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Old 30 November 2011, 16:02   #21
Bigmuz7's Avatar
Country: UK - Scotland
Town: Glasgow
Boat name: stramash
Make: Tornado
Length: 5m +
Engine: Etec 90
Join Date: Feb 2006
Posts: 5,056
Originally Posted by two stroke mick View Post
What make is the rib? and how is it set up wrt seating. How many on board?
And more importantly .. who rigged it ?


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Old 01 December 2011, 12:59   #22
Country: USA
Town: oregon
Make: zodiac
Length: 3m +
Engine: M40C
Join Date: Sep 2011
Posts: 70
I have a similar problem with my C3 and tohatsu ss 40hp. My transom is 16", the short shaft tohatsu is 17".

I unbolted the transom plate (6 screws) and raised it an inch or so which allowed me to place a 2" spacer on the transom and it is secure and no spray now.

The porpoising is most likely one of three problems:
1. the trim is tilted out away from the transom too far
2. the keel is not properly inflated, allowing the hull to flex too much
3. the floor boards aren't tightening the hull material enough, allowing too much "rocker" in the hull (can be caused by the material stretched of the floor boards worn)

The most common cause of porpoising is the first item.

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Old 02 December 2011, 06:05   #23
Country: UK - Scotland
Town: Glasgow
Boat name: Baby B
Length: 5m +
Engine: Evinrude
Join Date: Aug 2011
Posts: 30
Hi All

thanks for your replies

The RIB is made by East Coast Ribs and the Rib and engine were bought separately and put together ourselves.

Tried all trim angles, down to start with and then trimming up when she was on the plane etc but nothing worked.

I am pretty sure coming up a couple of holes will fix it, fingers crossed, I will let you know how it goes.

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