Need prop help

[Greenhead2012]

We are having an issue with a 1992 692 Ranger Fisherman with 1992 Mariner 150 Magnum 3. It has a five blade mercury high 5 ss prop (don't know the pitch) which we are hoping is the problem. We checked out the motor and changed everything from plugs to fuel filters. All 6 cyl are 108-110 on compression tester. With two guys, 4 batteries and 9.9 kicker it takes atleast a minute to get above 10mph. 0nce it hits 15mph (if wind is in ur face u wont get on plane) it will plane out and trimmed up runs 38 mph at 4000 rpm tops. We were on Erie 2 weeks ago and coming back into the wind/waves we couldn't get over 10 mph and couldn't get on plane with 3 guys. The only thing we are thinking it could be is the prop. Is there anyone on here that could help us out on which prop this boat would run hard with? Manual says motor should be running at 5-5600 rpms. Thanks guys!!!

 

[steelespike]

Re: Need prop help

Read "read this first at the top of the prop page.You probably have a very high pitch prop. Numbers should
appear near the base of the blades or under the prop nut.

 

[Greenhead2012]

Re: Need prop help

Read "read this first at the top of the prop page.You probably have a very high pitch prop. Numbers should
appear near the base of the blades or under the prop nut.

Our current prop is a mercury marine high five 12 3/4 dia by 20 P.

 

[Greenhead2012]

Re: Need prop help

Anyone able to help? Do you guys think the prop can cause the boat to lose that much power???

 

[pootnic]

Re: Need prop help

Sorry,can't really help but a 20 pitch for that size boat seems to be in the ballpark,plus it's a 5 blade.
It should really jump on plane with a 5 blade but maybe a 20 pitch is to big for 5 blades?(3 blade range in the 21-24 pitch range)
Did it always have a 5 blade,(alot of ski boats use them)and why?
Kinda stumped,boats not full of water is it(foam,wood if any...),still might be motor issue,set up issue...sorry