High Speed Stall - RCCanada - Canada Radio Controlled Hobby Forum
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Scale Aerobatics Scale Aerobatics/IMAC in Canada

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Old 09-16-2003, 04:34 PM   #1
Kevin McGrath
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High Speed Stall

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It seems to me that this scary occurence is constantly lurking in the shadows to strike typical semi scale models used for IMAC purposes.
In laymen,s terms what causes this type of stall (Im referring to an unwanted snap out of the downside of a loop for example),what is actually happening,and what affect does CG location have on this tendancy.?Also what about wing loading?

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Old 09-16-2003, 05:22 PM   #2
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Bring the cg forward
put less elevator throw in
Curtis Moar
Scale Aerobatics
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Old 09-16-2003, 05:31 PM   #3
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I have had two planes that experience this. The Ohio Extra that I was flying at the IMAC in London will snap out if (and only if) you apply too much elevator too fast. My cure is to get comfortable with how much elevator to apply and make sure I power up first before I pull back on the stick (like at the bottom of a down line).

Why does it happen? I dont know for sure but I know the higher the wing loading (relative to the size of the plane) the more subceptible to snapping out the plane is. ALso, a tapered wing will exhibit this more so than a straight (contstant chord) wing, and what makes an aerobatic plane more aerobatic (tapered wings make snapping manouvers easier due to the even stall pattern along the length of the wing) also will make a heavier wing loaded plane easier to snap at the less than opportune times.
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Old 09-16-2003, 07:57 PM   #4
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hi speed stall

high speed stall is misnomer;

can happen to any aircraft at any speed.

when G force weight is more than wing lift generated..high speed stall.

faster aircraft moves..more violent re-action.

trust me...dont lay a b727 on its side at 350 nts and pull the wheel into your stomach.
doug lachance
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