Skinny multihull...one outboard or two?

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badinfluence
badinfluence
QLD
538 posts
QLD, 538 posts
8 May 2010 10:55pm
Hi all

we have a Crowther Eureka 32 with a beam of about 15-16ft.
At the moment, she's powered with a clapped out 15hp Isuzu diesel to Volvo sterndrive legs. Hopeless......cavitates like crazy,,,motor's almost dead.

A friend suggested we instal twin steerable outboards just forward of the point of pivot, however, I'm wondering with such a skinny hull with potentially only a metre between outboard legs, whether there is any worth installing twins rather than just a bigger single?????

Any advice???????
badinfluence
badinfluence
QLD
538 posts
QLD, 538 posts
11 May 2010 8:30am
Just bumping to the top of the forum
oceans15
oceans15
QLD
35 posts
QLD, 35 posts
11 May 2010 3:10pm
badinfluence said...

Hi all

we have a Crowther Eureka 32 with a beam of about 15-16ft.
At the moment, she's powered with a clapped out 15hp Isuzu diesel to Volvo sterndrive legs. Hopeless......cavitates like crazy,,,motor's almost dead.

A friend suggested we instal twin steerable outboards just forward of the point of pivot, however, I'm wondering with such a skinny hull with potentially only a metre between outboard legs, whether there is any worth installing twins rather than just a bigger single?????

Any advice???????



Ramona
Ramona
NSW
7757 posts
NSW, 7757 posts
11 May 2010 6:36pm
badinfluence said...

Hi all

we have a Crowther Eureka 32 with a beam of about 15-16ft.
At the moment, she's powered with a clapped out 15hp Isuzu diesel to Volvo sterndrive legs. Hopeless......cavitates like crazy,,,motor's almost dead.

A friend suggested we instal twin steerable outboards just forward of the point of pivot, however, I'm wondering with such a skinny hull with potentially only a metre between outboard legs, whether there is any worth installing twins rather than just a bigger single?????

Any advice???????



Ok I'll bite. There is a new cat launched here in my home port in the last few months. I think its 38 foot, very impressive foam glass construction. It has two 9 hp sail outboard motors mounted in the rear deck area probably 12 feet from the stern. It motors easily at about 10 knots and is very quiet. It also manoeuvres exceptionally well due to the twin motors and of course it has two sets of power generators for 12 volts, plus the usual solar panels. This is a fairly wide vessel, the motors are probably 10' apart. It will be up your way shortly.

I would favour two motors.

oceans15
oceans15
QLD
35 posts
QLD, 35 posts
26 May 2010 3:38pm
A friend of mine has the same kind of boat - crowther eureka - and it has two 10hp outboards - they are just far enough apart to give a turn within its length maneurvreability.
One 15hp in the middle would be adequate and the cheapest solution.
badinfluence
badinfluence
QLD
538 posts
QLD, 538 posts
26 May 2010 8:35pm
Hey Oceans

finally went with a single 25hp Yamaha high thrust........mostly due to cost constraints....on a pod. Motor delivered to our shipwright today who is working on the pod.

The boat comes out of the water on the 8th June and we'll see how the installation goes. Thence starts the cabin sole and installation of a new gas cooker.

Wish us luck!!!!!!!! Will let you know how we go.

Also working on getting my late Dad's Triton 721 mono back in the water some time very very soon. Hopefully will meet Jess Watson on her last leg to Mooloolaba!!!

LOL...there goes my inheritance...running 2 boats!!

Cheers
Trace

oceans15
oceans15
QLD
35 posts
QLD, 35 posts
31 May 2010 9:17pm
hey trace - good luck with it all - favour mounting the motor as low as possible or cavitation can be a little annoying in rough water - it doesn't seem to hurt outboards tho. let us know how it goes with the 25hp
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