FPV Wing Build Video - 44" KFm-2 Delta Wing

[@ChrisFredriksson]

Dont say its a pain to watch in 5 times speed, I'm here 1,5 year later and I love watching it! Great tips, will use them when building my own soon =) Thanks!

[@gregory8282]

Excellent video! Detailed, simple and easy to follow... Thanks.

[@xeriamaned]

Hi, I made the KFM 4 some time ago and unfortunately put the wrong motor in it which was under powered. It did fly but only at full throttle. It unfortunately crashed and I'm going to make another as soon as. Having looked at the various types and some saying there is no need for equal steps top and bottom, I'm inclined to experiment with a 1/2" top step and a 1/4" step on the bottom sheet. I'd be interested on your thought's with this if it would give a 'best of both types' performance. Also I like the idea of just going with the 1/2" foam on top of the base sheet rather than all those laminates. The other benefit to a thin bottom sheet would be the A frame spars can be installed there out of the way.

[@UnlimitedVertical]

It seems like pretty sound logic to me. I'd be interested to see how it flies. I have a KFm3 design wing (not flying wing) which was too thick (all 1/2" steps), I am thinking of revisiting it similarly with 1/4" steps.

[@MortenHolck]

Excellent video.....made me wanna try building one ;-)

[@UnlimitedVertical]

My favourite wing design. The kfm2 fpv44 is my best overall wing. Pretty easy to build too.

[@MortenHolck]

Looks great!

[@vanshsharma1303]

hey i saw a 2200kv ntm prop drive motor and it says the esc should be around 40-60a ,,,,,BUT in its description it is written with a 6x4 propeller and an input of 11.1 volts it creates 28a .....so can i go with a 35a esc (as i am using a 3s 11.1 v battery)

[@Mar1wan1]

Thanks for the quick reply..ur a great builder..what is this foam u ise called? Do u have any scratch plqns for this wing?

[@UnlimitedVertical]

Thanks :-) The foam I used is called Dow Cladmate. I got it from Lowes (in Canada). It comes in 2'x'8' sheets and I use the 1/2" thick variety. It's called XPS (Extruded Polystyrene) foam. Other people have used the pink rigid foam insulation that Home Depot sells with good results and even dollar tree foamboard (you'd probably need a total of 4 layers thick by two sheets wide for this plane). Still, 8 sheets of that foam come to around $10. I made this plane out 2'x8' of one sheet of cladmate ($7). For plans, were you looking just for the dimensions or something more?

[@UnlimitedVertical]

There are plans at the end of the video (starting around 21:14) which show the dimensions.

[@MrSupersurinamer]

Nice video ! What is the thickness of the foam in mm ? I wanna build this to. Thank you

[@UnlimitedVertical]

It's 1/2" dow cladmade... that is approximately 12.7mm anything close should work fine. Good luck with your build.

[@shreeshamath007]

very good and handy plane...may i kno how to turn flight left and right also how to take off and how to bring it to the ground..plz let me kno the controllers.

[@UnlimitedVertical]

I'm not sure I understand the question. My transmitter is what you call "mode 2", that means the throttle channel is on the left stick. So, to make the motor spin faster you push the left stick forward. The other controls for this wing are on the right stick. Left and right are accomplished by moving the right stick to the left and to the right. When you push the right stick forward the airplane with pitch downward and when you pull the right stick toward you the airplane will pitch upward. For takeoff, I generally put it at about 3/4 throttle, hold the plane in my right hand with my thumb facing downward and toss it as straight as I can at about a 30 degree angle, then immediately move my right hand to the right stick and usually pull up a bit.

[@shreeshamath007]

I got what I required...and last question..u got two servos der..so which servo u use for letf right moment? and which servo u use for landing and take off??

[@UnlimitedVertical]

shreesha math Both servos are used for both. It's known as Elevon mixing, they each control their movements as if they were both Ailerons and Elevators. So, if you aren't going left/right, then they act as if they are two halves of an elevator. If you there aren't trying to go up/down then they act as if they are left/right aileron. If you are doing both at the same time, then they mix the two together. Most mid range and up transmitters support elevon mixing. For basic transmitters there is a hardware piece you can put in between the receiver and the servos to do the mixing.

[@shreeshamath007]

Oh dats great...thanks I got to kno many things...thank you bro

[@UnlimitedVertical]

shreesha math no problem

[@RCWASPOVISION]

What material do you use for the winglets? Are they rigid or flexible? Thanks!

[@UnlimitedVertical]

On this wing it was dollar tree foamboard (about 1/4" thick). On another wing it was 1/2" extruded polystyrene. I think if I was doing ti again I would use corrugated plastic and only put the winglets above the wing. That way they don't get torn off during a landing.

[@RCWASPOVISION]

UnlimitedVertical Thanks for the info. I always wonder what people use for winglets as I'm not sure if they have to be of a specific material or if they have to be particularly rigid or not. I've seen people using 3mm corflute/coraplast which is quite flimsy and others using 5mm which is a lot stiffer. Then some are using 3mm partical board which is heavier. Get's a bit confusing at times but makes me think it doesn't really matter what you use?

[@jendabekCZ]

RCWASPOVISION It doesnt matter, just use any piece of board which can survive landings and isn't too heavy.

[@WorksopGimp]

Thanks

[@vanshsharma1303]

where can i get a motor mount suitable for this motor ,,,,, pls send me a link to that :)

[@UnlimitedVertical]

vansh Sharma I just use angled steel from home supply stores (should only a dollar or so). Here's a link from amazon just for reference www.amazon.com/Simpson-Strong-Tie-Angle-Corner/dp/B003676RD8

[@davidwood4325]

How thick does the foam have to b pls

[@geodezix]

More info on survey wire, what diameter, don't see it at homedepot.com; are you sure that's what it's called? Thanks.

[@UnlimitedVertical]

+geo dezix Try stake flags or irrigation flags. I think these might be the ones I bought. www.homedepot.com/p/Empire-3-5-in-x-2-5-in-Glo-Orange-Flag-Stakes-100-Pack-78-002/100148662

[@ChrisFredriksson]

Hey there, Just wanted to check what kind of prop you used for this motor, do you remember? It only says what prop you should use for 2S and 4S in the description of the motor on HK, but it says nothing about 3S and the ESC is 2S-3S so I guess you're using a 3S battery? I hope that at least ;)

[@UnlimitedVertical]

Excellent question...lol I can't remember, but a 7x5 would be too small. It is likely that I used a 9x6. If I remember I will check later today.

[@ChrisFredriksson]

UnlimitedVertical Hehe alright! :) I would be happy if you could :) Also, what kind of battery did you use? 3S perhaps? What about the rest of the specs, like C rating and such. I'm really new to picking the right parts, so these videos certainly help, you should know that! :)

[@UnlimitedVertical]

Chris Fredriksson I'm pretty sure I was using a 2200mAh 3s with 25C-35C rating. I had a fair bit of camera weight up front, so if you're not carrying a heavy camera (gopro/sj4000/etc) you could go heavier on the battery (or move the motor forward). Pushing the battery all the way forward will also help if you don't have extra camera weight.

[@ChrisFredriksson]

UnlimitedVertical Sweet! Well I will for sure go for either or both FPV and recording camera. The ultimate goal is both, and I have both, but I should get used to flying before strapping too much onto there ;) Otherwise I'll have to blame the cold air, like on your recent video ;) hehe.. Something wrong with the air! ;) Really appreciate your time and help on this! I hope you get time to check on the props later on as well, but now.. I'm off to bed here in Sweden ;)

[@UnlimitedVertical]

Chris Fredriksson agreed, get it in the air first...then add some dummy weight to approximate the equipment. That way you will know how it handles (especially on launch) before you put gear on it.

[@GAZELL_Racing]

Your a legend, awesome skills!check some of my vids that a mounted a gopro to a stryker f27q to over the Pennines,you may want to turn the volume down though...

[@MultiKaputtmacher]

can i also fly this with a 3000 kv motor? thanks :)

[@UnlimitedVertical]

In general I would say yes, but it really depends on the weight of the motor and what it is capable of (power level). For instance, I have some small EDF 3000kv motors that would probably barely get this wing in the air, and then I have a 755W 3000kv motor which would turn this into a rocket. Do you have a specific motor in mind?

[@vanshsharma1303]

hey which propeller should i use .... 7x5????

[@UnlimitedVertical]

vansh Sharma It depends on the motor. You can go bigger than 7x5 with the motor listed (even 9x6 should be no problem). If you're using something more like a 2826 2200kv then a 7x5 would be good.

[@mELTINGsKYsTUDIOS]

What kind of tape is that, and where did you get it?

[@UnlimitedVertical]

It's packing tape. I got mine from fast-pack.com, other people use tape brothers or uline.

[@mELTINGsKYsTUDIOS]

Thanks man! Im about to build my first wings (Ive built quads in the past) Im pretty excited.

[@luispereira14]

where can i find the plans

[@lmrangeljr]

6:12, "winging it here" Ha! But, good video

[@Mar1wan1]

Whats thw max size battery it can carry?

[@UnlimitedVertical]

I haven't specifically tested, but it floats very nicely even weighted down with the ContourHD and a 2200mAh battery. If you went for a lighter camera I'm sure it would easily take 5000mAh of battery or more. That's a good idea though, I should do some dead weight flight tests just to see how much these things can carry and still fly reasonably well. It's a good excuse for me to build another one without all the FPV gear on it for testing :-)

[@MrSupersurinamer]

Every layer is 12.7mm or total ?

[@johnc7036]

Each layer is 12.7mm thick.

[@mariobradic8898]

Hi! Can I get your modified plans? :)

[@UnlimitedVertical]

Mario Bradic You mean the ones at the end of the video? That's all I have.

[@olivierlando]

Hi ! Could you tell me where is the CG ?

[@UnlimitedVertical]

According to the Flying Wing CG calculator 8.75 inches from the nose. Here is a link to this design (approx) fwcg.3dzone.dk/?wing_span=1062&root_chord=400&tip_chord=259&sweep_type=0&sweep=336&cg_pos=20&show_mac_lines=0

[@olivierlando]

UnlimitedVertical Ok thanks a lot. I'm building this wing currently. I recently tried to build the fpv40 but it flys like a rock. I surely made something wrong but I don't know what. I hope I'm going to get luckier with this one.

[@UnlimitedVertical]

Lando Olivier That's interesting. The FPV30's I build are a descendant of the FPV40 and they fly pretty well (in my opinion). Of course it all depends on what else you've put on them. If you put actual FPV gear like a gopro they can get quite heavy :-) On this wing FPV44 I've had a 2200mAh battery and a contour HD on the front end and it still flew very nicely. Good luck!

[@ryanfonseca3270]

What kind of tape is that?

[@UnlimitedVertical]

It's packing tape. Search for uline color coded packing tape or tape brothers colored carton sealing tape. There are probably a bunch of other good places to buy it too.

[@akmal_alfair]

the name of foam ?

[@UnlimitedVertical]

It's 1/2" dow cladmate. Extruded Polystyrene.

[@rchobbykhem]

Híiii