need help with prop please

[joeneal1986]

i have a 22 foot beck boat with a 175hp merc xri it has a 19 pitch mercury high five and it turns it at about 5500rpm and it runs around 44mph. i would like to get a three blade prop so to gain top end so my question is what size and pitch prop would keep me around this rpm

 

[countvlad]

Re: need help with prop please

i have a 22 foot beck boat with a 175hp merc xri it has a 19 pitch mercury high five and it turns it at about 5500rpm and it runs around 44mph. i would like to get a three blade prop so to gain top end so my question is what size and pitch prop would keep me around this rpm

if im not mistaken every drop/gain in pitch is aprox 150 RPMS gain/loss... what is your manufct rec WOT range....? try to stay 25% on the high end of the range....

Generally diameter is simply a function of the design and doesn't directly affect rpm

btw im not sure if your going to gain any speed going with less blades.....