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Message: <blockquote data-quote="freeisforme" data-source="post: 517205" data-attributes="member: 34644">I have a 4hp with the regular lower unit and it does pretty good on the back of a 12ft boat, it don't get on plane but it does move me a lot faster than my trolling motor. I also have a 3hp, a newer model but that and the older 4hp are about the same power wise. I had an older 3hp, from the 60's with the weedless lower unit and it was pretty much useless unless on a super light boat with no current. I could paddle faster. I'm not sure just changing the prop on those weedless lower units will work all that well, the thrust angle is wrong so they're rarely very efficient. The idea of the weedless prop is that it can operate nearly right at the surface trimmed up in shallow water and still produce forward thrust, but a normal prop will have too much cavitation at the surface and the wrong angle of thrust all the way down. Unless you need weedless drive, and if your swapping out the prop, that's out the window anyhow, go find a non-weedless 90 degree lower unit for it. and then run a good metal prop of your choice.</blockquote>