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RE: Hanger 9 Extra 260 27% Crash.... - 8/16/2006 7:53 PM   
Silvanskii



Posts: 783
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From: Piqua, OH, USA
Status: offline 		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.

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RE: Hanger 9 Extra 260 27% Crash.... - 8/16/2006 9:34 PM   
Dangerous Dan



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From: gainesville, TX, USA
Status: offline 		Hitec does not recomend Karbonite geared servos for large scale aerobatic gas planes



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RE: Hanger 9 Extra 260 27% Crash.... - 8/20/2006 5:18 PM   
gadix


 

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From: Modi'In, ISRAEL
Status: offline 		wellcome to the club
please take a number and be seated patiently



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RE: Hanger 9 Extra 260 27% Crash.... - 8/22/2006 5:22 AM   
wttiger42


 

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From: Addis, LA, USA
Status: offline 		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.

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RE: Hanger 9 Extra 260 27% Crash.... - 8/22/2006 6:09 PM   
shag555


 

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From: Berlin Center, OH, USA
Status: offline 		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

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RE: Hanger 9 Extra 260 27% Crash.... - 8/23/2006 10:22 AM   
gadix


 

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From: Modi'In, ISRAEL
Status: offline 		well guys
u will be surprised...
the engine have a 100$ parts cost...thats it!!!
the plane is total lost....but i already got a new one..
all reset elect and accessories are OK.

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RE: Hanger 9 Extra 260 27% Crash.... - 8/23/2006 10:26 AM   
gadix


 

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From: Modi'In, ISRAEL
Status: offline 		my new edge540 85"

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       Post #: 82

RE: Hanger 9 Extra 260 27% Crash.... - 8/24/2006 2:22 PM   
shag555


 

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From: Berlin Center, OH, USA
Status: offline 		What did you replace on that DA - New cylinder or crank???

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       Post #: 83

RE: Hanger 9 Extra 260 27% Crash.... - 8/29/2006 2:00 AM   
rangerstl


 

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From: Saint Louis, MO, USA
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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

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RE: Hanger 9 Extra 260 27% Crash.... - 4/8/2012 1:32 AM   
flycatch


 

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From: Barstow, CA, USA
Status: online 		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.

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RE: Hanger 9 Extra 260 27% Crash.... - 4/10/2012 12:28 AM   
WaffleMan



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quote:

ORIGINAL: shag555

The sun got this one. The "new replacement" is almost finished. As always, lighter and more powerful!

MPB


That's not gonna buff out....

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