On 19/03/2013 22:02, Dave Kearton wrote:
"®i©ardo" wrote in message
...
On 19/03/2013 19:26, Dave Kearton wrote:

Hi Dave,

Yes, as explained to Indrek:

"Macchi-Castoldi MC-72 Fiat AS6 engine; dual V-12, 3100 total HP,
each engine drives one very course, fixed-pitch prop 440.729 mph in
1934. Class record still stands. Why contra-prop? Supermarine S6B w/
2650 HP on single prop overloaded one float by 32% on takeoff due to
torque."

Regards,

Ri©ardo




What fascinated me is the engineering work required to get the job done.
Not only are there two unique engines inline, but the crankshafts can't
be simply bolted together.

I've been thinking about it for a while now and I can't think of a
simple way to do it reliably.


All that effort and expense for a one-off design. Absolutely
outstanding that they got it to work at all, much less in the '30s.





It shows the prestige attached to the Schneider Trophy and it also
spurred development of European WWII fighter aircraft. There's a superb
article on the subject he

http://www.airspacemag.com/history-o...schneider.html

....all seven pages of it.

Hmm, have also just spotted a typo in the original lifted article whe
"one very *course* , fixed-pitch prop..." should surely read "coarse"!

Regards,

Ri©ardo

--
Moving Things in Still Pictures!