REFLECTOR: Canard incidence

[Al Gietzen]

What Al is describing is the top shape of the canard fastbuild wing as it
was made by Wingco (Alan Shaw).  Wingco added greater camber to the canard,
so much so that the standard canard incidence jig would not fit the shape of
the wing (the jig at that time was in the shape of the upper airfoil).  To
get the incidence jig to work, builders needed to add a "popcycle stick" or
tongue stick to both the forward and rearward point where the jig contacted
the wing.  This raised the jig enough to allow it to measure incidence, but
not pivot or 'rock' on the apex of the canard upper airfoil.  If I'm not
making sense, its because I just had some great wine with lasagna tonight.
The canard incidence has always been the same.  The popcycle stick thing was
only used on Wingco canards and only to get the jig to sit above the apex of
the higher camber put into the canard by Wingco.

SB

 

Hi; Scott.  The wine and lasagna sound good . . and it'll be dinner time
here in an hour or so. 

You are making sense - but, at least for my case, I think your conclusion
about the Wingco canard is incorrect. Putting the thickness of the stick at
both ends is equivalent to what I did.  The camber on Alan's canard varies
from fuselage out to the end - higher inside, lower toward the end.  Putting
the gauge about 18" from either end gives a match between gauge contour and
canard surface, and that's where I placed it for setting incidence.  Putting
an equal spacer under each end of the gauge, and moving it inboard, gives
much the same result.  Either case is too high an incidence. My Wingco
canard is 8-9" longer (not including tips) than the 154" per the manual.

 

Mack's approach (as suggested by Brendan) of two thicknesses under the front
would more likely get it set about right.

 

Al

----- Original Message ----- 

From: Terry <mailto:terrence_miles at hotmail.com>  Miles 

To: 'Velocity Aircraft <mailto:reflector at tvbf.org>  Owners and Builders
list' 

Sent: Monday, October 09, 2006 6:04 AM

Subject: Re: REFLECTOR: Canard incidence

 

This is a possible issue for me too.  Um, Scott B can you jump in here?  Has
the factory always had the very same recommended canard incidence?  Or has
it changed over the years?  ...or is there a range of degrees considered to
be acceptable based on combination factors once in the flight test phase?

Thanks,

Terry

-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Al Gietzen
Sent: Sunday, October 08, 2006 10:39 AM
To: 'Velocity Aircraft Owners and Builders list'
Subject: Re: REFLECTOR: Canard incidence

Subject: Re: REFLECTOR: Canard incidence

 

HI AL

The factory advised us to use two mixing sticks under the wingco canard gage
on our XL.

Mack  

Hi, Mack;

 

Can you tell me more specifically where/how you placed the sticks.  It will
give me a better idea of how much of a change may be necessary. Two sticks
is about 1/8".  And where did you place the gauge?  With the varying camber
from center to tip, there is only one place where the gauge fits the
coutour.  On mine it was about 2' in from the outboard end.

 

When I was installing the canard some years ago, I spoke with both Alan and
Mark Machado at Velocity, and neither suggested anything different about the
use of the incidence gauge.

 

Thanks,

 

Al

 


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