how to choose prop pitch&number of blades

Reply Subscribe

Thread Tools

04-25-2005, 07:03 PM

crazy canuck

Gold Member

Thread Starter

Join Date: May 2001

Location: Niagara Falls , Canada

Posts: 144

Likes: 0

Received 0 Likes on 0 Posts

how to choose prop pitch&number of blades

I have a 1984 30'scarab blown454's aproximate horsepower 600 trs drives .If i run a four blade prop what pitch should i use keeping the rpm's 5500 to 6000 looking for top end speed?

04-25-2005, 07:46 PM

bbladesprops

Offshoreonly Advertiser

Join Date: Jun 2003

Location: Princeton, Wisconsin

Posts: 3,875

Likes: 1

Received 46 Likes on 13 Posts

Re: how to choose prop pitch&number of blades

What is the wet weight of the boat?

This includes fuel, people, gear, food, beer, ice, etc., etc.

What is your gear ratio?

__________________
Brett Anderson / BBLADES Professional Propellers
920-295-4435 http://www.bblades.com/
[email protected]

04-26-2005, 02:22 AM

crazy canuck

Gold Member

Thread Starter

Join Date: May 2001

Location: Niagara Falls , Canada

Posts: 144

Likes: 0

Received 0 Likes on 0 Posts

Re: how to choose prop pitch&number of blades

The drive ratio is 1.5 to 1 ,the weight i'm not sure but i guess 7800 8000lbs ?

04-26-2005, 06:50 AM

throttleup

Registered

Join Date: Mar 2002

Location: Cajun Country

Posts: 5,143

Likes: 0

Received 1 Like on 1 Post

Re: how to choose prop pitch&number of blades

Start with a 24 or 26 Bravo 1 or 23 through 25 Hydromotive. The 23 or 24 should put you in the top end of your rpm range while the 25 or 26 should put you toward the bottom end of your rpm range.

Matt