Yes, there would no doubt be some difference between an Ind PTO and a dry clutch PTO. The independant PTO has a heavy clutch housing, dragging in oil all the time so it would probably drag a small amount more. The other factor is the actual gearing that transmits power from the engine to the output shaft. Some tractors have a straight through design in the top shaft of the transmission and then step down at the rear of the tractor. Others step down in the front of the transmission. Perhaps some more are a straight drive from the engine right out the back... but I'm not sure about that. All of those designs will have a varying degree of loss. As an example, the old Fords would lose probably about 8-10 hp from the engine's gross through to the PTO. The newer, larger tractors would lose closer to 20 through their drivetrain. Two different designs; two differing amounts of parasitic loss.
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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