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Old 05 September 2016, 16:07   #1
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Country: UK - England
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Auxiliary Engine Size

I have a Pacific 22 (9125) with Mermaid Turbo 4 inboard and a Stern Powr stern drive.

The single engine makes me feel slightly vulnerable, not particularly in the Solent where help is never far away, but when I've been slightly further afield.

Have any previous Pac 22 owners used an auxiliary engine and if so what size?

What size auxiliary would I need to give me about 6 kts? I'm hoping a 10 hp would be adequate just to keep the weight down. The RIB weighs about 2 tonnes.

This leads me on to another question - Are there any <3m SIB's that would accept a 10hp engine. The ability to use the auxiliary as a tender outboard would kill a couple of birds with one stone.

Cheers in advance.

Guy
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Old 05 September 2016, 17:27   #2
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Have any previous Pac 22 owners used an auxiliary engine and if so what size?
the compromise is always on size of aux for speed of limping home.
A general guide mentioned here before has been 1hp per metre of boat.

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What size auxiliary would I need to give me about 6 kts? I'm hoping a 10 hp would be adequate just to keep the weight down. The RIB weighs about 2 tonnes.
Thats your maximum displacement speed.
Is the 6kts at WOT on the AUX or "cruising" speed?
There seems to be two views of what people want an Aux to do... ...limp all the way home etc, or get you to a place of safety (away from rocks, into nearest port etc). 6kts against and with a tide are two very different beasts...

Quote:
This leads me on to another question - Are there any <3m SIB's that would accept a 10hp engine. The ability to use the auxiliary as a tender outboard would kill a couple of birds with one stone.
Generally 2.7m or less are claiming 6HP, but 2.9's may be OK. Look at the 290 Waveline.
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Old 06 September 2016, 01:08   #3
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Country: UK - England
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Thanks for the reply.

6kts through the water at maximum continuous revs would be sufficient. It's more of a get out of trouble aux.
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Old 06 September 2016, 01:20   #4
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Country: UK - England
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i had a 6 m rib with a 4 hp aux 4-5 kn in ideal conditions not a get me home more out of trouble, a 10 hp would get you out of trouble easy and also great on the back of a honwave SIB.

cheers
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Old 06 September 2016, 05:48   #5
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Long or standard shaft ???????????
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Old 06 September 2016, 06:10   #6
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I use a yam 8 2 stroke on mine but it is a long shaft. I get about 6knots flat out. I did own a suzimar 2.9 sib and it was useless on it as needs a short shaf, I also tried to kill 2 birds with one stone, didn't work though.
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Old 06 September 2016, 06:39   #7
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Long or standard shaft ???????????
short not through choice fitted sib it was that far over to port prop below hull so all ok
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