double connection

[double connection]

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]

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]

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]

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

 

[longislander89]

If you are going to be way over square would a 5 blade wheel help?

 

[F/V Split S.e.c.o.n.d.]

I would try putting 2 in. of pitch into your wheel for a start.. sea trial her and go from there. Good luck..

 

[double connection]

Thanks for input. We are going to put 2 inches pitch in the 28" as suggested. also have a handle on a 28x33.Leaning on trying the 28x33 first. Thanks