On Apr 19, 12:37 pm, Bob Kuykendall wrote:
Earlier, wrote:
Looking over the available illustrations on the net it appears
that the typical radial aircraft engine had a stroke longer
than the bore (undersquare). Is that right? ...

I think that most radials have bore to stroke ratios in line with
similar engines of other configuration. However, they often have
fairly long connecting rods (which is independent of stroke), which
tends to visually exaggerate the stroke.

Thanks, Bob K.


I'll have to check a few of my Dad's radial engine A&P books from the
50's & 60's. Lots of interesting specs and procedures for tearing down
and rebuilding. Its interesting to see how only the master rod is
connected to the crankshaft, and all of the other rods connect to the
master rod. Very interesting lower end geometry, and I'm sure the
resulting harmonics are even more entertaining when plotted. Its a lot
like music when you think about it!

Harry