High Quality Plan Sets and Laser Cut Partial Kits for Radio Control
Aircraft
Page 2
Henry Struck's 1937 Benny Boxcar
Here the spars and ribs are assembled loosely. If the spars are the
right size everything should fit tight without glue while you are placing
the parts
Bob Holman fixtures (www.bhplans.com)
are used to hold the ribs in position and vertical, the lower
spar is aligned with the reference line on the
plan and the upper spar is even with the wing centerline. Once you
are happy with the spar positions tack glue the first rib shown with thin
CA.
In this photo the lower spar is still flat on the plan but it should be
pulled up in to all the ribs before any are glued.
There are "feet" on all the ribs that rest on the plan so if your
building board is true the wing will be also.
Ribs are tack glued, tip spar is ready to be installed.
I had extra long spar stock left
over from another project and I did not cut it to length on this wing
panel until I installed the center splice part. The V of the bottom of the center
splice was lined up over the
mark for the lower spar and the spar was later cut to the V. The
other wing panel had the spar lined up with the mark.
With laser cut parts the
spar splices pretty much define the dihedral angle of the wing. It was pretty much an experiment to do it as in
this photo but it worked well.
Probably better though just to have the spars in the right spot
over the plan.
