> >>
> >>      Everyone,
> >>
> >>      I have been given the opportunity to have a 12a engine.  So,
> >> will it
> >>      work in place of a 13b ?  Normally aspirated, what horsepower
> >> will it
> >>      make ?  Will the PSRU's etc., bolt up to it ?  What should I
expect
> >
> > or
> >
> >>      should I look for a 13b ?  Ignition, intake, exhaust, cooling,
etc.
> >
> > ??
> >
> >>
> >>      Kevin
>
>
> > Kevin,
> >
> > You need to define your needs between the two engines... the normally
> > aspirated Bridgeported 12a I had on the gyroplane (and still have in
> > storage) was dyno'd at almost 220 hp at 7650 rpm.   I was running a
> > pusher
> > configuration Ross 2.85:1 with 76" four bladed Warp Drive props... I
even
> > "tipped" the blades to minimize their sound effects......  the ship
still
> > created 745 pounds of force in a static run up.  (I know that static
> > run ups
> > cavitate and aren't "ideal")
> >
> > Later, when the exhaust manifold(s) died, I purchsed an Inconel
> > tangential
> > unit.  I believe the additional breathing of the tangential unit
> > allowed the
> > engine to have some additional HP that was not dyno'd for accuracy.
> >
> > Gary Buster
> > Texas  N263GB


> Gary,
> I don't know enough about them to know the difference.  What about
> weight, are they the same ?  200-220 hp would be fine for a fixed wing
> that I will build.  I read they were exported (imported into the US)
> only, so what about parts ?  The price is right, but what if it costs
> more than a 13b just to get it ready to go.  Tangential....what is that
> ?  Do you have pictures ?  Thanks for your input.
> Kevin


Hi Kevin,   dont even consider it,  you will wind up with an obsolete
engine that has to have expensive messaging and be ran beyond the factory
recomended limits to obtain the hp. it will be as heavy or worse , will

not

live as long, will cost as much or more, because most all the mods for
aircraft use are based on the 13B.  not even considering the better bsfc

you

should get with the later model engines. and it looks like fuel is headed
only one direction. i will only use a series5 or brew or rx8 myself. fwiw.
take care   wyo. walt.

Gary,
If it's free or real cheap, grab the 12A for parts.
The only reason you would use a 12A instead of a 13B is if you didn't need
the power of the 13B - then theirs he 13B single rotor engine.
The 12A is a little lighter and parts are a little cheaper, however you
would be pushed to get a housing that wasn't worn out. The housing cost is
similar to of the 13B.

Been down that track and am now working on a single 13B rotor.
George (down under)


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