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Old 02 August 2011, 10:35   #1
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SIB Setup

Have borrowed a friends 3.5m SIB with 20HP fourstroke for a couple of weeks, but don't seem able to use all the power. Gets up to about 15 knots, but then more throttle seems to make the prop lose grip so 3/4 throttle is max usable.

As others seem to get 15-20Knots with 10 or 15HP and similar boat I was hoping to go a bit faster.

I've tried moving more weight to the bow, which helps a bit, I've also tried all the trim settings, but if I move the trim out it porpoises significantly.

Any thoughts on this situation welcome!
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Old 02 August 2011, 10:56   #2
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I'd try a tiller extension (plastic waste pipe and a jubilee clip) and keep the motor trimmed down.
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Old 02 August 2011, 11:52   #3
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Ohhh - a four stroke 20?? - that's a heck of a lot of weight on the back of a 3.5m SIB. Sometimes less is more.
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Old 02 August 2011, 12:01   #4
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What sib is it?

Is it an air deck/hull ?
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Old 02 August 2011, 14:50   #5
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SIB type

SIB is a Zodiac with inflatable keel and wooden floor.
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