double connection

Joined
Apr 8, 2013
Posts
6
Likes
12
Location
Neptune new Jersey
Boat Make
35 rp
have RP 35 with cummins qsm11 580 hp. twindisc 1.74-1. 21/2" shaft,thinking changing gear to 2.04. what do you guys think about new wheel? turning 28 sq. now with 1.74 and tach out ok at 2300, but lose a couple kts when fully loaded and work/fuel rate increases quite alot.Everyone I spoke to agrees on gear change,however,different opinions on wheel size. the 28" is about max. with clearence. Will really appreciate any suggestions. first post--hope it works

Wayne
 

hntrss

Rear Admiral
Joined
Feb 17, 2012
Posts
1,064
Likes
447
Location
Oceanside NY
Boat Make
31 Duffy
Not doubt this will help you with all of the above problems, I wonder if you can swing enough wheel to go to 2.5/1? That thing must scoot the way it is set up now.
 

plowin

Rear Admiral
Joined
Dec 14, 2011
Posts
1,876
Likes
1,944
Location
Newbury
Boat Make
33' flowers
Generally speaking the more reduction you have the larger the wheel you can swing and the more weight the boat will carry at the same speed. As was stated previously the amount of wheel you can get under the boat in all likely hood will determine whether this is feasible or not. The 32' BHM is a classic example of increasing the reduction and enlarging the wheeel to help carry load and drive a not so easily driven hull.
 

traditions

Rear Admiral
Joined
Oct 9, 2011
Posts
1,426
Likes
702
Location
mid coast maine, muscle ridge channel
Boat Make
38 Holland
I tried a 2 1/2 t0 1 as opposed to a 2 to 1 on my old RP and actualy lost speed at cruise.The 2 to 1 worked best for that boat with a 300 Deere.I had a 27 bsq with the 2 1/2 to 1 and a 24 sq with thw 2 to 1.I w3as 100 rpm under with the 27 sq,but I don't think the way things were it would have made much difference in the speed to get that last 100 rpm.I would think a 2 to 1 would suit you better.Alot of boats are way over sq these days with the high HP small package engines available
 
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