I guess I can see a case where the gearbox might be highly loaded in forward and heat things up a bunch and maybe heat the cup a little more than the cone? ( I dunno how Ed Zachery..?? The cone might lose some heat through the output shaft and the cup would see only the hot oil?) when when ya lock it in reverse, the thing would kinda shrink fit together and make it very difficult to get out of reverse. Wouldn't take much of a temp difference.. or maybe the little vibes from the stationary prop and the constant slight pressure of cone on cup might wiggle it together very tightly..?? I never thought of it much but I know on a couple of occasions over the years, mine had to be started in reverse to be able to get it into neutral, but that is normally not the case. So now I have a better argument for a feathering prop! Yea!
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