Stall Strips
06-16-2003, 07:17 PM
#1
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Stall Strips
I have a Lanier Edge 540 (1.20 size), The plane has a high wing loading, which means I also have a high stall speed. I've seen them on full scale aircraft, but has anyone tried Stall Strips on a model to decrease stall speed. This plane lands like a brick coming out of the sky.
Thanks
Harry
Thanks
Harry
06-16-2003, 07:29 PM
#2
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Stall Strips
It will come down like a heavier brick with "stall strips". These are NOT an aid to reducing stall speed!
Full scales use them as an audible warning to the pilot that he is approaching a stall.
Useless for that purpose on a model.
Keep the speed up.
Full scales use them as an audible warning to the pilot that he is approaching a stall.
Useless for that purpose on a model.
Keep the speed up.
06-16-2003, 07:33 PM
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Stall Strips
Stall strips increase the stall speed. They are used (usually on tapered wings) to create turbulence on the leading edge and cause the wing root to stall before the tips do, thereby maintaining aileron control in the stall.
Tall Paul - You are thinking of stall warning indicators which are designed to trip before reaching critical angle of attack.
Tall Paul - You are thinking of stall warning indicators which are designed to trip before reaching critical angle of attack.
06-16-2003, 11:00 PM
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Stall Strips
Originally posted by mjd3
Stall strips increase the stall speed. They are used (usually on tapered wings) to create turbulence on the leading edge and cause the wing root to stall before the tips do, thereby maintaining aileron control in the stall.
Tall Paul - You are thinking of stall warning indicators which are designed to trip before reaching critical angle of attack.
Stall strips increase the stall speed. They are used (usually on tapered wings) to create turbulence on the leading edge and cause the wing root to stall before the tips do, thereby maintaining aileron control in the stall.
Tall Paul - You are thinking of stall warning indicators which are designed to trip before reaching critical angle of attack.
No I'm not!
06-16-2003, 11:31 PM
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Stall Strips
You can raise both ailerons very slightly which will allow you to reach a higher angle of attack without stalling the tips. But this is risky business and may provide only marginal results. Another drawback is that it will create tip stalls when you go to negative G's.
By the way, stall strips are designed to cause the inboard part of the wing to stall first. FAA regulations require an artificial stall warning to be installed if the natural stall warning of the wing is not severe enough or early enough to meet certification requirements. This is normally done electronically or mechanically. The manufacturer does not want to sacrifice lift by aerodynamically creating a pre-stall warning. I know, because I've flown hundreds of full scale test flights in dozens of types of aircraft from sailplanes to Boeing transport category aircraft.
Hope this helps.
By the way, stall strips are designed to cause the inboard part of the wing to stall first. FAA regulations require an artificial stall warning to be installed if the natural stall warning of the wing is not severe enough or early enough to meet certification requirements. This is normally done electronically or mechanically. The manufacturer does not want to sacrifice lift by aerodynamically creating a pre-stall warning. I know, because I've flown hundreds of full scale test flights in dozens of types of aircraft from sailplanes to Boeing transport category aircraft.
Hope this helps.
06-17-2003, 09:33 AM
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Stall Strips
Have you considered making the plane less heavy ?
this can often be done by drilling out some wood (circles like in wing ribs) is the fuselage sides & bottom. Are the stab & fin & rudder & elevator build-up or are they complete wood ? dril holes in them then!
Also, consider the use of lighter servo's, bat pack, receiver....
the lighter the plane, the lower stall speed you will have...
this can often be done by drilling out some wood (circles like in wing ribs) is the fuselage sides & bottom. Are the stab & fin & rudder & elevator build-up or are they complete wood ? dril holes in them then!
Also, consider the use of lighter servo's, bat pack, receiver....
the lighter the plane, the lower stall speed you will have...
