CAD program

[John Ferrell]

I have found when you scale things up they tend to get tail heavy, not a
problem IF you expect it.

You can roughly trace the outline on wrapping paper and expand the outline
visually easier than with a cad program.

IMHO, the most important considerations for the surfaces is their stiffness
and geometry (shape, position) rather than the airfoil. For pattern purposes
the symmetrical airfoil seems to be the only practical form.

Good luck, the time is well spent!

John Ferrell
6241 Phillippi Rd
Julian NC 27283
Phone: (336)685-9606
johnferrell at earthlink.net
Dixie Competition Products
NSRCA 479 AMA 4190  W8CCW
"My Competition is Not My Enemy"


----- Original Message ----- 
From: "Chuck Czarnik" <CCzarnik at arclp.com>
To: <discussion at nsrca.org>
Sent: Friday, October 24, 2003 6:36 PM
Subject: CAD program



Anybody know of a good, cheap CAD program that would work well with a model
project?  I've got a Venus carcass and I'm thinking about dissecting and
scaling up to 2m as a winter project.  They fly so well as a .40 size that
I'm convinced it would be a blast with a 1.20 or 1.40.  I can do it with a
scanner and some image editing tools, but just wondering what else is out
there.  There is enough plane left from Venus #1 to serve as a pretty good
template.

Also any leads on airfoil design for stab / fin would be great!

Thx for any info! Chuck

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