Outter wing spars came from a barn in northern Michigan that had held quite a number of sets, but shortly after the Museum got theirs, the barn burned. The inner panel spars came from not far away in Kent City, Michigan.
Aftermarket kits for the rear wing spar, vertical fin attach plate, and rudder hinge were developed to address several airworthiness directives (ADs) that were issued soon after these models hit the ramp.
The purpose of the forward-swept wing was to allow an unimpeded cabin without a large wing spar passing through it),
The Saab Safari, a 1969 military trainer, used slightly forward-swept wings to increase visibility.
Since the wings were already developing 4 Gs, you don't need to increase that very much before you snap the wing spar.
Even if you don't break the airplane, you might break the pilot.
The wing spars (interior structural members) are subjected to bending while the aircraft is in flight. The lower side of the spar is subjected to tension, while the upper side is subjected to compression.
The aluminium tubes replace the wing spars. Use 10mm diameter for about 2m spans and 6mm for smaller span models.
For general aircraft work the grain slope must not be steeper than 1 in 15 and for wing spars the slope should not be steeper than 1 in 20. As previously stated, wood with no slope at all is best.
 See also: Aviation, Pilot, Wing, Aircraft, Glider
  
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