"Richard Riley" wrote in message
...
On 16 Mar 2004 18:38:03 GMT,
(Wright1902Glider) wrote:

:Ass-uming a single engine, chain-driven, counter-rotating prop config...
Your
:2-bladed wooden props would only be 13.25 miles in diameter... each.

What RPM would they turn? We have to keep tip speed under mach.

I think the tip speed would under the visible spectrum.