Paul
I have a dream project of building a Howard DGA 15 in composites. The problem
is the engine. I do not want to use an old radial but two 13Bs driving a 99
inch prop at a max of 2800 rpm. I figure two 13Bs could deliver 400 to 500
hp, and look ok under a little longer cowling.

What do you think, doable?

Regards,
Norm Parmley

Dreams are only thoughts however, they alone keep us looking to the future.
Norm Parmley January 12, 2011

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SZP is the Howard DGA capital of the world and what you just
suggested would be considered blasphemy around here :)

That might work but the belt drive would have to be well
over 3:1 to drive a 99 inch prop. Now why don't you just scale it down.
Nobody will notice and there will no longer be a gymnasium inside :)

Use a 3 rotor and move the real firewall back a few inches.
The scale cowling will appear ok but there will be a tunnel
in the firewall to accommodate the 3 rotor aft end extra length.

Paul Lamar