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Box Spars
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The spars are made of aircraft
grade Sitka Spruce. Purchased from Jean Peters of Western Aircraft Supplies
in Calgary, Alberta, Canada. The quality is excellent and he milled the
stock to my specifications for the modifications that I made to this aircraft.
I received my wood shipped by Northwestern Airlines Cargo from Calgary
to Boston. It arrived in two sonotubes 14' and 10' long. Now I have a
Dodge Dakota with a 6' bed. So 8' of expensive aircraft lumber was hanging
out of the truck.
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I picked up the spruce, took
it to work, worked my shift, then continued the 50 mile trek back home
from Boston.
The only place large enough
to build my spars was the front porch. So I stacked 8 cinderblocks in
two columns and spanned them with 2 8" steel studs and a flat 2 x
12 on top of the studs. I laid out jig blocks 6" on center for the
verticals. I also set up blocks for the height requirement for the new
AS5048/46 airfoils..
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All the spar caps were ordered
slightly oversize from the finished dimensions so that any irregularities
could be corrected by running the spars through a surface planer (with
new sharp blades) to the final size. System
3 T-88 Structural epoxy Adhesive was used throughout all the wood
construction of the spars and fuselage.
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The ends of the spars were
made solid to keep from breaking out when drilling for the WAF's.
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