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Old 03 July 2015, 05:23   #1
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Country: UK - England
Town: Mersea Island
Boat name: Bondage
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5.5m tornado 150 opti testing this weekend

Ok so I have just re powered form twin 60 mercury's to a single opti 150 on a early tornado 5.5m and had initial run at low speeds, ironing out teething issues with external oil tank and some gauge issues running upto 25/30 knots. boat felt great very stable as usual in both relatively flat water and in some 2-3ft chop.

I am off testing this weekend to see how it performs a bit higher up the rev range and have been thinking about possibilities of chine walking. the hull is a medium v with a pretty large planning pad, engine has been set up 2 holes up and the boat is actually sitting with about 20mm more freeboard than with the twin 60's and engine weight is comparable although it has a little more grunt now.

I was wondering if a set of fixed tabs would be of any use if it does start to walk at a higher speed? I have read that they are useless unless on a longer water line boat but have also seen that a few people have experienced better stability at higher speeds with a set of fixed tabs?

Obviously I am going to know a lot more over the weekend but though I would learn a little more prior to going out.
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Old 03 July 2015, 05:26   #2
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Old 03 July 2015, 05:27   #3
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Old 03 July 2015, 06:27   #4
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I've run almost exactly the same set up for about 4 years.
We used the RIB as a dive boat and when loaded up with 6 divers it performed perfectly with loads of grunt in all sorts of sea conditions.....
With just the me on board the boat was very hairy at top speed (over 45knts if you pushed it!) and would often chine walk pretty badly. I never let it get out of control, but on a flat sea I would imagine it could catch you out if you didn't keep on top of it.

Depends what you plan to use the rib for, but it will be fun with that lump on the back!
Enjoy
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Old 03 July 2015, 06:33   #5
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Mitchc

Thanks for the reply good to hear other people's experiences

The rib is used for just about everything

Local back waters fishing and island hopping

Running 3 miles to a pub

Rescue boat

Days out

Towing inflatable and skiing

Maybe a bit more this year


Will find out about chine walking tomorrow I'm sure it's not that I need or want to do stupid speeds but the grunt to pull a wake board up or 2 will be nice but then again want to know limitations

Any thoughts on the tabs?
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Old 03 July 2015, 10:29   #6
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Don't think trim tabs would stop chine walking?
If you need to trim the boat, for port/stb just move the crew around to balance the boat.....fore/aft use the trim button or again move the crew.

Hope you enjoy, remember the throttle goes both ways😜
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Old 03 July 2015, 11:05   #7
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agreed throttle goes both ways....... will go have some fun and see what happens

boat popped up and sat strait up to 30 knots so will see what happens at a few more

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Old 03 July 2015, 11:36   #8
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Quote:
Originally Posted by mitchc View Post
Don't think trim tabs would stop chine walking?
No they certainly wont, not with that sort of power .. also because the spray rails on the Tornado hull are quite grippy (and the upper one inverted) you'll find the effect even more ... emm how can I put it ... frightening

I have two fixed stainless ones on mine which is a 5.4 The previous owner fitted them as it was used as a dive boat and gave the hull a bit more lift when loaded. I find that they make the hull behave more like a 5.8 - 6m hull, which is quite surprising given they are only about 6 - 8 inches long. Could also just be that its a good hull anyway one of the best Ive had IMO

Mind how you go now .. dont forget your kill cord when flight testing
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Old 03 July 2015, 11:40   #9
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kill cord at the ready ............... hopefully I will update Monday
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Old 03 July 2015, 16:19   #10
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kill cord at the ready ...............
Good .. if its flat ..make sure its just you in the boat so you dont put the rest of your friends off boating for ever ...expect violence
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