Wingdesign

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

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

Subject: 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

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

Thank you Capt.Bala,

how about you metalbirdscientist?

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

It's Dogtooth leading edge on cirrus...

http://www.aerospaceweb.org/question/aerodynamics/q0228.shtml

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

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

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

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

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?