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Lowering Stall



 
 
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  #1  
Old December 17th 03, 02:10 PM
Dick
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Default 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  
Old December 17th 03, 02:38 PM
Jan Carlsson
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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  
Old December 17th 03, 02:53 PM
ET
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Posts: n/a
Default

"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  
Old December 17th 03, 11:31 PM
Dick
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Default

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  
Old December 18th 03, 12:44 AM
ET
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Default

"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  
Old December 19th 03, 03:59 AM
Paul Lee
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Default

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  
Old December 21st 03, 02:01 PM
Dick
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Default

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  
Old December 25th 03, 04:19 PM
Gilan
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Posts: n/a
Default

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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