Latency in RC systems explained

[@Ninjafluff]

Hey bruce. Just wondering when you are going to do the latency videos for the radio line up. Keep up the great work.

[@wb8ujb]

Bruce, I am always amazed at how well you explain things. Never boring and always entertaining with your point of view. Good work ... from Prescott, MI USA

[@Arthur_C]

Bruce! Excellent explanation! Really nice that you've put the latency in perspective as to how important it really is, or not is! Good luck on the House Relocation Project!

[@jof1953]

Excellent video Bruce -as usual- clear, insightful and practical with a dash of humour . Can you please tell what model your oscilloscope is and roughly and where you got it?.

[@3DBlockBuster]

Bruce, its been a long wait for servos reviews ~3-4 years it feels like, I'm glad to see that you going to to the test of it altogether along the radios, just can't wait for it, you such a teaser. ;)

[@jviss07]

So where is the part where you show the signals on the scope?

[@digigarb]

Thanks Bruce for explaining so clearly something I never thought about before.

[@FPVREVIEWS]

I'm currently struggling with a latency issue with a taranis, EZUHF module, and a pixhawk 2.1 cube. Setup for PPM mixed on EZUHF 8ch diversity RX, when i plug it in the RX with single cable PPM muxed to the rc in on the pixhawk, the servos are much slower than if plugged into the RX directly. Not sure if is the EZUHF or the Pixhawk 2.1, had the same issue with the PX4, lived with it, but trying to figure it out if i can.. any suggestions, anyone? it's a large plane, and can be flow either way, but does have a much nicer feel with direct control, also servos move slightly further when plugged in direct..

[@BKD70]

Great video Bruce! I especially enjoy the "how does it work" type videos. Keep up the great work! And, Keep the faith!!

[@sloperdude]

A standard servo motor has an armature. You can look that up, but it's a bunch of thin steel plates that are stacked together, and which the motor windings are wrapped around. As with any brushed motor, the armature and windings spin. (A brushless outrunner also has an armature, but the magnets spin instead.) In a coreless motor there is no armature, only windings that are glued to the motor shaft. There's less inertia in this arrangement, and less eddy losses too.

[@fuba44]

Great video testing the latency! A suggestion.. Maybe hook up one probe from your oscilloscope to the switch on the transmitter, and one one the output on the receiver, then single shoot the two signals and accurately measure the time between them.

[@Arunabha42]

When you talk about the pulse, are you talking of the difference between PPM and PWM, or something else? Could you do a video on the difference between pwm and ppm, also the various 2.4 fhss fasst etc that's used? Very informational :)

[@PagesFlyingCircus]

Good explanation Bruce. It would be interesting to see slow motion of the different servos moving simultaneously side by side. Also would be interesting to see them triggered with a switch rather than the stick - to take the transit time of the gimbal out of the equation. As always -- Well done.

[@TheMrTape]

Waiting patiently for the latency comparison! Your videos are much appreciated, informative and entertaining. Thanks a lot for doing them! :)

[@TheScottsawesomeart]

Bruce... is the latency affected when you have mixing involved? like in a flying wing. Thanks for sharing your knowledge bruce!

[@Troy707]

Bruce. You're the best !! Thanks for all your hard work. Can't wait to see what's next.

[@one4stevo]

Bruce would you consider doing a review on the E-Flite Apprentice S 15e.

[@capacityplus]

Great explanation. I have a friend who is new to RC model cars. This will be very educational.

[@jamesceastep8874]

Though this video was published a long time ago, I would like to voice the need for a fact-based commentary/training video addressing latency in 5.8ghz video systems. What is the best low tech way to measure video latency, what are the typical mistakes made, and what numbers make sense for different flying environments (multirotor free style, racing, fixed wing, etc.). Thanks. Jim

[@EURIPODES]

kzbin.info/www/bejne/mmjKZptthbp2gac

[@N0FPV]

Is part 2 still coming? I have had some discussions recently that would benefit from your testing!

[@GadgetMart]

Bruce I've been reading the Taranis latency is poor, twice that of Spektrum for example?

[@MrJkirk3436]

Hey Bruce, I had always assumed that regardless of the setup (internal or external) there was still a PWM signal that traveled on a wire between the radio's main CPU and a smaller CPU that drives the RF chip which sends the radio signal. So, the fact that the transmitter module is external should make no difference from a latency perspective. If however an "internal setup" uses the main CPU to "directly drive" the RF Chip, then no PWM connection is necessary... and I stand corrected...

[@NI0X85]

I would really like to see Part 2 :)

[@rocky173612]

I have a question, I own a brushless 4wd ecx ruckus that lags a bit with my new 2s lipo the voltage on the stock nimh is 8.4v and the 2s is obviously 7.4v does the voltage output into tha car change the latency of the car or is it something else? Plze answer

[@Glofilter]

Bruce, thanks for the video. I have a question. I use a FrSky module in my Futaba 9C for two airplanes and I like it a lot. On my remaining airplanes I use my JR 11X and Spektrum/JR recievers. Because the new FrSky radio allows you to put a JR module in the back, I was thinking about selling my 11X (for big bucks) so I could fly all my airplanes with one radio and then take the wife to dinner on the extra cash. But with PPM latency, how much will my old models suffer? Thanks.

[@FPVREVIEWS]

can't believe the negative comments.... THANK YOU BRUCE-EXCELLENT JOB!

[@MitchelCunnings1]

How come the throttle stick is located on the other side of the controller? In Sweden its throttle to the left and rudders to the right. Is it to counter balance the fact that you are upsidedown?

[@davidmitchell988]

Great stuff Bruce,love the info keep it coming All the best David.

[@analog56x]

i love watching your videos! always learn tons! cant wait to see more Bruce, keep it up!

[@warmfreeze]

Can you show and explain the difference between a cored and a coreless servo?

[@continental_drift]

Loved the tyre at the end.

[@carkeeks]

when testing the servos, i would be interested in the servo returning consistently back to the neutral point repeatably. To me the speed and no double neutrals are most important so long as the gears hold up and don't get sloppy. i am always searching for a brand that is as good as the super expensive ones without the name . :)

[@IbnAir23]

Bruce could you tell me if the video is posted from when Blacksheep and those guys came to your town to do some FPV? if so what's the name of the video? Thanks Bro.

[@tr4nscend]

Hey Bruce, my friend and I were concerned for your move. Good to know it is under way. Hope the rest goes well. Don't worry about videos. Take care of yourself first!

[@RockyMountainRc]

Hey Bruce I have a question... Radio signals travel at the speed of sound right? So in theory the farther away you are from the receiver the more lag it will have?

[@DiscosDead]

Welcome back, Bruce! Hope all is well. I fear I have a number of high-latency people in my life...

[@MrBer43]

Bruce, Enjoy you're Videos as they are always intresting. Keep up the good Work and Say HI to Barry.

[@FPVmarko]

Good explanation my friend! I didn't know that stuff before. Been in RC 2 years.

[@bluegrassengineer]

Thanks, Bruce. All your videos are great. As a newbie to the hobby, some of the terminology still befuddles me. What is meant by 3D flying? Isn't all flying 3D?

[@cloudninefpv]

Awesome bruce Love the slow mo at the end of the vid.

[@UPINTHEAIRNZ]

hey bruce are you doing the fpv transmitter.if not let me know so i can order a new one from hk.

[@sloperdude]

Bruce, your slow motion video of the servo moving would have been more accurate had you used a switch to move the servo 60 degrees, rather than moving the sticks, because it takes longer to move the stick from one extreme to another than it does to flip a switch.

[@BKD70]

Yes. Find a Futaba 9C flyer with a model with dual elevator servos, and you will be able to see the effects quite clearly. Since the first elevator half is channel 2, and the second elevator half is channel 8 (if I remember correctly) it takes a bit of time for the electronics to decode the stick inputs, then position elevator 1, then channel 3, 4, 5, 6, 7, and then finally channel 8. It is noticeable. In flight though, as Bruce said in the video, not really a big deal. the brain compensates.

[@TignMeg]

Much as I like ALL your videos, the time between these BRILLIANT instructional videos is too long Bruce. See if you can work on that one mate.

[@michael919sa]

Love your Work like always ! Cant wait for next video's ......... Oh and hope your house moving is going ok !

[@kmatusik73]

why haven't you flashed that 9x to open tx? seams with your insight, you could put a new twist on it.

[@alvins1982]

Goodluck with move buddy. Would be awesome if you also did LRS latency test such as EzUHF.

[@ForboGrC]

How is the Aurora 9 on latency.... any other transmitter that u recomend??? ( up too 300$€£ )

[@65mustanglover2]

Thanks for showing that bit at the end. I was slapped up side my head by my trainer for letting that happen. Now I see what it does to the servo. Can you send me some Marmite? All I can get here in the States is the better than nothing stuff form England!

[@amtpdb1]

Thanks Bruce. I can't wait for the next video!

[@silentrac]

What frame rate does your sony use for the slo-mo stuff

[@HaraldKubota]

Looking forward for the next latency video!

[@thezeekap]

Bruce, you do an awesome job! Keep it up!!

[@Rchacker]

Taranis in the last shot?, wow. Looking forward to the tests. Any digital protocol besides PWM between the main MCU and TX MCU is going to make a big difference. Not sure if FrSky PXX is pure digital, it certainly looks faster. Big plus is that it is open source. My bet is that openLRSng will be the next to become PXX compatible.

[@123bekie123]

Hey Bruce i know people say this all the time but i just wanted to say you do alot of sneak peaks and there great :) but i havent seen any of them followed through to a review or anything. I know its probably because MFNZ are probably on your case or somthing but could you keep us in the light please? Thanks :)

[@Sickxer]

Bruce, no one does it like you do mate! :)

[@thehappyapplecrew]

What about distance? How does that affect latency?

[@g0fvt]

Great video, latency is terribly misunderstood, measurements would be interesting.

[@VictoryGuitarShop]

Keep these great videos coming!

[@alexecheverria]

I read SONY manual PDF and it does not say. I assume 200 frames per second at most.

[@ALTN8NRG]

Thanks for making these informative videos!

[@machinedred]

Latency increases with distance on digital so I've noticed some get really bad 😞

[@philg6757]

Thanks Bruce.

[@BladeScraper]

Thanks I always wondered. When he was talking about the camera: "why don't they give them decent names like frito bob"

[@i0.0t]

Awesome! Thanks Bruce!

[@LWJCarroll]

I am sure they travel at the speed of light...radio waves are just part of the light spectrum..as I understand it...Rgds....Laurie But the further away then there is a time lag of course...just really tiny as Bruce mentioned..

[@BKD70]

And, still waiting for that Aurora 9 conclusion too ;-)

[@kperalta1701]

Keep up the GREAT work!!

[@206LaKi]

Bruce, why don't you invite some young local modelers to help you with all these time consuming projects, builds, filming, editing... They could learn a lot by helping you, and videos would easily come out frequently on a daily basis. Keep up the great work. :D

[@oscar7771]

and the toilet is going on the wrong direction too? I love you videos :)

[@samselectronic4548]

great job.

[@Hurleyshobbies]

I live in sand lake,Mi. USA About 15 miles or so.

[@lowcee89]

The most important part for me is: 9X with FrSky DJT vs native FrSky Taranis

[@123bekie123]

Im local ish, I live just south of Hamilton and i would love to come help you i'm a big fan. :D

[@Xairflyer]

Bruce your throttle is on the wrong side, works faster on the left :-)

[@Kobei]

Hey Bruce!

[@cuddles6938]

Sony cam looks nice but I wouldn't need the Projector feature built into it. $1200 USD here in the USA awful expensive. Wish I could get freebies, haha.

[@warmfreeze]

i know what standard servos look like inside ..i rebuild servos all the time just a bunch of fiddly bits in a plastic housing though :P

[@moq34]

👍🏼

[@pbutok]

Next vid!!!

[@jeffie8696]

A servo test, you promise?

[@SianaGearz]

Aaaaand the promised follow-up?

[@jakeb92980]

LOL at 4:46. Always entertaining!

[@cod4madass]

Best comment i have seen in months

[@1974charrua]

My Left thumb is so unco I don't even use the rudder. Mode 2 for me ,That makes me young !!!! But wow, a hole country flying mode 2 ....That's trippy .:-/

[@OfficialCytation]

Stop making fun of us mode one users... . Mode 1... UNITE!!!!!!!!

[@neoconker]

Bruce. When I saw the Turnigy 9x maybe you and your lovely spectrometer can help with the 9X interference? Check this video watch?v=C9Cqti3-i54

[@sloperdude]

See Wikipedia: coreless motor for more info.

[@lionelfrenchface]

"Taking home a bag of hurt" lol

[@TignMeg]

You misinterpreted my comment as a criticism. It was meant as encouragement not criticism. I am as aware of Bruce's difficulties as much as any viewer.

[@gordonseifert7442]

Bruce, since you have done little other than cover quads and FPV for the last couple of years and apparently are never going to do the promised follows up to videos like this, the Taranis review, the Aurora review or anything other than FPV and Quads, I have decided to un-subscribe. Your tech reviews and articles used to be great sources of information for all RC hobbyists, but now your are far too focused on those ugly, annoying multi rotors. I know a lot of this is due to having your wings taken away, and I am sorry you lost them, but I am afraid it is your own fault. You just can't run around thumbing your nose and laughing at everyone who controls those things and doesn't see things the same way you do without suffering the consequences.

[@MrStevegibb]

+Gordon Seifert Oh shut up you idiot.

[@charmlt]

Too funny!

[@sandsifter149]

Please don't bother...All radio's re good enough to keep up wit the average Joe these days FFS

[@antoniobradiano]

you talk alot reshort it.