H&H Osmond Beal Engine Choices

kmac

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What are the engine options for an Osmond Beal 29? I would be looking for a 16 to 18 knot cruise. Top end not that important but efficiency is. Diesel only of course.
 

MDI45

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Yanmar 6BY3-260 hp...or the 315 hp both are nice motors...I have two friends with the H&H 27 and 29's.....they are commercially used and have cummins motors
 

Blitzen

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Just to give you a idea, my 28 Wayne Beal with a 300 hp Cat would run all day long at 18 kts burning about 5gph. It was a 2800 Rpm motor and 18 kts was 1800 Rpm. You may not need the extra power but it sure was fun to have on those FAC days. It topped out at a hair under 30 kts.:mrgreen:
 

kmac

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I was close to building out a new 29 H&H last summer. I was going to install a QSB 5.9 480. :D

In actuality a QSB 330 or 380 would be perfect for the 29 H&H.

The QSB is about 600 pounds heavier than the Yanmar. Isn't 1500lbs a little too heave for that hull?
 

BillD

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The QSB is about 600 pounds heavier than the Yanmar. Isn't 1500lbs a little too heave for that hull?

Not at all weight wise. Take a peek @ my 25 T Jason rehab/repower project.

I'm installing a 6BTA 370. The QSB weighs maybe 100 lbs. more and the 29 H&H is a way bigger boat.

I'm also a firm believer in "heavy metal":D

Take a look @ this earlier thread on the 29 H&Hs

I looked @ the JAKL to get an idea of a build last spring. Boat has a 440 Yanmar.

http://downeastboatforum.com/downeast-boat-general-discussion/29-h-h-5478.html
 
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chrisp

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I am in the process of repowering my 29 now. I am installing a yanmar 315 hp with a 2.5 to 1 gear and a 4B 22x22 prop, Looking at A prop calculator I am hoping for a 17 to 19 knot cruise @10 to 12 gallons an hour 20+ WOT
 

captainlarry84

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Yanmar 6BY3-260 hp...or the 315 hp both are nice motors...I have two friends with the H&H 27 and 29's.....they are commercially used and have cummins motors

I do not know much about the new BY motors. The 315 Yanmar would be ideal however it is not longer being made. If she was my build I would go with a 6LY3-UTP @ 380 HP Yanmar. A great power planet. Weight is640 lbs. less the gear. I would also use a 2:0 ZF85A transmission with a total weight of 730 lbs.

If this is too much power for you my next choice is the 330 HP Cummins.
Good luck with your new build.
 

captainlarry84

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I am in the process of repowering my 29 now. I am installing a yanmar 315 hp with a 2.5 to 1 gear and a 4B 22x22 prop, Looking at A prop calculator I am hoping for a 17 to 19 knot cruise @10 to 12 gallons an hour 20+ WOT

Lucky you you found a 315 Yanmar with the perfect 2:5 gear. However I think you are under estimating your performance. These are my #s

3200 RPMs - 18.5 knots
3600 RPMs (max continuous RPMs) - 20.8 knots
3800 RPMs WOT - 22 knots

Shafting anywhere from 1.5 to 1.75 both will work.
 

kmac

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I do not know much about the new BY motors. The 315 Yanmar would be ideal however it is not longer being made. If she was my build I would go with a 6LY3-UTP @ 380 HP Yanmar. A great power planet. Weight is640 lbs. less the gear. I would also use a 2:0 ZF85A transmission with a total weight of 730 lbs.

If this is too much power for you my next choice is the 330 HP Cummins.
Good luck with your new build.

The weight of a 6LY3-UTP is 1411lbs without gear. Where did you come up with 640lbs?
 

captainlarry84

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The weight of a 6LY3-UTP is 1411lbs without gear. Where did you come up with 640lbs?

Stand correct I gave the weight in KGs from the Yanmar book.....LOL

Caught me glad someone is reading my stuff...
 

captainlarry84

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Well only my opinion with my #s. The BY is a real sewing machine, She come it at 4000 RPMs. They are velvet smooth & quiet. Do not let 4000 RPMs scare you. These new diesel are different animals that years ago.

260 BY would need:
2:5 gearing
with a 21 X 20 or 20 X 20 Dyna Quad
WOT throttle performance @ 4000 RPMs would be 21 Knots
Max Cruising RPM of 3600 would be 19 knots.
1.5 shafting is plenty.
 

kmac

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Well only my opinion with my #s. The BY is a real sewing machine, She come it at 4000 RPMs. They are velvet smooth & quiet. Do not let 4000 RPMs scare you. These new diesel are different animals that years ago.

260 BY would need:
2:5 gearing
with a 21 X 20 or 20 X 20 Dyna Quad
WOT throttle performance @ 4000 RPMs would be 21 Knots
Max Cruising RPM of 3600 would be 19 knots.
1.5 shafting is plenty.

Thanks for the response.

What about a 4LHA-STP 240HP at 902lbs with gear? What gear, prop, and speeds?

You are right, I am a little concerned with a 4000RPM diesel. The 4LHA-STP is a 3300RPM engine and also more displacement than the BY.
 

captainlarry84

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Thanks for the response.

What about a 4LHA-STP 240HP at 902lbs with gear? What gear, prop, and speeds?

You are right, I am a little concerned with a 4000RPM diesel. The 4LHA-STP is a 3300RPM engine and also more displacement than the BY.

The 4LH which was the best motor they made is no longer available. But these are my #s

Wheel would be a 21 X 21
Gear would be a 2.5
Shaft 1.5
WOT 3300 RPMs = 21 Knots
3100 RPM max continuous = 17.15 knots
 

jwalka51

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380 horsepower out of an engine that weighs 640 lbs. No wonder those things dont last long.
 
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