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Classic airfoil twist

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creightonious

Joined: 10 Mar 2007
Posts: 40

Posted: Tue Jul 10, 2007 7:03 am Post subject: Classic airfoil twist

We took over a project and are concerned about  airfoil twist.

 Measured from 3 points:  LE root, LE tip, TE  root all on the same plane, the TE tip is 0.60 inch elevated  (twist)

 Based on the info in Don Dykins' book (constant 1.5  degree twist) and the formula: 

 Twist (inches)=chordx(sin 1.5deg)

 We get a spec of 1.0 in twist(at)40in ([email]twist(at)40in[/email]) chord.  This gives us about 0.9deg  twist. 

 This spec gives me pause and may indeed be  dangerous at stall.  Remember, we are talking about a classic wing  here.

 What have other classic builders discovered as  their actual twist values?

 What has been done to compensate/remedy the  situation? 

 I would hate to have to throw these wings  away.

 Creighton Smith

   [quote][b]

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_________________
Creighton Smith
A 036

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