Paul,
I am new to the list and a rotary neophyte and would like some
suggestions.
I am building an RV9A and am considering a rotary conversion. I
especially
like the redundancy in the ignition and the fuel injection systems.
I have
several questions. Could a 13B with twin turbos be run without using
the two
turbos? I don't think that the RV needs the turbo power, as the
airframe is
limited to 160 hp. At what rpm do the 13B produce 160 hp and what is the
typical reduction ratio of the PSRU? I know that one turbo would
increase
the power output at a lower rpm so would adding one turbo be a good
idea?
Thanks
Russ Keith
Well if you are speaking of the 1992 and up stock twin turbos 280 HP
they
are really too heavy and probably out and out unsuitable for
constant RPM
use. They are designed for rapid acceleration. They would probably over
rev and die. Even the stock 90 to 91 single turbo 200 HP engine needs
loading down with a bigger compressor to prevent over revving.
A normally aspirated stock 13B has no trouble generating 160 HP with
the crudest of intake manifolds. However you don't have to use all
the HP for take off at sea level if you don't want to but you would
have a lot more HP at 8000 feet and on up, where you can use it, if
you started with more sea level HP. A P-ported NA 13b will have about
250 HP at 7000 RPM for take off at sea level and will breath easily
at 8000 feet for low BSFC at cruise RPM of 5000 WOT.
There is no weight penalty for configuring this amount of HP.
BTW thanks to Mark Supinski for his thinking on this matter.
He lives at 5000 feet in Denver CO.
Paul Lamar ...No rotor no motor.
The 13BREW (generation III) without the turbo should make more than 160
Hp. That's what I've got in my rv-4 and expect to get up to 190 hp with
it, NA. It's only a few months away from engine start. The twin turbo is
unsuitable for aircraft use anyway.
Brian Trubee
BTW Brian what is the skinny on Hayes Rotary?
Are they alive and well?
Paul Lamar
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