Bertram31.com General Bulletin Board

Re: Tunnel Hull?

Posted By: Capt Patrick McCrary
Date: Saturday, 10 June 2006, at 1:47 p.m.

In Response To: Re: Tunnel Hull? (Blake Cathey)

Blake,

Short answer:

Won't hurt anything.

Longer answer:

The 5% reduction in shaft angle does give somewhat more efficiency and a more level ride at higher RPMs, but I'd doubt that the WOT speed on calm water of this boat would be greater than 1 - 2 knts faster than if it had the stock setup. Fuel economy might be marginally better...

The only possible down side "might" be an increased tendancy for prop cavitation.

I'd hazard a guess that this modification may have cost between $8K - $10K. It would take a lot of hours at only a slight increase in fuel effeciency to offset the $$ spent on creating the pockets.

With the 315s, there is no increased value of the boat...

Br,

Patrick

Messages In This Thread

Tunnel Hull? *PIC*
Blake Cathey -- Saturday, 10 June 2006, at 11:13 a.m.

Re: Tunnel Hull?
Capt Patrick McCrary -- Saturday, 10 June 2006, at 11:42 a.m.

Re: Tunnel Hull?
Kevin Mehegan -- Saturday, 10 June 2006, at 12:52 p.m.

Re: Tunnel Hull?
Capt Patrick McCrary -- Saturday, 10 June 2006, at 2:02 p.m.

Re: Tunnel Hull?
Blake Cathey -- Saturday, 10 June 2006, at 1:17 p.m.

Blake where is that boat on the photo ??? *NM*
Zero Cavity -- Saturday, 10 June 2006, at 1:47 p.m.

Re: Tunnel Hull?
Capt Patrick McCrary -- Saturday, 10 June 2006, at 1:47 p.m.

Re: Tunnel Hull?
Paul Haggett -- Saturday, 10 June 2006, at 9:18 p.m.

Re: Tunnel Hull?
Capt Patrick McCrary -- Saturday, 10 June 2006, at 10:04 p.m.

Re: Tunnel Hull?
JP Miller -- Monday, 12 June 2006, at 4:03 p.m.

Re: Tunnel Hull?
Capt Patrick McCrary -- Monday, 12 June 2006, at 4:21 p.m.

Re: Tunnel Hull?
Peter -- Monday, 12 June 2006, at 4:45 p.m.

Re: Tunnel Hull? *PIC*
bruce -- Monday, 12 June 2006, at 6:39 p.m.