propellor pitch for 25 seafari i/o
 

Can anyone tell me if I would benefit from a 4 blade prop, I currently run a mirage 19p 454cu in mercruiser i/o WOT 4350 rpm @39kts. I am primarily concearned about mid range cruise (25kts) and fuel economy. Any help would be greatly appreciated.

Re: propellor pitch for 25 seafari i/o
 

uh oh you better post some pics ..... another 25seafari? post pics b4 people start begging

Re: propellor pitch for 25 seafari i/o
 

here are some pic's [image]http://home.comcast.net/~kenkurek/site/?/photos/[/image]

Re: propellor pitch for 25 seafari i/o
 

You got a perty bote mister
http://i261.photobucket.com/albums/i...es/deliv05.jpg

Re: propellor pitch for 25 seafari i/o
 

Perty bote in...deeeeeed :D

The last time I bought a prop for the Seafari I was too busy crying over how much I payed for it to pay attention to the pitch :eek: however I don't think I would be of much help anyway as I'm about 10 mph behind already :D

Possibly more info is required but hopefully Fr. Frank might chime in.

Brandon

P.S Ken, PM sent re: hatch

Re: propellor pitch for 25 seafari i/o
 

http://home.comcast.net/~kenkurek/pwpimages/147.JPG

Don't show strick these pictures!! 454 sounds like a good match for the boat. What kind of economy are you getting with the mirage 19p at cruise?

Re: propellor pitch for 25 seafari i/o
 

A Merc Rev 4 really improved a boat I have it's stern heavy and the Rev 4 has great stern lft as well as holding it on plane at lower speeds.

Re: propellor pitch for 25 seafari i/o
 

I like the Mirage, but some are getting better mid-range performance and economy wit 4 blades, but at the cost of a couple MPH in top end.
Rev 4, or 4B Trophy are worth a try. Better yet, contact the guys at PowerTech and ask about the OFS 4 blade.

Re: propellor pitch for 25 seafari i/o
 

Ken,
I have a '78 23' Sceptre with same power, a 7.4 liter (454ci), 330hp carb. engine and Bravo One drive. I'm also using a 19" Mirage Plus 3 blade. I'm curious to know what drive and ratio you have, as I seem to have roughly the same numbers as you, and wondering if a different wheel might be better.

Re: propellor pitch for 25 seafari i/o
 

Chris:

I am also running the same prop and outdrive. I am not sure of the ratio. I thought an 18p 4 blade would do nicely with the setup we have.