Need to fine the right prop want top speed

[Maxumman2b]

Hey guys I have a 19.5 maxum 1900sr with a 2bbl 175 hp 4.3l v6 mercruiser it has the the alpha one gen 2 outdrive I have a mirage plus 15x21p on the boat with 5 adults the boat tops out at 42mph trim not up and at 5000Rpm what prop would I need to bring my rpms down so I'm not so high also give me more top end but still have a decent plain off and beable to tube and cruise around thanks

 

[Georgesalmon]

Re: Need to fine the right prop want top speed

you need to go up in pitch, 23? to bring your rpm's down. Unfortunately that would also worsen your hole shot.