charles.harbert wrote:

Hans, I think you can get better BSFC keeping a turbo engine under 5K rpm-see
Paul Yaws dyno chart. It's really a very complicated issue, but I think this is

the bottom line. This assumes you have an adjustable prop.

I forgot to say that I'm looking  at a rotorcraft application, so power will be
needed in a narrrow RPM range.  Downside is that you usually don't run at less that
85% power, so I am concerned about the sustained power required.  The designer is
talking 415 HP, so 352HP sustained, but I think his HP numbers are low ( I want
more fuel onboard) so I am thinking more like 450-510 sustained HP and leaning
towards twin 13Bs.

I want to be sure we can reject the heat before we pay for the design concept work
around the wrong engine.

Hans

 
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