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#1
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Lowering Stall
Just for discussion, what opinions are there for an individual lowering the
stall speed of an existing wing considering constructability and cost? I remember there was some leading edge profile modification studies done years ago but can't see that as a practical approach for an individual. Thinking about how to add sailplane-type upper surface spoilers, WW2 fighters underwing dive brakes, etc. Dick |
#2
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Dick,
Spoilers on gliders kill lift and add drag, so it does really not lower the stall speed. A modified leading edge will, it can be made with a ad-on like it is made on Cessnas and others. One simple way to gain some is to seal the hinge line and the junktion between wing and fuselage. VG's = vortex generators is another way to go. Jan Carlsson www.jcpropellerdesign.com Just for discussion, what opinions are there for an individual lowering the stall speed of an existing wing considering constructability and cost? I remember there was some leading edge profile modification studies done years ago but can't see that as a practical approach for an individual. Thinking about how to add sailplane-type upper surface spoilers, WW2 fighters underwing dive brakes, etc. Dick |
#3
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"Dick" wrote in
m: Just for discussion, what opinions are there for an individual lowering the stall speed of an existing wing considering constructability and cost? I remember there was some leading edge profile modification studies done years ago but can't see that as a practical approach for an individual. Thinking about how to add sailplane-type upper surface spoilers, WW2 fighters underwing dive brakes, etc. Dick Are you wanting to slide your plane into the sport pilot rule perhaps??? -- ET "A common mistake people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools."---- Douglas Adams |
#4
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excellent guess. you're correct. I have two incomplete projects that might
be convertable to LSA (Light sport Aircraft) definition and use the Sport Pilot license upon losing my medical/PPL. |
#5
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"Dick" wrote in
om: excellent guess. you're correct. I have two incomplete projects that might be convertable to LSA (Light sport Aircraft) definition and use the Sport Pilot license upon losing my medical/PPL. I had a conversation with one of the folks a Jabiru, they have 1 airplane that becomes 4 airplanes with the a change of wing, taking out 2 seats, and/or just putting on the placard "not to exceed 1250lbs Gross" (for a sportplane) even though it's the exact same plane that can haul 1540lbs Gross.... watchout for FAA guys bearing scales eh?? heh Sonex is talking about their 150-170mph plane, just change the prop to a "climb" prop, it's now sport plane legal. -- ET "A common mistake people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools."---- Douglas Adams |
#6
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Have you looked at those vortex generator tabs placed on top of
the wing. Very negligible top end decrease. They come in a kit and are easy to apply. Users claim 5-10 kt decrease in stall. "Dick" wrote in message om... Just for discussion, what opinions are there for an individual lowering the stall speed of an existing wing considering constructability and cost? I remember there was some leading edge profile modification studies done years ago but can't see that as a practical approach for an individual. Thinking about how to add sailplane-type upper surface spoilers, WW2 fighters underwing dive brakes, etc. Dick |
#7
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I'll need to find a site. Sounds interesting. Thanks.
"Paul Lee" wrote in message om... Have you looked at those vortex generator tabs placed on top of the wing. Very negligible top end decrease. They come in a kit and are easy to apply. Users claim 5-10 kt decrease in stall. "Dick" wrote in message om... Just for discussion, what opinions are there for an individual lowering the stall speed of an existing wing considering constructability and cost? I remember there was some leading edge profile modification studies done years ago but can't see that as a practical approach for an individual. Thinking about how to add sailplane-type upper surface spoilers, WW2 fighters underwing dive brakes, etc. Dick |
#8
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Most of the people I have talked with that have VGs on their wings get
around a 10% improvement on stall speeds. 50 becomes 45 you get the picture. -- Have a good day and stay out of the trees! See ya on Sport Aircraft group http://groups.yahoo.com/group/Sport_Aircraft/ |
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