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Old 12-14-2008, 12:27 PM
diver429 diver429 is offline
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Join Date: Jan 2007
Posts: 16
Default Re: Need ideas to stop porpoising?

Well maybe you guys can help me with my problem. I have a 1984 Seacraft Sceptre hardtop with a 1999 200hp mercury optimax. I would like to keep this motor on the boat until I can afford a new honda 4 stroke. I have the motor mounted on a armstrong bracket. I know I have to raise it 1-2 holes after speaking to a tech from armstrong brackets. My problem is also a prop. I need a different prop. Im running a 14 3/8 x 15 ss prop and Im not getting the rpms or the speed that Gary was getting with his 200 mercury. At cruise I have to run 4600 rpms just to go 25 miles an hour. At wide open throttle I get 5400 rpms and get 35 miles an hour. The motor is rated for 5000-5750 rpms, and I would like to get as close to that 5750 number. Will that 4 blade rev prop help me in my situation. Keep in mind the weight of the hardtop and the radar arch. At this time I know I have the wrong prop and I know I have to raise the motor either 1 or 2 holes depending on the measurement. So any input on this would be appreciated guys.
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