31/32 bhm

jnoon

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Current or prior owners, looking for some info on Engine/gear/prop and what speeds they gave you. I really need to cruise 16kt. minimum, and the ones that I have seen, I would need a re-power to do this. A little faster would be great, but it seems it would take a big jump in HP to get past a 15-16kt cruise in the BHM.
 

TwoRivers

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BHM Flyepointe 32' 1989
I have the 6BT 5.9 210 HP Cummins , 2100 hours, 12 to 13 knots wide open. I 'm on the river so not in a hurry.
 

jwalka51

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26' Webber Cove lobster boat.
I know a guy who has a 31 with a 6ct cummins. Around 300 hp. cruises at around 13kts @ 1900rpm. That is a heavy , beammy little boat. I am sure that If you put 400-450 hp in it she would do 18-20 kts no problem. But I would hate to see your fuel bill. Whats the problem with doing 13-14 kts???? Thats what these boats are designed to do, if you want to go fast, get a planing hull with outboards and pay out the nose for fuel.
 

Frank Grimes

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I am neither a current or prior owner so I won't muddy up the waters, except to say that it certainly can be done, and perhaps with not that bad of a fuel burn with a modern diesel.
 
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jnoon

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Thanks Jwalka, but I'm not in the market for a outboard "planing hull" and will stick with D/E. I am familiar with hull and its advantages and limitations and think 16kt is very realistic. We all have our own cruise speed needs, 8 or 12 kts may be fine for some, but for my run distances and time limitations, 16kts is more appropriate. I hope you can accept that;) Just looking for real world data from owners experience. My thoughts are a Cummins 6bt reman @330hp. Not sure of gear of prop.
 

VPC

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speed

two factors engine weight and HP with a 440 yanmar you'll save app 900lbs compared to a 63 volvo and cummins in that range 1.75/1 gear and tweek the prop you'll move with fair economy however IMO if you are using it as a workboat meaning hauling and continuous run i would reconsider the yanmar Add to that the little "secrets" rails, tabs and so on and well there it is. I would speak with the gentleman on here who knows those boats well OEM he could stear you in the right direction he's light years ahead of me in that particular boat.
 

captainlarry84

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KristenFormer Charter Captain
Yanmar

The key to getting the 31 BHM to run is the 2.5 reduction gear so you swing the largest possible propeller. However with a 2:5 gear and 380- 440 HP you will also need a 2 shaft installed. Most likely your 210 Cummins has only 1.5 shaft. Going to 2 is a big jump.

A 440 Yanmar @ 3300 RPMs 2:5 280A ZF gear the boat would do 20 knots for sure swing a 28 X 25 propeller with a shaft speed of 1320 RPMs A perfect combo.
 

sevenjohn

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I had a 31 BHM. I put in a 63 P Volvo with a 280 zf 2:1 reduction turning a 24x25 wheel. with a 27' stand and an 18' mast the boat cruised at 16.9-17.2 @2300 all day. The decks and topsides were stick built so I do not think she was as heavy as most other BHM'S.
 

sevenjohn

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Sorry the 63 P was a 370 HP ,it turned 2850 rpm wide open. With the stand and mast off it did 23 kts wide open flat -ass calm... by the LORAN
 

Ditchdigger

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31' bhm

Have a 31' BHM with a Volvo TAMD 60 235 HP. At 2250 RPM. she will do 12 KNTS. This is @ 5-6 GPH. Almost Embarrassing ! @t 2400 RPMS she does 13-14 KNTS. Not a speed boat, but she is a Great Boat ! The boat will do 12 KNTS. into 4' plus without pounding a lick. You brace yourself waiting to call either you'r Chiropractor, or you'r Dentist, and it does Not happen. That is the difference between Sport Fish and Down East as far as I a concerned. Slower with comfort VS. Speed with an Ass Kicking ! Pick up truck VS. Sports car.
I Need My Pick Up !
 

Ditchdigger

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31' bhm

Have a 31' BHM with a Volvo TAMD 60 235 HP. At 2250 RPM. she will do 12 KNTS. This is @ 5-6 GPH. Almost Embarrassing ! @t 2400 RPMS she does 13-14 KNTS. Not a speed boat, but she is a Great Boat ! The boat will do 12 KNTS. into 4' plus without pounding a lick. You brace yourself waiting to call either you'r Chiropractor, or you'r Dentist, and it does Not happen. That is the difference between Sport Fish and Down East as far as I a concerned. Slower with comfort VS. Speed with an Ass Kicking ! Pick up truck VS. Sports car.
I Need My Pick Up !
 

sevenjohn

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Yep. I'm putting a 33' young bros together...i don't think she'll be as comfortable as thr bhm...but it will get the job done and should be economical
 

jnoon

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The key to getting the 31 BHM to run is the 2.5 reduction gear so you swing the largest possible propeller. However with a 2:5 gear and 380- 440 HP you will also need a 2 shaft installed. Most likely your 210 Cummins has only 1.5 shaft. Going to 2 is a big jump.

A 440 Yanmar @ 3300 RPMs 2:5 280A ZF gear the boat would do 20 knots for sure swing a 28 X 25 propeller with a shaft speed of 1320 RPMs A perfect combo.

Thanks Larry. I would be inclined to stick with a cummins reman. for cost reasons.
 

BHM31

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210 Cummins - 2.54-1 - 1.5" shaft - 26 square wheel - 18000 lbs - 14 knot cruise - 16 WOT - 6000 hours and counting. Weight distribution is key with these boats. If you want 16, you will most likely need the 330 or 370 B and larger shaft. Wouldn't recommend trying to go over 16 because you will just be throwing money in the ocean. Was never meant to be a fast boat.
 

GLA

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I fished on one with 435hp 2:1 not sure the prop size, that boat did 18.5 knts

really fished nice, quite a sea boat,
 

petrel

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I've got one w/ a 315hp 6BTA and TD506 2.5 to 1. She'll run 16 knots 300 to 400 turns off the top running light. The wheel is a 26 square 4 blade blade w/ medium cup. Top speed is 20 knots or so.
 

jnoon

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210 Cummins - 2.54-1 - 1.5" shaft - 26 square wheel - 18000 lbs - 14 knot cruise - 16 WOT - 6000 hours and counting. Weight distribution is key with these boats. If you want 16, you will most likely need the 330 or 370 B and larger shaft. Wouldn't recommend trying to go over 16 because you will just be throwing money in the ocean. Was never meant to be a fast boat.

14kt sounds pretty good for the [email protected] what rpm?
 
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