Shortround6
Major General
I am trying to keep it to engines that were actually used. ![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Was the RM17SM standard engine ever used in a service aircraft?
While many engines performed absolutely amazing stunts on test stands ( a P&W R-2800 once survived 150in of manifold pressure or 60lb of boost) other engines never went into service with planned or announced HP ratings. It may be that post war engines for civil use ( or even military use) weren't pressed as hard as war time engines because of safety or longevity concerns.
Very late Allisons did go to 3200rpm instead of 3000rpm but they used a different crankshaft with more counter weighting. It weighed 27lbs more than the "normal" crankshaft and, since it fits into older blocks, is the crankshaft of choice for high performance rebuilds.
Was the RM17SM standard engine ever used in a service aircraft?
While many engines performed absolutely amazing stunts on test stands ( a P&W R-2800 once survived 150in of manifold pressure or 60lb of boost) other engines never went into service with planned or announced HP ratings. It may be that post war engines for civil use ( or even military use) weren't pressed as hard as war time engines because of safety or longevity concerns.
Very late Allisons did go to 3200rpm instead of 3000rpm but they used a different crankshaft with more counter weighting. It weighed 27lbs more than the "normal" crankshaft and, since it fits into older blocks, is the crankshaft of choice for high performance rebuilds.