P-51 with an atitude - RCCanada - Canada Radio Controlled Hobby Forum
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Old 06-28-2007, 08:56 PM   #1
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P-51 with an atitude

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If anyone has some advice for me it would be great.
I have a hanger 9 P-51 mustang pts that i built this spring. I flew it 6 or 7 times then it went down into some trees. there wasnt much damage so i fixed it up then today got it up in the air again. It flew great as usual, ran 2 tanks through it with no problem then on the 3rd flight i tried to do a loop and the plane would enter the loop fine, go altheway upside down then as it was coming down out of the loop the plane wold turn 90 deg.
with no transmiter input. I did it a few more times thinking it might be something i was doing but it acted the same every time then i could regain control after each time. Thinking possibly bad crystal or even reciever???

Thanks for your time

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Old 06-28-2007, 09:16 PM   #2
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What position was the elevator in when this happened? I am thinking that it might have been a mild wing tip stall. That would cause the plane to turn as one wing would be generating lift and the other in a stall, not generating lift.

I could be wrong, perhaps even way off. Its happened to me once before, only once though.
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Old 06-28-2007, 11:45 PM   #3
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the elevetor was in the full up as i was comeing down out of the loop and trying to return to level flight. The plane was always faceing nose to the ground and picking up speed then it would turnas if the ailerons wold glitch. When it would do that it seemed the elevator would returne to neutral even though i would still be holding back on it. It wold dive straight down for a ways then pull into level flight.

Its got me stumpt, i would hold the plane upside down and give it a shake but nothing happened. Ill have to go through the thing again.

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Old 06-29-2007, 05:02 AM   #4
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It sounds like a stall, if (when) it happens again, try easing off the elevator to see if you regain control, I suspect you probably will. At the top of a loop your airspeed is low and with full up elevator and the plane (probably) at full power, the prop blast is pushing the tail down (relative to the plane that is) forcing the wing into a stall. Because the wing is stalled, it feels like the elevator no longer works. After you pick up some speed on the downward part of the loop, the wing starts flying again and it comes out of the dive. Many planes will do this with too much elevator throw. Many will also drop a wing when this happens, as you have experienced. In fact, in aerobatic aircraft you want this to happen. Reduce the throw on the elevator a bit and the problem will go away.


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Old 06-29-2007, 06:02 AM   #5
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Back off on the elevator throw. It's a high speed snap or tipstall. Try going along at full throttle and pull full up elevator and I'll wager it will snap too. Another way is to do consecutive large loops. Gradually pull each loop a little tighter. When you get to a certain size, you'll find it will snap again. Say it snaps at 3/4 elevator. Land and give it 3/4 stick now you know the limit of throw. Set full throw a bit less than that throw and you'll be safe. Balance the plane laterally as a heavy wing can cause this too, under high G forces.
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Old 06-29-2007, 10:19 AM   #6
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your probably right. I don't have enough experience to know for sure but the plane also turns the direction the torc of the engine would be pulling. so when it stalls it is probably affected by that at that time.
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Old 07-04-2007, 03:12 PM   #7
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The radio link that most often acts up is the one between our thumb and our brain.
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Old 07-25-2007, 08:45 AM   #8
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My friend "had" one. Did something about the same. Check to ensure your aileron servos are secured in place. Just a thought!

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Old 07-25-2007, 08:47 AM   #9
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What's the CG location?

A rearward CG will result in this behaviour....
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Si fractum non sit, noli id reficere - (If it ain't broke, don't fix it).
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Old 08-17-2007, 10:48 AM   #10
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I had a Great Planes Super decathlon...it would snap out of steep turns and tight loops just as you described. The solution was a touch of weight in the nose and a bit less throw on the elevator.
Remember a wing will stall AT ANY SPEED. a stall is a product of AOA not speed. if you can get the tail to push the angle of attack over about 14 deg. it will stall.
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