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Old Oct 21, 2011, 04:49 PM
JMF11 is offline
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problem with electric glider flight after a crash

Dear all,

I'm looking for some help. I come back to RC models afte 20 years of non practice and my analysis skills are now very smooth. I Crashed my Kinetic 800 some weeks ago (lost one wing during the flight). I repaired it. It flies again, but it seems much more difficult to fly than before:
- it needs a lot of trim (seems more thqn before) on the elevator to suppress stall,
- when you push the throttle, then the plane immediately goes up, almost starting a loop when with full throttle.

But the CG is OK, and the front of the plane does not seems damaged.

What to look for ? What could cause this ?

Regards,

JMF
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Old Oct 21, 2011, 08:05 PM
AC5FF is offline
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just a couple ideas...
Incidence problem? The third photo looks like the stab is a little off from the main wing, but almost opposite of what you are describing...
You said the front of the plane wasn't damaged - but again the photos seem to show the nose pointed upwards which would explain this...

I'm not familiar with the model here - but just a few ideas I had..
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Old Oct 22, 2011, 01:57 AM
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Quote:
Originally Posted by AC5FF View Post
just a couple ideas...
Incidence problem? The third photo looks like the stab is a little off from the main wing, but almost opposite of what you are describing...
You said the front of the plane wasn't damaged - but again the photos seem to show the nose pointed upwards which would explain this...

I'm not familiar with the model here - but just a few ideas I had..
I was thinking the same. The leading edge of the horz stab looks to be high which would cause you to need up trim for level flight.

The top of the fuse just behind the motor mount looks a little scrunched changing the thrust line (up) which would cause the plane to climb when you apply throttle.

It's a little hard to tell from just pictures, but these might be a few things to consider taking a closer look at.

Bill
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Old Oct 22, 2011, 12:22 PM
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Thanks for your advices. I see that both of you see the nose of the plane pointing too high. I have to investigate this further. I may have to remove the red plastic piece, to see how is the foam behind it.

I'll post the result.

Thanks again,

JMF
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Old Oct 22, 2011, 12:31 PM
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Second photo, is that just wrinkles in the decal or has the nose been 'crumpeled' at some point?

Yea double check the firewall, I had one crack but it kind of set in place throwing the thrust angle all wonky. You couldent tell by glancing at it. The next flight was exciting.
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