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astro1993
08-05-2007, 08:15 PM
Can someone help me. I have a 1984 Catalina 281 with twin 230hp. WOT rpms are around 3500. The manual says WOT should be around 4000-4400 rpms. I have 12" props with the number 3217 on them. What size props are best for this boat? Do you think they were changed?

koffeejohn
08-06-2007, 10:13 PM
"If you go with Michigan Propellers, the correct ones would be:Left-#310593, Right-#310592. These would be Michigan Dyna-Jet Cup Nibral. The size is 13x11. I have a 1985 281 and that is what the boat calls for."

astro1993
08-09-2007, 07:59 PM
"john, what is your rpms at WOT?"

koffeejohn
08-10-2007, 04:54 PM
I replaced the 305's with 350's but left the original props on the boat. WOT is 4600. I cruise @ 3000rpm and go 21 mph.

astro1993
08-10-2007, 08:20 PM
"I have 305's and cruise @2800rpm and go 28 mph, does that sound right"