[@NightFlyyer]

I understand that and thanks. I just know that when I started flying RC helis, they were in there infancy and I have seen all kinds of heads and configurations over the years. All of the early ones started out with Fixed rotors that could not be folded and I never saw any of them wobble, as some of my newer ones do with one bolt. Since one of my blades was looser than the other, I completely eliminated the wobble by tightening them up. BTW, this is a ridged head, and has no flapping hinge or bushings that can get worn. When I was on the carrier, I spent many hours studying the big helis. The experts told me the only reason the blades fold, was to be able to have room to park them in and on the carrier. But you must be a heli pilot or engineer, thus your comments are valid. I only know what worked for me to stop the wobble and the main reason behind this video. Thanks and relax!

Tightening a modern RC helicopters blades too tight makes it wobble! They are actually supposed to lag/lead. Your old RC would be a rigid rotor system which is a bit different. The explanation for why lead/lag is needed is due to dissymmetry of lift, which in turn induces bending of the blades (no flapping hinges on these) and therefor moves the CoG closer to the mast, making the blade take a "shortcut", and here the lead/lag reduces the torque on the hub. The lead/lag in effect removes a coupling that can cause vibration/wobbling. Hence why you need to not restrict the movement of the blades! Yes, these effect are tiny due to very rigid blades, but I think this is the correct explanation. I have also many times removed wobbling myself by not overtightening the blades, so it is not made up. And yes, low head-speed will make these helicopters wobble. It is possible that low speeeds changes the dynamics enough that lead/lag is suddenly bad.

[@NightFlyyer]

All true, I only tightened them up to be snug, not completely tight. This is a ridged head with no Flapping hinge. However when the wind is strong, the lead/Lag is unbalanced as I tried to show in the video. One of my blades was quite loose, compared to the other, so when I tightened them to be equal, my wobble disappeared in the wind. There was no wobble on calm days, even with the looser blades, hence the video. Thanks for your comments.

[@frankienv3906]

everytime my heli wobbled i tightened the blade bolts and it fixed it, but i never knew why, sometimes i added weights to my heli and that fixed the wobble because It increased head speed, but it all makes sense now :-)

[@NightFlyyer]

Thanks Frankie. I am glad you understood what I tried to point out by added wind resistance on the leading blade. Some times if one blade is looser, this also causes wobble, when it advances into the wind.

[@SoCal780]

Oops! I personally always preferred my blades a little on the tighter side. I just never liked them “wobbling” around loosely like some ppl do.

[@NightFlyyer]

Thanks Scott. I'm with you!

[@mikepearson5751]

Hey I have an Kyosho 30 size an am having trouble getting it set up. I’m not sure if I need another transmitter but I’m trying to use a dx6i spektrum will this work? An a thank you

[@NightFlyyer]

A DX6i Will work Perfectly. I use one on my Nexus .30 There is no fancy mixing needed that it cant handle. Good luck and your welcome.

[@davidakin1481]

Great info

[@NightFlyyer]

Thanks a lot, David.

[@pongosp]

Another question Mr. Dave, regarding tightness of the blade grip bolts if they are too tight would that cause vibration at the head? Because on my Trex 500x every time i service the head i have to remove the blades and i can't get the right tightness of the blade grip bolts when the heli spools up again. i get this vibration and then i have to lower the throttle and spin the blades by hand to get them spinning and then i can go to half throttle so that the blades find their right position when they swing out and then i can tighten the blade grip bolts a little at a time until i find the right tension on the blade grips. Sometimes i have to repeat this a few times before i can get to flying. Sorry about the long explanation basically how can you set the right tension on the blade grips? Thanks

[@NightFlyyer]

You don't want to tighten too tight, but even so the centrifugal force in 3D mode will straighten them out so blades are perfectly symmetrical ! If balanced properly, there will be no vibration.

[@garrykennedy5484]

I LOVE that shirt!!!!!!!!!!! LOL Flybarred these days? Nice. I have one left. A Gaui 425. I also have the flybarless one on a Kbar. LOL

[@NightFlyyer]

Yes. These helis were all sent to me after my big fire destroyed all my helis, including my flybarless ones. Glad you like the shirt.

[@Jon_Flys_RC]

1250 is quite a low head speed for that helicopter. I’m just learning to fly mine and set up per the manual I’m running around 2200 rpm head speed on a 6s 3000 and it doesn’t wobble. That is for general flight pitch is 5-6 degrees at 75% throttle and 11 degrees at 100% throttle

[@NightFlyyer]

1300 to 1400 is hover speed my 3 d speed is more to your speeds.

[@AjaySharma-og8iy]

Sir, can we make a helicopter with chainsaw engine.?? Plz give me reply.

[@NightFlyyer]

Unlikely! My big old Hughes was powered with a Weed eater Echo 120 engine, but that heli was much bigger.

[@jrb8081]

Thanks

[@NightFlyyer]

Your welcome!

[@engineerahmed7248]

Thanks for sharing your knowledge....Means, Fixed Pitch heli pilots wanting to hover r out of luck !!

[@NightFlyyer]

Thanks. They were all fixed pitch in the beginning including the skylark eh1. It hovers fine. So no one is out of luck.

[@tlee9484]

And now we know 👍. I have an old axe cpv3. Heli-max....lol.. Occasionally, it would make me feel like a terrible pilot...lol.. I guess it isn't ALL me 😎👍.another enjoyable,& informative video.

[@NightFlyyer]

Thanks Mr. Lee. I appreciate that.

[@tlee9484]

NightFlyyer. We appreciate your videos..I've Been watching, from the Styrofoam pico , helicopter days . They would wear out a lot faster than today's stuff. But they were great fun..😎👍

[@ddjj868]

You can actually see it with video. With eyes you can't see it

[@NightFlyyer]

True.

[@kennedy796]

Love the video! But this makes me wonder how big a rc heli could be. If a rotor only turns about 3000 rpm, perhaps a upside down lawnmower engine could run it, with proper oiling 🤔

[@NightFlyyer]

Well anything can be made r/c these days. 3000 rpm is very fast. A full size ch 53 super stallions rpm is 189 and slow compared to models. I had a Hughes 300 that had a weed eater engine and it flew great. A lawn mower engine might work but would need lots of hp as weight is a big concern. Go for it. Thanks.

[@kennedy796]

NightFlyyer one could negate the hp issue by simply running a reduction drive

[@bushpilot-bm3kf]

I had thoughts like that, when i was 7 or 8.LOL

[@kennedy796]

bushpilot2001 still an awesome thought. Easy to find engines and parts for it.

[@NavapolTRex700]

*_Very_*___*nice*__*video*_ 👍

[@NightFlyyer]

Thanks very kindly!

[@jeffkraus1457]

how tight?

[@NightFlyyer]

Real helicopters are fixed in flight, so for me, I tighten it pretty tight, or at least till it stops wobbling.

[@BreatheRC]

Nice one thanks dave :)

[@NightFlyyer]

Thank you!

[@aminebob6915]

Good

[@juliaruiz9442]

My helicopter is big too my helicopter name is rc helicopter big red blue

[@NightFlyyer]

Thats nice. Stay well and happy flying.

[@waynecampbell9714]

We call it tail wagging

[@NightFlyyer]

We call out of tune Gyros, tail wagging, which is different.

[@Dogdocphil]

Head speed WAY too low!

[@NightFlyyer]

Slow RPM, is zero to what ever hovers, and no more. I do not take off in 3d, high rpm mode typically. Tightening the very loose blades fixed my wobble, so it is hard to argue with success.

[@phantomx.t.v6610]

This video didn’t help any it honestly made it worse

[@reparacionesrccolombia9667]

Thanks

[@NightFlyyer]

Your welcome.