Glider tip stalls
01-02-2006, 09:29 AM
#1
Senior Member
Thread Starter
Glider tip stalls
Glider tip stalls
My T-tail glider appears to tip stall abruptly when the engine quits. It has a pusher engine mounted behind and above the wing. I sense the engine thrust angle is incorrect. I have been unable to get enough flight time between repairs to experiment. Guidance on the direction the engine thrust line should go to correct the problem would be appreciated.
Bill
My T-tail glider appears to tip stall abruptly when the engine quits. It has a pusher engine mounted behind and above the wing. I sense the engine thrust angle is incorrect. I have been unable to get enough flight time between repairs to experiment. Guidance on the direction the engine thrust line should go to correct the problem would be appreciated.
Bill
01-02-2006, 01:57 PM
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Location: Chilliwack, BC, CANADA
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RE: Glider tip stalls
Tip stalling has little to do with the engine run. Or do you mean that when the engine cuts that the model is left hanging nose up and stalls? If so how high is it when this happens?
Some more info would help. Assuming it is high when the engine cuts why can't you recover into normal flight? Is it going into an unrecoverable spiral dive or spin?
It sure sounds like you've got more than one problem here or that the real problem has little to do with the engine thrust.
What model is it and is it balanced as per the plan? Did you fit the power pod onto the model and neglect to reset the balance point?
Some more info would help. Assuming it is high when the engine cuts why can't you recover into normal flight? Is it going into an unrecoverable spiral dive or spin?
It sure sounds like you've got more than one problem here or that the real problem has little to do with the engine thrust.
What model is it and is it balanced as per the plan? Did you fit the power pod onto the model and neglect to reset the balance point?
01-03-2006, 07:06 AM
#3
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Thread Starter
RE: Glider tip stalls
Yep something is fundamentally wrong. Just don’t know what. The model is an Aerofly t-tail slope glider. It was balanced with engine but I will recheck the balance. I don’t think something as obvious as balance would be missed but anything is possible. The engine has shut down at less than 20 feet each time and it appeared to snap abruptly without sufficient altitude for recovery. If I ever get enough height to experiment working out the kinks should be easy.
Your comments have helped. I will recheck the balance. Undoubtedly air bubbles are shutting the engine down. During testing I will throttle back gradually hoping the transition from power to glide will be less abrupt.
Bill
Your comments have helped. I will recheck the balance. Undoubtedly air bubbles are shutting the engine down. During testing I will throttle back gradually hoping the transition from power to glide will be less abrupt.
Bill
01-03-2006, 01:36 PM
#4
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RE: Glider tip stalls
The Aerofly came up in another thread a while back. The consensus was that it is a heavy bird that is prone to tip stalling and probably needs some washout added to the wingtips. You may want to look into that. Was the older thread your's as well?
