The reason I ask is for my brother. He has a similar rig with the F150. His came with a Powertech OFX 21" pitch. He's thinking about trying a Mercury Tempest and a Mercury Trophy both in 21" pitch. He tried my 21" pitch Yamaha Saltwater Series 2. It turned 300 rpm's less than the 21" Powertech and chattered really bad at idle. I believe the 150 needs a lighter weight prop.
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