Re: OT, Balboa Park

[Jerry Krakauer <jsk977@optonline.net>]

The last iteration of the Pratt & Whitney turbo-compound radials used in the
DC7s and Super Connies were 4 row 36 cylinder monsters. Just think, with
dual ignition that's 288 spark plugs to change per aircraft.  BTW, the
turbo-compound concept was the last effort to get the most power out of
piston aircraft engines. After exiting the turbo supercharger the exhaust
turned one more turbine that was geared to the back of the crankshaft adding
more torque.

Jerry Krakauer
SRL311 00099