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Old 18 July 2007, 14:05   #1
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3.1m suzmar with single skin hull

Hi can anyone help.I have a 3.1 Suzmar rib with a single f/g hull.It says it can take a 15hp 4 stroke engine which weighs 46kg.I have just had our 15hp engine stolen(great) and have purchased a 2 stroke 25hp weighing 47kg.
Do you think the boat will be ok useing a 25HP.Has anyone done anything like this??
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Old 18 July 2007, 14:30   #2
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In our experience a 25 2/s on tiller on a 4m inflatable was fun but a handfull. On a 3.1, you'll have to be careful put it that way!
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Old 18 July 2007, 16:11   #3
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Go for it - I use a 15hp 4 stroke on a 3.1m sib and it's fine - yours will go like stink.

As Simmons says though watch the throttle!!! Keep your eye on the transom though - it could twist with the power.

If you think that's a load of power remember the new Avon and williams jet RIBs are the same size with 105hp............
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Old 18 July 2007, 18:03   #4
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You're going to need a lot of caution with this rig! The torque of the 25hp motor on a tiller steer will wrench sideways with a lot of force if you open it up and it all depends on where you use it... if you use the boat in rough water watch your speed as 3.1m boats fly in a swell. Just make sure that you never, ever drive without the kill cord attached.
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Old 18 July 2007, 18:07   #5
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RNLI use 40hp tiller steered and the zapcats are 50hp so a "puny" 25hp can't be that bad!!!
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Old 18 July 2007, 18:08   #6
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1. They are both bigger than 3.1 m
2. You've tried them yourself?
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Old 18 July 2007, 18:15   #7
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Quote:
Originally Posted by Richard B View Post
1. They are both bigger than 3.1 m
2. You've tried them yourself?
Yes had a brief go in a D class - great fun but they put lines/ridges on the tubes to force you to kneel instead of sitting on the tubes - most uncomfortable!!!

Anyway the size of the boat has nothing to do with tiller steering.............
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Old 18 July 2007, 18:24   #8
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It's got a lot do do with the stability of the whole rig though. V short boats will steer very sharply with tiny tiller movements and can be very disconcerting at first. Zapcats have "rails" on the base of each tube so they are hardly comparable with a shallow V hull. Did you push the D-class to the limit in a choppy sea and take off over some swells?
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Old 18 July 2007, 18:54   #9
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Quote:
Originally Posted by codprawn View Post
RNLI use 40hp tiller steered and the zapcats are 50hp so a "puny" 25hp can't be that bad!!!
The D class is 5m long and weighed down with 3 blokes and a lot of kit and the Zapcats are a different breed altogether.
Personally I think 25hp is too much for a family boat, you'll have to be so careful on the throttle, particularly if your on your own. But give it a go, just be cautious.
And if you let anyone else drive, especially if they haven't used a tiller throttle before make sure they know if they are too heavy handed you'll all be in the drink.
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Old 18 July 2007, 19:00   #10
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Send a message via MSN to Stoo
And there's the issue of insurance. If the motor is over the rating on the plate, and there's a problem, so long coverage!
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