Hanger 9 Extra 260 27% Crash....
08-16-2006, 10:53 AM
#76
RE: Hanger 9 Extra 260 27% Crash....
Interesting. I had the new Karbonite geared Hitec destroy my 4 year old 35% Troy Built last year. ALL the gears stripped out of both ailerons when they started to flutter in normal cruise flight. The wings followed soon after.
Yea, no more super duper Karbonite for me.
Yea, no more super duper Karbonite for me.
08-21-2006, 08:22 PM
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RE: Hanger 9 Extra 260 27% Crash....
HOLY HELL, Gadix,....thats the worst ive seen.
Was that plane a total loss? Did you get to save some servos or something?
I feel for ya man.
Was that plane a total loss? Did you get to save some servos or something?
I feel for ya man.
08-22-2006, 09:09 AM
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RE: Hanger 9 Extra 260 27% Crash....
Gadix - I got my 2nd Extra almost finished... Installed engine and put prop on - discovered that the crank was bent. Looks like that DA was a total loss??? Sorry bout that... **it happens, that's for sure.
My wings and tail feathers came out ok... Was thinking of re-building, now I've gotten the idea to build a profile out of it. Doesn't look like you're as lucky.
MPB
My wings and tail feathers came out ok... Was thinking of re-building, now I've gotten the idea to build a profile out of it. Doesn't look like you're as lucky.
MPB
08-28-2006, 05:00 PM
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RE: Hanger 9 Extra 260 27% Crash....
Saw a lot of talk about flutter. Flutter is an aeroelastic phenomenon... related to the dynamic interaction between the wing's center of mass and torsional center. Imagine a wing with the center of mass behind the torsional center, or axis of torsional deflection. If you whip the wing up (like vibration will), the center of mass, being behind the torsional center, will tend to resist the motion and cause the wing to TWIST leading edge up. This increases the wing's angle of attack, increasing lift, and tends to force the vibration to continue. This can happen to a wing without control surfaces just due to the inherent flexibility of a structure.
Now, if you take a wing with unbalanced ailerons and vibrate it up and down, the aileron's mass will RESIST this motion causing down and up deflection. This causes the same trouble as the twisting wing. Whip the wing up, aileron goes down, lift increases, vibration is forced to continue.
A big cause of premature flutter can be the hinge gaps allowing air leakage and turbulent flow over control sufaces causing them to bounce. Then as they bounce they cause the wing to twist, initiating flutter at a lower airspeed than one expects.
Real airplanes have flutter problems, it all has to do with the flexibility of aerodynamic structures. Our ARF models, being balsa and built to be cheap (less material), tend to have bad flutter tendencies.
N
04-07-2012, 04:32 PM
#85
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RE: Hanger 9 Extra 260 27% Crash....
Your the only poster who has given the correct answer. Airspeed goes both ways either it will save you or destroy you. Too many proficient pilots exceed the limits of the airframe they are flying. I watched a 3D pilot almost destroy anothers plane because he flew it like his own. The plane in question was of much larger scale than the one he was accustomed to flying.
04-09-2012, 03:28 PM
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RE: Hanger 9 Extra 260 27% Crash....
ORIGINAL: shag555
The sun got this one. The "new replacement" is almost finished. As always, lighter and more powerful!
MPB
The sun got this one. The "new replacement" is almost finished. As always, lighter and more powerful!
MPB
