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Re: Looking for drawings of the wood ribs
FWIW here are some L-2 rib weights...
The metal rib did not include it's companion false nose rib. My new ribs use 1/4x3/8" verticals instead of 1/4x1/4" and the small lightening hole in the nose piece is a slightly smaller diameter (~1/4"). There's also no varnish as yet but then the old ribs are dried out and varnish is pretty much gone.
To keep it simple let's say the truss ribs are ~2 oz. lighter than the original wood ribs and my new ribs are ~1 oz. heavier than the original wood. With 15 ribs per wing my new ribs will be ~3 pounds heavier per wing than the truss-type metal ribs. There will be other differences in the weight of the spars and the leading and trailing edge coverings.
Another observation... seeing the metal and wood ribs stacked together it's interesting to note that the diagonal members go to opposite corners. They both avoid the drag wires. Things were surprisingly well thought out back then so I wonder why the difference. Nothing jumps out.
Originally posted by Hank Jarrett
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- Metal truss type = 232 grams
- Wood - old, origin unknown = 283 grams
- Wood - old, w/ TAC insp stamp = 277 grams
- Wood - new, built by me = 306 grams
The metal rib did not include it's companion false nose rib. My new ribs use 1/4x3/8" verticals instead of 1/4x1/4" and the small lightening hole in the nose piece is a slightly smaller diameter (~1/4"). There's also no varnish as yet but then the old ribs are dried out and varnish is pretty much gone.
To keep it simple let's say the truss ribs are ~2 oz. lighter than the original wood ribs and my new ribs are ~1 oz. heavier than the original wood. With 15 ribs per wing my new ribs will be ~3 pounds heavier per wing than the truss-type metal ribs. There will be other differences in the weight of the spars and the leading and trailing edge coverings.
Another observation... seeing the metal and wood ribs stacked together it's interesting to note that the diagonal members go to opposite corners. They both avoid the drag wires. Things were surprisingly well thought out back then so I wonder why the difference. Nothing jumps out.
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