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Thread: Building technique: Utilizing a Wing-Jig, Scale P-51 "Speed Wing"
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Old 02-28-2015, 09:52 PM
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Iron Dog
 
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General Wing Assembly:
  1. Prepare main spruce spars, labeled “Spar A” on the plans. A total of (6) 1/8” x ¼” x 36” spruce spars are needed. (2) more will be used later as rear spars, for a grand total of (8).
Sight down the length of each when purchasing to ensure they are as warp-free as possible. It is recommended that any warps or bows are “opposed” – and therefore “negated”, as much as possible. [Picture these parentheses () as bowed spars. Opposite bows can largely cancel one-another out, once glued. Spars glued bowing the same direction . . . (( . . . are more likely to introduce a warp.]

a. Cut four of them to a length of 28”. This will shorten them enough to fit within the confines of the wing jig, yet give enough extra length to serve as a “fudge factor. (If one end is more warped, remove 8” from this end.)

b. Cut two of the remaining 36” lengths in half. Glue each 18” half (opposing any potential bows) to one of four 28” full-length spar pieces. These pieces should be aligned at one edge, not centered (Example: –––––––––); and should now be free from warps and bows.


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Last edited by Iron Dog; 02-28-2015 at 09:55 PM.
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