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Old 18 December 2012, 07:35   #1
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Country: UK - England
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Boat name: Reach Out
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New Rib is giving me sleepless nights

Well not that concerned really, but please comment on my issue...

My new 2010, oceanrunner 4.1m rib has a 30hp tohatsu efi 4 stroke. power trim etc..

All looking as new, done very low hours clearly...

The motor is sat very high on the transom in my opinion. The anti ventilation plate is a good 50-60mm obove the keel line (bottom of hull).

The previous owner says it worked well for him...

I am worried about loosing grip on the water with the prop (ventilating) (prop size 9.9 x13)

or even cooling water not getting in.
Should I be worried, or will it be OK. Should I lower motor by cutting transom or change motor for a longer reach , which I am reluctant to do having just spent 1000'S on it, and its as new.

Why did ( or even did they??) a well know south coast boat company ( The wolf rock boat company........) supply and fit this outboard so high?? Was this a mistake or has the motor been changed? Paper work says this was the original motor..

I can cut the transom down, but this seems drastic to me on such a new nice rib... should I just try it?

Any input or opinions/suggestions will be welcome...
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Old 18 December 2012, 07:44   #2
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I am sorry there is no quick fix on setting an obm on any boat , it is all try and adjust, as for cutting the transom down that would have to be the very last chance, as a rule of thumb the cavitation plate should be level with the btm of the boat with a aluminium prop , but could be slightly up from the btm of the boat with a stainless steel prop, its all trial and error, good luck
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Old 18 December 2012, 07:47   #3
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Is there scope to move the motor down on its mounting bolts? I'd say try it out, see how it is then think about how it can be moved if needed without cutting or drilling anything?
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Old 18 December 2012, 07:49   #4
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I'd say... Try it! Get it on the water, have a go, and see if it works.
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Old 18 December 2012, 07:55   #5
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I'm curious as to why you are asking these (excellent) questions AFTER you purchased the RIB?

IIWY, I would phone Wolf Rock and (nicely) ask if they fitted the motor (good to know anyway) and if the height was determined by them or did the buyer spec or supply the motor fitted. You'd be AMAZED at how many people INSIST on fitting a wrong sized motor (HP or length) to a new RIB...

If the motor is confirmed as fit for purpose, then I'd test the RIB and watch the telltale during use. You'll need full trim down for turns, most likely. Why would you butcher a transom without testing it??

What IS the shaft length on the motor? S, L, XL?
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Old 18 December 2012, 08:24   #6
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Take it out and see where the plate sits in the water when you're on the plane, I had to lift a motor a good few inches to get it working properly.

50mm doesn't seem that high to me, have a search on here, there's been quite a lot of discussion recently.
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Old 18 December 2012, 08:35   #7
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Thanks guys!

I would not cut the transom with out testing and failing badly..
I bought the boat as it was a good price and as new. The subtle issues come out in the wash / in the eating of the pudding etc.
I could not of walked away from buying this boat, its mint.....

This is about tuning and performance/reliablity.... I do not regret buying it, and the gentleman that sold it says it runs well and I believe that is his opinion.

Maybe the boat was setup to run a stainless prop....... An aluminium one is fitted now.

No room to move the motor down on its bolts as in the lowest slots, and it is sitting on ther clamps also...

I will only cut the transom down as a last resort if the boat is poor on water etc.... and after much thought..

thanks again. any more ideas welcome, as I have months before the weather is good again....

I will check the motor length, but seemed to be around 18 inches (not a real size.) early days as I only spotted the issue last night after the guy buying my old engine (different boat) asked questions about the old boat transem height by text..
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Old 18 December 2012, 08:48   #8
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IMG_1344_zps5b516773.jpg photo by simsy1962 | Photobucket
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Old 18 December 2012, 08:52   #9
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I wouldn't hesitate to call the guys at wolf rock , they were very helpful to me and did an excellent job on my ribtec refurb and motor install. IMO they really know what they are doing
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Old 18 December 2012, 08:54   #10
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That looks like a short shaft motor. The specs are here

There isn't much freeboard with that transom so fingers crossed she runs well as it is.
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