Bertram31.com General Bulletin Board

HULL SPEEDS

Posted By: craig mac
Date: Wednesday, 14 June 2006, at 12:08 p.m.

i dug out my copy of SEARACE by John Crouse-some consider to be the definitive work on the history of powerboat racing.

1961 Miami-Nassau Race--- 31' GLASS MOPPIE averaged 42.5 MPH over 184 miles

1961 Long Island Marathon--31' GLASS MOPPIE averaged 44MPH over 280 miles

1962 Miami-Nassau Race----25' AOKONE average 49.7 MPH over 184 miles

1963 Miami-Nassau Race---25' MONA LOU--averaged 55.2 MPH over 184 miles

1963 Round Nassau--25' MONA LOU--averaged 44.8 MPH over 500 miles

1964 Long Island Marathon--25' MONA LOU--averaged 48 MPH over 245 miles

1964 Viareggio-Bastia-Viareggio--31' LUCKY MOPPIE--averaged 46.9 MPH over 186 miles

1964 Cowes--31' LUCKY MOPPIE--averaged 48.6 MPH over 188 miles

1964 Great Lales Regatta---25' MONA LOU--averaged 60 MPH over 100 miles

above are the average speeds of a 25 and 31 bertram probably in less than ideal condiions.

the 25' was powered by twin outdrives---the 31 twin inboards ---some of the 31 race boats utilized v-drives to get the motor weight further aft.

although these were race boats the 31's usually had a low profile cabin deck-and enough fuel to finish the race.

i have no records--the 31's -i believe that they were using the short strut that was on early production boats and 1:1 transmissions.

i have a gass flybridge boat and have never expierenced the squirrely bow steer that some of the higher HP diesel boats are having---i believe it is not caused by shaft angle-but by the large props the diesels are turning which is causing stern lift. althogh i can not approach the speeds of the race boats my boat will run over 40 mph with no adverse handling.

Messages In This Thread

HULL SPEEDS
craig mac -- Wednesday, 14 June 2006, at 12:08 p.m.

Re: HULL SPEEDS
Richard Miller -- Wednesday, 14 June 2006, at 12:48 p.m.

Re: HULL SPEEDS
craig mac -- Wednesday, 14 June 2006, at 1:04 p.m.

Re: HULL SPEEDS
Vic Roy -- Wednesday, 14 June 2006, at 2:33 p.m.

Re: HULL SPEEDS
bruce -- Wednesday, 14 June 2006, at 5:26 p.m.

Re: HULL SPEEDS
Doc -- Wednesday, 14 June 2006, at 9:28 p.m.

Re: HULL SPEEDS
Harv -- Wednesday, 14 June 2006, at 9:58 p.m.

Re: HULL SPEEDS
Doug Crowther -- Wednesday, 14 June 2006, at 10:53 p.m.

Re: HULL SPEEDS
Harv -- Wednesday, 14 June 2006, at 11:40 p.m.

Re: HULL SPEEDS
Capt. Dick Dean -- Thursday, 15 June 2006, at 6:43 a.m.

Re: HULL SPEEDS
Capt. Dave Kosh -- Thursday, 15 June 2006, at 10:29 a.m.

Re: HULL SPEEDS
Walter Kaprielian -- Thursday, 15 June 2006, at 10:50 a.m.

Re: HULL SPEEDS
craig mac -- Thursday, 15 June 2006, at 11:24 a.m.

Re: HULL SPEEDS
Capt Patrick McCrary -- Thursday, 15 June 2006, at 11:42 a.m.

Is it chine walk?
JP -- Thursday, 15 June 2006, at 10:18 p.m.

Re: Is it chine walk?
Capt Patrick McCrary -- Friday, 16 June 2006, at 7:14 a.m.

Re: Is it chine walk?
Charlie Haws -- Friday, 16 June 2006, at 9:04 a.m.