Originally posted by 2dogsnight
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The tail end of the crankshaft goes into the clutch pack. The other side of the clutch pack goes to the output flange, which is bolted to the prop shaft. So when the clutch is engaged (by pushing the lever into "forward" position), the clutch connects the prop shaft to the crankshaft. So they turn as one. The whole clutch pack rotates with it.
When you push the lever to "reverse", it tightens the band around the clutch pack to stop it rotating. This causes the planetary gear mechanism to kick in, which makes the prop shaft rotate in the opposite direction. Due to the little planetary gears, it's not a direct drive, as it is in forward, and it reduces the RPM a bit.
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