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Posted by Olog-hai on Thu Dec 7 20:46:38 2017, in response to Re: USA USA USA, posted by FYBklyn1959 on Thu Dec 7 20:34:32 2017.

The H4 was made almost completely of birch wood; the reason there was due to the WWII restrictions on aluminum.

The 28-cylinder Pratt & Whitney R4360 "Wasp Major" radial engines weighed about 3,800 lbs each by themselves, and there were eight of them; the JT9D (747 engine) weighs about 8,600 lbs, but you wouldn't need eight of them to power something like the H4. (The JT3D, the Boeing 707's low-bypass turbofan engine, weighs about 4,650 lbs.)

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