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Old 12 August 2013, 14:28   #11
Country: UK - England
Town: Sussex
Boat name: Bombard, Y-162
Make: Aerotec 380, Y-Class
Length: 3m +
Engine: Mercury Mariner 15hp
Join Date: Jul 2010
Posts: 2,500
Bigscott, just do a search for posts by 'locozodiac' - he's the master of SIB OB height optimisation and has posted loads of pics on the subject.

You need to go out on a calm day with a tach, a GPS and various raiser blocks doing some fine tuning.

Start here:

Futura Mk3 owners: What prop/max. speed?

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Old 13 August 2013, 03:33   #12
lightning's Avatar
Country: UK - England
Town: Marple
Make: Zodiac
Length: under 3m
Engine: Tohatsu 9.8
Join Date: Jun 2009
Posts: 551
Yes you do need to experiment with your own boat/engine.

I found that with the smaller plate level with the keel (as above) there was a lot of splashback into the boat, no matter what I did with the engine trim.

A block of wood under the engine mounting cured it completely, although it only raised the engine less than 2cm.

So that's why my picture showed the engine slightly higher. But I have the Tohatsu 9.8 two stroke which is known, I am told, to suffer from splashback. I never needed a riser block with my previous engine.

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