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Old 16 August 2009, 06:33   #11
lightning's Avatar
Country: UK - England
Town: Marple
Make: Zodiac
Length: under 3m
Engine: Tohatsu 9.8
Join Date: Jun 2009
Posts: 586
Boat speed

Went to Windermere this weekend, seems Like I was worrying too much! Out on the (fairly choppy) lake a brief burst of full throttle with 2 of us on board saw 14.5mph on the GPS.
I say brief as the speed limit on Windermere is 10mph (6 in places).
Opening the throttle it does take a few seconds to get going.
The large wash at about 5-6mph clears and the boat then increases speed rapidly.

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Old 16 August 2009, 12:33   #12
Locozodiac's Avatar
Country: Other
Town: Lima-Peru
Boat name: Nautile
Make: Sea Rider Boats
Length: 4m +
Engine: Tohatsu 18 /30 HP
Join Date: Sep 2007
Posts: 1,706
Originally Posted by lightning View Post
I've got a Zodiac 285s SIB and Mariner 6hp engine. The instructions for the engine state that the anti-ventilation plate should be 1-2 inches below the bottom of the boat. on my boat it's just under 3 it worth fitting a spacer to raise the engine an inch or will it make no difference?
If your zodiac has 40 cm measured from upper transom to sib's bottom transom will be ok if using Mercury/Mariner/Nissan/Tohatsu engines, if not, under 39.5 -38 cm, might experiment water splashing inside sib, correct heights parameters improves performance with less water drag/splash issues on tail.

Happy Sibbing

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