Jeff,
Great advice, you are right on. There is a long history of wood
being used in airplane structures.
Mr. Wade,
"looking for stress in wood" /grading wood is critical. Things to
consider are: grain slope angle-straight "grain" is what you want, spacing
of growth rings...
A great resource to help with how to consider "visual grading of
wood" can be found at the national hardwood lumber association web page.
Also I a copy of a forest products laboratory report on selection/
properties for aircraft wood. I will send it to anyone who would like it or
make it available in any appropriate way.
Phillip E. Harrison
pharri...@penumbradesign.net
-----Original Message-----
From: krnet-bounces+mistion=earthlink....@mylist.net
[mailto:krnet-bounces+mistion=earthlink....@mylist.net] On Behalf Of Jeff
Scott
Sent: Thursday, February 09, 2012 9:26 AM
To: David wade; KRnet
Subject: Re: KR> (no subject)
Come on guys. Read his message again. What I'm reading here is a desire to
build the spar caps using Doug Fir rather than Spruce.
Mr. Wade. This isn't new ground. Others have done the same. Select your
wood carefully. Keep in mind that when a spruce tree is selected to be used
as stock for aircraft grade woods, it is felled and handled much differently
from your average lumber yard wood, so inspect carefully for stresses in the
wood.
Jeff Scott
Los Alamos, NM
----- Original Message -----
From: David wade
Sent: 02/08/12 11:37 PM
To: kr...@mylist.net
Subject: KR> (no subject)
Hello everybody. My name is David Wade and My KR-2 is my first aircraft
project ever. I have did careful research on my Center section spar material
and I looked at AC 43.13-1B Chp 1 pg 1-2, table 1-1. I have decided to use
Douglas fir 6 layer 1/2 inch laminate useing T-88 glue as a substitute for
spruce for various reasons both personal and non personal.Before I do I
wanted to get a few opinions and thoughts before I buy those pieces.
Opinions are always appreciated. Mr wade
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