How to Find the CG of your RC Airplane

[Zoidborg1]

hey dave you ever build a Geobat

Crazy looking disk rc plane

[mgrande11]

Hey Dave, I've got a Great Planes Escapade and I'm trying to figure out if I should set up spoilerons or flaperons. I run a DX6i and I can only run one or the other at a time.

[ElRhinoProductions]

looky look at our bloggy blog through our linky link!

[TheLipRipp3r]

Dave,

Dave here! Another helpful video! Thanks and lookin forward to more projects, and flying videos!

[shangsandy87]

What's is he saying at 6:55? Can anyone tell me?

Some kind of a weird word

[shangsandy87]

6:53

[shangsandy87]

Though on paper? I have a hard time hearing that phrase. Please help me out!

[cambigfoot88]

What do i do for a balsa wood plane?

[diegoXm94]

Hey can you tell me which electronic materials i should buy for a new homemade airplane ,,like the extra 300 im trying to make it but ineed a list of material ss,,,such as servo ,, motor,ect , i dont know if it will fit or if it would be to heavy..HELP pls.

[frizstyler]

YOU and ANYONE ELSE should check out their website,where everything is explained with guides about all the issues for beginers(and yours ,of course),and stop making time-wasting and egocentric comments!

[historysky]

dave i need your help, my homemade plane turns and tilts to the left due to the tourque of the motor i think, how do i cancle that out? do i jus put sum weight on the right side??

[sod16]

no dont do that, thats a problem on real single motor planes (like world war 2 ones) even in real life, use google it should educate you on it, or on take off use your flaps to prevent you swaying.

[burt2800]

if it's a profile plane then you can put your battery pack on the other side of where the plane is rolling (in this case you put it on the right) that should help and you can trim the radio. RC powers have got a video about how to do that.

[byrumjr]

All the weight should be on the right side of the plane esc, battery, rx that should take care of it. If not used weights like you say.

[sabaqat]

in one of his videos he said you should intentionally angle the motor slightly down and right to counteract the motor's torque. he said to use a toothpick to shim it into that position. looking from the back of the plane you angle the motor down and right.

[LivingDog94]

I would like to design and build my own RC from scratch - deciding everything from the engine and the structural material to the shape of the wings and body.

I want to start simple - a prop plane with one wing just to learn the basics of design. Then I will go up from there - probably design my own directed fan "jets".

I've looked for a site which could teach me how to build my own from scratch but find mostly "kit stes" - which usually talks only about lift and drag.

plz suggest links. thx!!

[ordi75]

Keith is so funny!:)

[annihil8ted]

hey dave how far can a cg be aft with a gyro?

[RCSuperPowers]

Oh good question! Depends on the plane like anything else, but we have gotten it pretty far back and it still held!

[airlinerdude12]

well, i have never heard of 2/3rds from the LE!!!???.

is this for aircraft with sweep???

[leviterande]

they mean 1/3 from the leading edge which means actually yes 2/3 but from the back edge

[RCSuperPowers]

Its a general thing, and depends on so many other factors. Most sure way is to test glide first if possible and then go nose heavy and work your way back.

[airlinerdude12]

its usually 1/3 of the wing if its rectangular.

[HangarX1]

Dave Powers VS Dave Herbert in the ultimate fly-off!!!

[jezcol]

i tryed to make it lighter but it did not work, could i make the tail smaller to make it go faster or would that make it worse or in my case can i take 2 tails off because i have 3 tails and just keep the center tail

[FREAK9364]

Haha Keith always points in the wrong direction

[jezcol]

hey Dave i want to know If you can make a rc plane go faster if you make it smaller or can it be done some other way with out getting a bigger motor

[linkadrip]

Just make it lighter. less weight the egine has to pull the faster it will go.

[TKDWolf]

That is technically true, power/weight ratio is more important than total amount of power.

But, making a plane too light can have negative side effects on stability and control, it'll be blown around a lot more by the wind and stuff.

[metalmikexx]

The latest Model Aviation magazine has an article that gives the mathematical way of determining CG.

[RCSuperPowers]

Yeah, those "work" ok but for really making the plane fly at the field is a little different.

[linkadrip]

I 'm curious too. And wondery why he doesnt fly Nitro powered or gas powered, i can kinda understand the gas reason since there a little more labor intensive. But i will take a wild guess and say one reason might be because you have to have a large open area to fly nitro & there more dangerous if ya hit someone with a foamy there not as likely to get hurt Severly.

[lpc98662]

yea me too?

[RCSuperPowers]

Yes, exactly, no place to fly those out here. None anyway that justify the tremendous amount of time and jerk-around to get to them any way.

[linkadrip]

Well that kinda makes sence. last part is a bit hard to comprehend. But i guess you mean there a pain in the but to get working right the enignes that is. But thanks for replying to the comment i would have never expected a comment back cause you get so many on your video i wouldnt have thought you would have had the time so thanks.. :)

[omendesign]

any plans for that lil white plane....make one rc

[icancrash2]

Dave----> Keep up the good work, love the info.

Redneck CG test-----> 1.Buy 30 pack. 2. Drink. 3. Hop in the bed of your, ..uh...sober...buddies truck. 4. "pretend" fly @ 20-25 mph. 5. repeat

note- DO NOT LET GO OF PLANE...OR BEER.

[omendesign]

hahahahahahahahahah.....SOUTHE­RN BY THE GRACE OF GOD

[hasty72]

Dave, you are going to have many suggestions from people. Do what you do best...so far, you've been doing great. Learn so much from your video. Thanks! From a RC beginner after visiting your website!

[RCSuperPowers]

Hey cool, thanks alot, good to hear!

[Krisrilee]

hey dave, why dont u try nitro planes???

uhh i mean nitro fuel planes lol

[RCSuperPowers]

We don't even have a place to fly the electric ones here, it would be impossible for us to try and do gas, we would spend all our time trying to drive hours for such a location.

[bobbyt2012]

These videos are so long. And Dave, it would be nice if you would have a different account for the business videos because they always stay in my subscription box. The test videos are cool though.

[RCSuperPowers]

Just unsubscribe and watch every Saturday then. In a month or so we will be going to 5 shows a week (M-F).

[HerraTohtori]

Finding center of gravity is kinda easy, just find the spot it balances on and that's it.

It's harder and more relevant to define the center of lift (or center of pressure), and that defines where exactly you should place the CoG. Center of pressure moves around based on control surfaces (elevators, canards, flaps and spoilers), but what you're after is matching the CoG with CoP with neutral control surfaces. When the plane is trimmed to fly straight, CoP is always at CoG due to control inputs.

[cbong3po]

hey dave and val its me dustin from tahoe the video look alot better noe and i love this video grat video keep ip up ;-)

[InderNett4tube]

Hihi, me not gyro, me Inder-Nett, me knowing why plane flys *LOL*

[MartySchrader]

You guys are a regular comedy troupe, you know that? Hah!

Dave, et al, you might want to address the differences between two and three cell packs and what impact they have on motor current versus prop size. I size almost everything for two cells, so I end up using stiffer props than I would for a three cell. It's a valid subject.

[FutureStudy]

stop talking and start flying planes again

[RCSuperPowers]

Yeah, thats evvvvvvery Saturday... Just watch the Saaaaaturday videos then.

[wildhover]

great info! hope this gives me more successfull test flights rather than the usual test crash

[moneybagz609]

hey dave could you make video on how you put the pushrods on the ailerons cause i dont get how you put it on so could you please post a video on the youtube page or your video blog page THANK YOU

[jasmine2501]

It depends on the plane. There's 100 different methods.

[moneybagz609]

i am making a extra 300 from Dave's free PDF plans and i want to do the aileron pushrods like Dave does it on his EPP extra 300 so thats why i needed a video. But thanks for replying.

[RCSuperPowers]

Yes, if you click on the blog link in the side bar and scroll down to the older videos we have some in there on that!

[thedanman55]

100 videos!!! congrats

[AVAMagneticlev]

Always great info and some fun humor.

Thanks

[rcboatkyle]

i am tring toput a camrea pod on my phoenix boomerang do you no wot this will do to the flight caricterristiks and wot i nead to do to canter the pod. and thanks for all your help

[twanna44]

what web sit is good to buy rc thing from

that keeps ur crade card or any thing elss info

save so no one steels it?

[2deluxe58]

oh very nice :)

[JoeFielding72]

Your video. Has made my night. I hope you all there have the best Friday night and I hope your weekend is full of the fun things you all love doing. God bless you all there and your families.

[RCSuperPowers]

Thanks so much Joe!

[scienceguy22]

Hey Dave. Here's another way to check CG in flight:

Do a shallow dive, high power:

-If it levels out, it is nose heavy,

-if it maintains downward angle, it is "neutral"

-If it tucks under (curves down to the ground), it is tail heavy.

1st do the 1/3 rule to get it approx. Then this flight test will allow one to "dial the plane in"!

[jasmine2501]

I think you got that backwards - tail heavy planes will pull up out of a dive.

[scienceguy22]

No, I've got it right jasmine,

Think about why a tail heavy plane might want to climb when it is being accelerated.

(remember, to compensate for being tail heavy in flight, there is some down elevator added, at high speed this becomes overcompensation)

Note:

Another useful indicator you're tail heavy, is your plane will climb while inverted (rather than diving)

[jasmine2501]

Oh ok, that would require that you've trimmed the plane to fly level already. I use the trimming guide from IMAC, which has the opposite advice.

[scienceguy22]

I see, the IMAC guide assumes neutral trim, and the flight test assumes the trim has already been corrected for level flight!

Try the flight test. It's a great way to confirm balance (by dive I meant 30 degrees or so, not straight down!)

[atvmaster281]

5/5

[Rueffilicious]

looky look at the linky link on the bloggy blog...

[mgrande11]

How about the cg balancing of warbirds that are low wing and do you check cg at wing root or wing tip

[vinzoli]

Thanks for the information. I like your videos.

[derfreak113]

Hey guys i just bought an kyosho 2000s, here is the probelm, everytime i charge the battery and not straight away ( in the range of one hour after charging) plug it into my plane the planes motor switches off wehen i go over half throttle....

[wilsonweed123]

linky link blogy blog..

[bholmes300]

hey, for your next show..can you talk about easy to make foam jets. I really like the jets that you make but i think they are too advanced for me. Are there some easier foam jet plans that you can show me. I really like the RC F-35 you have, is there a simplier set of plans that i could use to build it?

[RCSuperPowers]

Yes, click on the link in the side bar, go to our blog, and scroll down to the older videos and there is some videos in there on this!

[brenoribeiro2007]

What's Keith relationship to ATT. I noticed he uses shirts with their logo on the videos.

[j55862]

he works for them i think

[dragonmertstar]

Verry Interesting Dave!

:D

[sharksledge]

i liked the end!!!

[12WDH12]

how do u know what prop and motor u need to use when u build an plane???????

[zezimashock]

look on there video list,

there is one video where they explaine it :D

[12WDH12]

thnx man :D

[cmreel]

Center of Lift, Center of Gravity. The two have direct connection. CG will generally always be forward the CL. I am curious, in the tail heavy configurations, is the CG still forward of the CL.

[manhill]

what is that yeti for? ;)

[Mhworley]

Keith just looked like he wasn't having any fun...

None the less, a great video.

[tallguysd]

Dave once again great show!

[DG121480]

Great ending!!!

[AmpedRC]

Hey Dave 100 videos! Wahey well done!!

[Binome909]

Question for you - Where is the C/G on your Profile Thrust vectoring MIG29 - in your Instructions you say 2inch along the wing from the wing kink - but on RC Groups you say 18.5 Inch back from the nose - these are NOT the same infact they have a 2-3 Inch differance between them ???.. HELP.........

[RCSuperPowers]

Anywhere in between there is just fine. Go more nose heavy for more stability.

[B4its2L8guy]

What ever happened to the videos where they actually flew test designs? I learned more watching flight vids rather than listening to topics that go on and on about simple facts. You're stretched too thin, trying to get too many views off of not enough content. Seems like similar Jerk Chicken business plan to me. Too bad, I used to really enjoy watching your flying vids.

[x7cj87]

the flying videos are on saturday... This is part of the thursday beginners show. Wait for it, saturday is just around the corner.

[M0t0rBreath89]

He does these vids for ppl who are just starting flying.

[RCSuperPowers]

Yes, we have tried to say it a hundred times... those experimental videos are on every SATURDAY...

[RSAndiRs]

i want a plan from the lil depron plane

[MovieMorris]

the end was very professional :D

could you explain how gyros work, how to build them in and what purposes they can fit?

[subocito]

I think there is a video on that on their web page (but I'm not sure)

[tieInterceptor]

lol, the orange shirt guy seems like a random echo generator,

or in a rap song, he would be the guy saying, "damned right" once in a while.

:)

[Sharpshot234]

lol

[raouldin]

He's sits just there for fun :-P 'right right... yea... okay... hmhm yes. yea...'

[startazz]

Great video Dave/Val and Ron is it lol,5*

[speedstakerguy]

awsome vid :D i have one question...

Could Jesus fly?

[tenuki3]

Likely... but RC was not invented back then. :)

[0n3m1s1s0]

great vids mate :) can you tellme how to make detachable wings for transportation? 5*

[startazz]

Yeah,take them off then out them back on again LOL,just joking Dread.

[0n3m1s1s0]

funny **** aint ya? :D i mean the best way to make detachable wings that dont just fly off by themselves when they feel like it :D for people building from scratch btw not plans or shop bought ;)

[startazz]

come on Dread only playing with you man,i thought you knew what i'm like man,don't take it to hart i think we all know what you mean by way of the wings mate.

[0n3m1s1s0]

dont worry i did bruv :D read ya posts with a big grin on me face :)

[subocito]

Mabey you could do something similar to the wildhawk setup? I think they have a video where you can see it.

[0n3m1s1s0]

nice one mate i will go search some info on that now ;)

[anybodykilla58]

question. going out to some of the meets in my area, I've seen some people using actual jet engines on their RC planes, other then the obvious speed factor is there any benefit to going with a jet engine over electric (ducted fans or props)

[4emu4e]

super :)

[lovre666]

yay! first comment!!! keep it up!! nice video!!! :)