Bertram31.com General Bulletin Board

Re: Tunnel Hull?

Posted By: Capt Patrick McCrary
Date: Saturday, 10 June 2006, at 2:02 p.m.

In Response To: Re: Tunnel Hull? (Kevin Mehegan)

Kevin,

Sorry but I really don't know the answer for the B28, other than to say that the dead rise is almost the same. The B28 has a wider beam to length ratio than the B31 and doesn't have the reverse chine. Logic leads me to think that the B28 has a higher hull speed than the B31. 40kts sounds plausable as still a safe speed for a B28.

It's kind of a mote point though, because there just isn't enough engine space to cram in anything much bigger than a 4LH 240hp Yanmar. With that power plant your WOT speed would probably be very close or just below a B31 with 6LY Yanmars. Around 32 - 34 kts...

Wouldn't matter how big a gas engine you could fit. The torque from gas just isn't enough to swing a large prop like a smaller hp diesel could with a 2:1 transmission ratio.

Best regards,

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.