Fifinella
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- Joined
- Jan 13, 2010
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Well, as you all know I started building the wood ribs.
Issue:
The ribs are built with spar slot uprights for a 3/4" thick wood wing spar as per Wag Aero drawings before I had all the Cub Club Piper drawings. What I missed was that WA has plywood reinforcements on the butt fitting and the fly strut fitting areas, plus on one side where the aileron hinge supports attach. This now makes the spar 7/8" thick at these sections and the ribs will not slide over them for assembly. Cub drawings show the wood spar thickness to be 7/8" nominal.
Solutions:
1. Keep the wing spar at 3/4" thick. Slide all the ribs on the wood spars then attach all the plywood reinforcement plates once ribs are in there correct positions.
2. Make the wing spar 7/8" thick as per original. Open up the spar slot in the built up ribs to 7/8" and not put on the plywood reinforcement plates as per Cub wood spar drawings at the butt ends.
What would you do ..... ? There are pros and cons to both, easiest is #1.
Just curious,
Keri-Ann .... I should have known better.
Issue:
The ribs are built with spar slot uprights for a 3/4" thick wood wing spar as per Wag Aero drawings before I had all the Cub Club Piper drawings. What I missed was that WA has plywood reinforcements on the butt fitting and the fly strut fitting areas, plus on one side where the aileron hinge supports attach. This now makes the spar 7/8" thick at these sections and the ribs will not slide over them for assembly. Cub drawings show the wood spar thickness to be 7/8" nominal.
Solutions:
1. Keep the wing spar at 3/4" thick. Slide all the ribs on the wood spars then attach all the plywood reinforcement plates once ribs are in there correct positions.
2. Make the wing spar 7/8" thick as per original. Open up the spar slot in the built up ribs to 7/8" and not put on the plywood reinforcement plates as per Cub wood spar drawings at the butt ends.
What would you do ..... ? There are pros and cons to both, easiest is #1.
Just curious,
Keri-Ann .... I should have known better.
