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Old 13 December 2008, 15:31   #11
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My dad did the same for my first sib many years ago. He had an T model little metal plate with a screw in the short part of the T.... The screw made it impossible to go further then 50% throttle. It stopped the carburator from opening up further then 50% with that screw. Very simple but effective method.

Hope I'm making any sence......

Reason I remember this system really well, is because I found out how it worked quickly and ofcourse made sure I could go 100% throttle again, without the old man knowing ofcourse......
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Old 13 December 2008, 19:57   #12
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There are lot's of very ingenous methods for restricting speed, as there are manufacturer's different ways for controlling carb acceleration, modern engines uses mostly cable & cam, levers and pinion & shaft throttles, a matter of bringing the right solution for each engine method used. The fastest to adjust are levers and shafts throtles as you will only need to adjust wot bolt stoppers to achieve less carb opening.

Happy Sibbing
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Old 14 December 2008, 14:00   #13
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Thanks.......

.........guys - will give it a go this weekend.
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Old 14 December 2008, 15:41   #14
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Hi Meme - Just thinking about the same things with my 2 girls ( 11 & 13) . I'm going down the line of thinking that they need to know how to hande the full power range of the boat ( starting with my 4m / 50hp Avon) . I thougt about restricting them, but then worried that when it was 'de-restricted' they ( on reflex)would think they could go to what they thought was full power- to find another hand full of power they had no experiance of, and end up in trouble.

Are you planning to back of the restriction over time ?

Any pros/ instrctors have any experiance of anything like this - used to 25hp & then tryng to handle 200hp in the same way ?
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Old 15 December 2008, 05:43   #15
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I plan.........

........to tutor her in the full speed of the sib with me aboard and her at the controls however, thereafter when letting her loose alone I will restrict it to something yet to be determined however, enough to get her on the plane but not WOT.

Once I feel she has mastered the art of gettiing out of the hole and piloting it to and from the beach, I'll let her have WOT.

It's a pretty much, play it and see approach - she is very sinsible however there is o harm in prudence just to get started.

I'll keep you informed - the Christmas break should find us on the water in some form or another.
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Old 15 December 2008, 06:30   #16
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How are the rules in UK actually?

In the Netherlands there are very strict rules.
If you want to be in controle over a boat longer then 15 meters or able to do faster then 10.8 knots, you'll need to be at least 18 years and have a special license for these kind of boats.
So under 18 a SIB with up to 6 hp would approx be the limit if you are alone in it.
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Old 15 December 2008, 08:12   #17
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Rules - boating - UK - ? We can just do what we want with no regard for common sense, life , engine power , size etc !

Seriously - anyone with a brain ( ie Meme etc ) will be sensible , however you do see & experiance no end of very young children in control of boats that are very powerful .

Thankfully a lot of them are aware and have experiance from a very young age , some however are not aware or experianced.
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Old 15 December 2008, 10:19   #18
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Well that sounds a lot better then here in Holland.....
Although I do think that you absolutely need some experience to be able and save with powerfull RIB's or SIB's which can exceed 15 knots orso.

But here in Holland the license is all about theory, no practice on a boat or whatever...
So any idiot who can read and learn all the rules can get the license, but might still be far from able to drive a powerfull boat safely.

In my case, got a lot of tickets when I was young and messing about with the SIB's....
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Old 16 December 2008, 09:18   #19
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Wot Restriction Example

As said before, systems that use bolt stoppers are the quickest to adjust without having to lose time building a special restrictor part. A good adjustment that gives excellent planing & hole shot is the furthest distance travelled before the roller starts to "climb" the cam sharp angle, this will be the max speed cruise position with 3/4 open butterfly. Just adjust the stopper CW to match that restricted position (pic 4) This restrictor adjustment can be applied to any 1, 2 cylinder outboards using throttle stoppers in terms of more or less amount desired restriction.

Pic 1 : full wot, cam/angle/butterfly position
Pic 2 : cruise, cam/angle/butterfly position
Pic 2 : full wot stopper position
Pic 4 : cruise stopper position

Is the same method in restricting/degrading a Tohatsu/Nissan 30HP to 25 HP, (-5 timming, carb wot restricted by stopper)

Happy Sibbing
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Old 16 December 2008, 10:53   #20
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Bloody........

...........brilliant - thanks -
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