Prop reco for 2007 Bayliner CK212 CU

Parisjo

Recruit
Joined
Apr 24, 2016
Messages
1
WOT is 4400-4800RPM (5.0 Mercruiser) yet I am only at about 3300 RPM with a 14.5 in 19? pitch 3 blade aluminum mercruiser prop.
I also put manual trim tabs on the boat (which can be adjusted up more). R12-13x14.5 (?) Rule of thumb I read is ~1? less pitch adds ~200 RPM - this doesn't seem right - - to get 1200-1400 more RPM 6-7 ? less pitch -
Thank you for any help.
 

steelespike

Supreme Mariner
Joined
Apr 26, 2002
Messages
19,069
Your numbers are whacky.What is the gps speed at 3300 rpm?You can't make up 1200 rpm with a prop.
Does the boat respond to up trim?
Give us the gear ratio, release the trim tabs and do a lightly loaded wot(wide open throttle) test run.Get us the RPM and gps speed.
 
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