Bertram31.com General Bulletin Board

Re: 3 blade versus 4 blade props

Posted By: Ed C.
Date: Thursday, 15 June 2006, at 8:12 p.m.

In Response To: Re: 3 blade versus 4 blade props (Charlie Haws)

Charlie, i had a 1972 35 bert with 320 hp cats. 506 gear. 2;1 ratio. 4 bladed 24x24 prop.(not nibral ) My cruise at 2450 rpms was about 23 knots. My shaft was 1.75" On my 31 i used the recommendation of Capt. Pat, went with a 4 bladed 20x23 prop. with the 315 Yanmars. Top end is 34 knots, my average cruise is 27 to 30 knots.I put on 12x30 trim tabs this past winter and the boat runs better in a head sea. I hope this helps someone.

Messages In This Thread

3 blade versus 4 blade props
DavidR -- Wednesday, 14 June 2006, at 7:12 p.m.

Re: 3 blade versus 4 blade props
Capt Patrick McCrary -- Wednesday, 14 June 2006, at 7:34 p.m.

Re: 3 blade versus 4 blade props
Capt. Dick Dean -- Wednesday, 14 June 2006, at 8:45 p.m.

Re: 3 blade versus 4 blade props
Doug Crowther -- Wednesday, 14 June 2006, at 8:59 p.m.

Re: 3 blade versus 4 blade props
John F. -- Wednesday, 14 June 2006, at 9:08 p.m.

Re: 3 blade versus 4 blade props
Dug -- Thursday, 15 June 2006, at 8:17 a.m.

Re: 3 blade versus 4 blade props
DavidR -- Thursday, 15 June 2006, at 8:27 a.m.

Re: 3 blade versus 4 blade props
Capt. Dave Kosh -- Thursday, 15 June 2006, at 9:37 a.m.

Re: 3 blade versus 4 blade props
Charlie Haws -- Thursday, 15 June 2006, at 7:56 p.m.

Re: 3 blade versus 4 blade props
Ed C. -- Thursday, 15 June 2006, at 8:12 p.m.

Re: 3 blade versus 4 blade props
Charlie Haws -- Friday, 16 June 2006, at 8:53 a.m.

Re: 3 blade versus 4 blade props
Ed C. -- Sunday, 18 June 2006, at 6:38 p.m.