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Old 15 July 2014, 13:18   #31
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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: 2,890
Most of us have the opposite problem on SIB's and you need to add a wooden spacer block to raise the engine 1" or so. Certainly on the Aerotec and Zodiacs this is essential.

Best way to measure the set up is to get a cheap tiny tach off eBay (about £10) and measure the RPM at WOT with this and the speed with a GPS to fine tune trim and engine height.

Having said that 9/10 postion 2 is always the one and a block is needed as above.

Did mine last week and position (1) got me 5450 rpm and 17.5 kts or so, position (3) 5650 rpm and 18 kts (but horrible to get on plane due to raised bow) but position 2 wins at 5750 rpm and maxed out briefly at 19 kts.
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Old 11 July 2018, 18:01   #32
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Country: UK - Scotland
Town: Winchburgh west Lothian
Boat name: Papa Bear
Make: BWM 500 Dive Rib
Length: 5m +
Engine: 75hp +5hp Mariners
Join Date: Dec 2013
Posts: 156
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Use a motorbike battery
Quote:
Originally Posted by Fenlander View Post
>>>>I got the car battery clip on version

Then you have the answer... a £15 generic 12v battery for alarm systems etc from Ebay. My Bravo has a side pocket in the case this will fit into. A full charge from a small battery will only just pump up the boat but is fine for topping up.
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