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 Wingdesign

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sarfarosh

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Number of posts : 9
Registration date : 2007-06-10

PostSubject: Re: Wingdesign   Sat Jul 14, 2007 6:54 am

Hi,
was wondering today,why cirrus 22/ turbo have uneven leading edges??? I mean towards the tips its more extended than roots.
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captbala

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Male Number of posts : 27
Age : 73
Registration date : 2007-06-02

PostSubject: Re: Wingdesign   Sat Jul 14, 2007 11:04 pm

Hawker Hunter fighter plane overcame the problems of pitch up at high speeds by incorporating the sawtooth leading edge...(identified by you as the extended leading edge towards the end ;-)

During its career, the straight wing was replaced by the saw-tooth leading edge wings, which made the aircraft easier to control at high-speed turns and preventing the pitch up problem.

There was aileron pitch-up stall which was only cured by the addition of a sawtooth leading edge to the wing.

http://www.cirrusdesign.com/sr22turbo/overview_sr22turbogts.aspx

Maybe the designers used the sawtooth design for this purpose only since it's specs say flying at reasonably high altitudes.





Max Operating Altitude
FL250 (25,000 ft)
7,620 m

Stall Speed with Flaps
60 KCAS
60 KCAS

Max Cruise Speed
219 KTAS
219 KTAS
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sarfarosh

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Number of posts : 9
Registration date : 2007-06-10

PostSubject: Re: Wingdesign   Sun Jul 15, 2007 5:09 am

Thank you Capt.Bala,

how about you metalbirdscientist?
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sarfarosh

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Registration date : 2007-06-10

PostSubject: Re: Wingdesign   Sun Jul 15, 2007 9:08 am

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sarfarosh

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Number of posts : 9
Registration date : 2007-06-10

PostSubject: Re: Wingdesign   Sun Jul 15, 2007 11:12 am

sorry, more appropriate it's called "Leading edge Cuff" for Cirrus20/22/turbo.

http://en.wikipedia.org/wiki/Leading_edge_cuff
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metalbirdscientist



Number of posts : 10
Registration date : 2007-07-13

PostSubject: R u testing us or u really want to know??   Tue Jul 17, 2007 5:38 am

Its called "saw-tooth or dog-tooth".
Reason for having it??
Its there to delay separation(of air).Flow normally separate at the tips first,which causes large changes in "Pitching Moment".
This can be reduced by introducing a "notch or saw-tooth(dog-tooth) in the leading edge(yes ofcourse towards the tips so that flow separation is "DELAYED"
Simple Isnt it?
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