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