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Single cylinder deutz life boat engine

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captjack
New member
Username: captjack

Post Number: 1
Registered: 04-2006
Posted on Saturday, April 15, 2006 - 09:08 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

i have a couple of 14 hp air cooled single cylinder deutz marine engines with marine gears that came from old life boats. i am planning on building a 21 foot launch to put one of them in. i would like any information you may have on prop sizing . these are really cool moters they run like sewing machines and turn up 3000 rpm
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miro
Senior Member
Username: miro

Post Number: 220
Registered: 11-2001


Posted on Monday, April 17, 2006 - 11:04 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Assuming that you run the engine at 1500 RPM and you have a 12 in pitch prop with a 25% slip, you'll ( theoretically) will get about 11 mph. That is slightly over the terminal hull speed for a 21 ft dsplacement hull. So a 12 in pitch is a good place to start.
Assuming that your engine is rated at 14 HP at 3000 rppm, and knowing that (torque x speed) = HP and further assuming a failrly flat torque curve for the engine, you'll be getting aboutr 7 HP at 1500 rpm.
So you'll want a prop diameter that will absorb 7 HP and a 12 in pitch. A good guess is in the neighbourhood of about 12-14 in diameter.

There are plenty of references about how to estimate proplellers, but it comes down to the assumptions and how acurate they are ( and there are a lot of them) .

Propleller sizing is ( or can become) an endless discussion and experience is about the only thing that settles it.

miro
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mktraders
New member
Username: mktraders

Post Number: 2
Registered: 08-2009
Posted on Wednesday, August 26, 2009 - 01:50 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

We have SABB DIESEL,YANMAR, BUKH, VOLVO PENTA, LISTER,PROMOMER(Argentina) for sell, HP: 22 to 68 HP all are water cooled and in running Conditioned. If you interested please give us an email. please dont send any email for asking if seriously like to buy then please contact. we collected the engine from the demolition ship we also have used lifeboat for sell too. mktradersbd@yahoo.com

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