ORIGINAL: Dyehard
My friend with an 0S 46 powered Seamaster was also there, it quite on landing approach every flight except the last one. Being as he is a good friend, I had to rib him as he was getting in a wobbly john boat to rescue his plane.
Most likely the reason your friends OS quit is that it isn't set up right. I would be willing to bet that an OS will last a lot longer than a TT. The TT's are obviously cheaper made and if they could sell them for more, they would.