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Old 10 August 2012, 04:15   #11
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This happened with my new 18hp Tohatsu just last week. A 1 inch block of wood under the clamps has significantly reduced splash back.

Strange that I dont get any splash back with the old 16hp Tohatsu I have (the one I bought off Noah)

I'll take some measurements this afternoon and post them to see if the distance from the clamps to the prop / plate are different to the newer Tohatsu's.
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Old 10 August 2012, 11:55   #12
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Although all brands have short shaft engines, there are minimum differences between them, some engines will match perfect transom/tail height water performance other not, so shimming is the way to go/experiment untill you find the sweet spot height then you could finally arrange for an eye catching looking as in the examples.

Happy Sibbing
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Old 11 August 2012, 15:22   #13
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Well, by simply adding a 25mm wooden shim......say bye-bye to Mr Splash-back
I could tweak some more; but this will mean adjusting the transom plate as the washers on the thumb screws at now up against the raised profile arpund the plate.

Transom height was 37cm.

Cheers for the pointers
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Old 11 August 2012, 17:51   #14
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Peeps who have done this - any real increase in max speed?
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Old 12 August 2012, 06:10   #15
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Peeps who have done this - any real increase in max speed?
I think it all depends on the boat and engine. My thundercat engine's been raised but cause of the catameran hull it raises out the water along way anyway. When i raised the on the transom the revs picked up & i did gain some speed from it
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Old 12 August 2012, 08:42   #16
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Peeps who have done this - any real increase in max speed?
No real increase for me. Air floor did seem to bulge less at WOT though. Another bonus.
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Old 13 August 2012, 12:01   #17
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Well, by simply adding a 25mm wooden shim......say bye-bye to Mr Splash-back
I could tweak some more; but this will mean adjusting the transom plate as the washers on the thumb screws at now up against the raised profile arpund the plate.

Transom height was 37cm.

Cheers for the pointers
Can you post pics of your final transom set up to see what you've done ? Would recommend to raise both engine plates to border if you hapen to have a plain border as in pics, that way engine clamps will be adjusted at middle inner plate. Raising the transom is only for solving water splashes issues at back transom forever which slows you down because of excesive tail drag against water flow.

If you could match transom shim height with water flow passing slight under upper small deflector plate would be ideal. Instant plane at wot, best top speed and perfect close turns at speed. Check video.

Happy Sibbing
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Old 13 August 2012, 16:09   #18
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Can you post pics of your final transom set up to see what you've done ? Would recommend to raise both engine plates to border if you hapen to have a plain border as in pics, that way engine clamps will be adjusted at middle inner plate. Raising the transom is only for solving water splashes issues at back transom forever which slows you down because of excesive tail drag against water flow.

If you could match transom shim height with water flow passing slight under upper small deflector plate would be ideal. Instant plane at wot, best top speed and perfect close turns at speed. Check video.

Happy Sibbing
So far, things are all temporary, I"m using a piece of softwood under the clamps. I might keep things like this for a while until totally decided on correct height required......but if shim is fixed/glued properly - I'll be stuck with the tohatsu!
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Old 13 August 2012, 16:22   #19
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If you think you'll be stuck with the Tohatsu, this is not so, all other brands have less tail issues compared to Tohatsu, this is not a malfunction, it's a tail design issue, so other brands like Yam will work fine.

Happy Sibbing
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