radio control DC3 crash

wrong C of G on maiden flight. it is being repaired and is about to take off again soon.

Category:

Autos & Vehicles

Tags:

• Airplane
• rc
• crash

[pete2778]

Interesting vid, you demonstrated a high speed stall, snapping into an incipient spin. Shortly before the crash, the model's diving & you can see that it's got plenty of airspeed so you reduce the forward pressure on the elevator and the model pitches up violently into a high speed stall. This is a useful demonstration that a wing stalls when the angle of the airflow being impinged upon it exceeds a critical limit. Stall isn't just a function of airspeed. Hope the repairs go well.

[rcmonster99]

@pete2778 Thanks for the explanation other than having dodgy thumbs

[rcmonster99]

I think the difficulty is the thin wing tips. the wing tips have less authority to prevent a tip stall. Even with a certain amount of washout the tips wont be strong enough to drive the rest of the wing. the same happens with planes like the mosquito.

[justlostagain]

Sorry to see that great looking model crash. Of course you will re-build and get the CG forward. Good luck and thanks for posting the vid for the rest of us to remind us to check CG carefully. (We all get complacent!) Don't worry bout the goofs who comment about your pilot skills, probably never even flown an Air Hog themselves.

Take care, GL with the re-maident.

[rcmonster99]

@justlostagain

Thanks for the kind words. I did have the re-maiden and it flew a few times, but very difficult. There was a wing warp that was too difficult to fix,

[lazyinaz]

CoG is the easiest test ever

[rcmonster99]

@lazyinaz yep and I thought I had it right but failed !!!

[maca15551]

Way to windy to fly

[darrindwp]

Low air speed = stall

Recovery then = over correction

[M2Eventworks]

@M2Eventworks And hey, great try! Don't let anyone give you shit.. I crashed a plane of mine recently due to high winds...

[M2Eventworks]

All this technical talk! Here's how you explain it to the average enthusiast... There is two problems here, the center of gravity needs to move more to the front and there was entirely too much wind to be flying that. It probably fly's like a dream when those two issues are resolved... YOu can tell there was gusty wind and you can hear it on the camera!

[bongose]

Is this a TOPFLITE kit? Is yes, could you tell me where you had the CG when it crashed? I'm building one and it's nearly finished... 

[Apocolypsenow1]

@pete2778 Make sense, thank you for your futher explanation.

[pete2778]

@zero00tolerance, sorry, I am an engineer and an amatuer full-sized pilot and model aircraft designer so I like to think I have an understanding of aerodynamics!

[zero00tolerance]

@pete2778 Im sorry i dont get that could you please explain your phrase please, my english is not as good. 

[pete2778]

@zero00tolerance. Thank you, I am the former and I like to think also the latter.

[pete2778]

@Apocolypsenow1. You are correct, the C of G was too far aft, this is why the model was unstable longitudinally & hence responded to the elevator rather too rapidly & effectively to be controllable. The rapid pitch changes were due to pilot induced oscillations (P.I.O.). The pitch up & wing drop ARE a high speed stall/incipient spin caused by an aft c of g. Correct, the root cause of the crash was obviously an aft C of G, the result of the aft C of G was a high speed stall, as I commented.