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wind tunnel propeller------------1941

Fabulous film. I bet you couldn't get spruce like that nowadays!

the last great stands of sitka spruce are in the Tongass--SE Alaska
my neighbor family spend 2 months of each summer selecting trees in the Tongass and negotiating harvest price with tribes

logs are barged down to their shop for processing into music wood---guitar, piano, etc

they own the press used in lamination of Spirit of St Louis--Ryan aircraft
that press constructed in 1880's --very much like the one illustrated in this film
 
Fascinating; thanks for posting it.

I was struck by the youth of many of the craftsmen; the film referred to "model-makers" and I guess that they were recruited from the large number of young men in that era who had, from an early age, made models of aircraft, ships etc and become highly proficient in working with wood & glue.

It was interesting to see a micrometer used on wood.
 
Fairly impressive, especially the teamwork involved in the glueup operation. All the laminations for one blade glued, assembled, and clamped in under ten minutes. A contrast to today's more automated factory.

Some other striking differences between then and today: lack of safety glasses, the prodigious use of white lead and relative youth of the workers.

Thanks for posting the link.
 
NASA's 14'x22' subsonic tunnel also uses wooden propeller:

214130main_iotw-022208-hi.jpg


12 000 horsepower on a wood prop, that's some!
 








 
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