Composite-ARF Impact question

[Doug Cronkhite]

I doubt it's intentional Adam..

The problem with doing something like this is the effect of spiral
slipstream varies greatly with airspeed, but so does the lift of a
non-symmetrical airfoil. If this was designed to help push the nose a la
right thrust, then as speed increased, the yaw force generated would
increase, while the spiral slipstream effect would be reduced.. Exactly the
opposite of what would be desired. 

-Doug


> -----Original Message-----
> From: discussion-request at nsrca.org 
> [mailto:discussion-request at nsrca.org] On Behalf Of Adam Quennoz
> Sent: Saturday, January 29, 2005 8:32 PM
> To: Pattern List
> Subject: Composite-ARF Impact question
> 
> Earlier this year I got to see a CA Impact up close.  It was 
> the pre-painted version.  The owner pointed out that 
> something didn't look right about the vertical stab.  I took 
> a look at it from the nose.  It seemed like it was twisted.  
> After a closer look from above I could clearly see what 
> looked like a non-symmetrical airfoil shape. The parting line 
> wasn't centered.  I dismissed it as a possible manufacturing 
> error because I've never heard of anyone designing a vertical 
> stab that way.  Well, I just received my Impact (white/red) 
> and it too has the non-symmetrical airfoil v. stab too.  It 
> seems as if it was designed to create lift to push the nose 
> right as if it were assisting the right thrust offset.  I'm 
> curious if anyone out there builds their pattern planes with 
> this feature or is this unique to this design?
> 
> Thanks,
> Adam Q
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