My buddy with the farm scrapyard just recently cut up an identical pair of IHC farm machinery thingies that each contained a large 33" OD x 5" wide, spoked, cast iron flywheel, clutch in the middle of the flywheel sitting on the high speed shaft of a single stage 7-1/2:1 gearbox. From the gearbox slow speed shaft is a really huge crank throw made of cast steel. The stroke would be about 3 feet or so. The other side of the crank throw has a 90 degree 1:1 angle drive gearbox of very heavy duty specifications. My guess is the propulsion came through the angle gearbox to run something modulated by the crank con-rod, and the big step-up gearbox was there to store energy in the massive flywheel. The clutch is there to stop parts from breaking if the path of the reciprocating con-rod became jammed.
Unfortunately I cannot post pictures at this time. I have two identical flywheels, two 7-1/2:1 gearboxes and two 90 degree unity gain gearboxes as described. Also have the two crankshafts and con rods with the load end cut off each. I'll bet these flywheels weigh 300 lbs each.
I may use one of the gearbox sets in my wind turbine. The other pair will become replacement spares and the flywheels are available for a possible down the road DIY slow speed engine proyect. I would love to have a 10 HP liquid cooled single that runs at about 300 RPM!
