Almost lost the plane - twice - Page 2 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 07-08-2011, 11:50 AM   #11
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Re: Almost lost the plane - twice

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Originally Posted by Florin View Post
Hold on guys.
I understand now that flatbottom and dihedral won't help flying inverted and that's why the plane was loosing altitude when flying inverted, but that cannot cause the plane to spiral ot of control, right?
Do you mean that the spiraling was not cused by the stripe. Could the loose stripe be just a coincidence and if I do a fast dive again I might run into trouble again?
Originally Posted by pipercub17 View Post
hi speed stall! for sure it happens all the time with my trainer when i fly it inverted
Originally Posted by Pauld View Post
It looks like your airframe is a trainer which likely means a flatbottom wing which is designed to provide a forgiving, highlift airfoil when the plane is upright - but not inverted. My guess is you managed to put the inverted wing into a "high speed stall". Doubt it has anything to do with the electronics, servos, etc.

You sound like you're ready for something more aerobatic with a symetrical air foil....

Hi-speed stall? Rubbish!

What you have here is classic ""Loss of lift" on one wing due to the interference of the airflow over the wing. This interference was caused by the loose red trim tape, which when fluttering over the airfoil, caused that wing to lose some or all of its lift generating capability.

This VERY EASILY explains the spiraling. Any plane flying straight and level has an equal amount of lift being generated by BOTH wings. If you increase the lift on one side and reduce the lift on the other (which is what the ailerons do) then the plane banks over. The fluttering trim had the same effect. By killing the lift on one side of the wing, the asymmetrical lift caused by the imbalanced lift capacity and caused the plane to bank over. The "Spiral" was probably caused by the pilot Florin giving "UP" elevator in a desperate attempt to save his plane.

As for WHEN the trim flutter occurred, it depended on the nature of the material, its thickness and position on the airfoil. It just so happened to be in such a position that when the plane was at the right angle of attack and velocity that it would start to flutter. Being a degenerative problem,(left to its own devices, the amount of "loose" trim would gradually increase, changing its resonant frequency) So at first it happened at high speed and high angle of attack. Later on, as the trim continued to loosen, it could very well have happened even in level flight.

Solution: Pull off the Trim (or re-stick it down if you dare) and fly like nothing's happened. I'll bet you can do all the inverted high-speed dives and it will never happen again as long as the airfoil stays "clean"
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Last edited by Max; 07-08-2011 at 11:57 AM. Reason: spelling mistakes
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