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Old 08 April 2009, 07:31   #1
Country: UK - England
Town: Gloucestershire
Boat name: Osprey
Make: Osprey Vipermax
Length: 5m +
Engine: E-tec 300 G2
Join Date: Dec 2006
Posts: 4,008
tohatsu sail drive

Do these run a lower gear ratio? in which case would an 8HP one be any good as an aux for a 6.5 rib?

Chris Stevens

Born fiddler
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Old 08 April 2009, 08:00   #2
Country: UK - Wales
Town: Here
Boat name: doggypaddle
Make: Avon 5.4 Searider
Length: 5m +
Engine: yamaha 80
Join Date: Jul 2007
Posts: 1,107
its either that or a finer pitch prop not sure. They are propped/geared for pushing heavy hulls at displacement speeds, so i rekon a sail drive would be much more suitable as an auxiliary than an equivalent standard engine, which would be propped for a sib or small tinny. wether its poweful enough is debatable, obviously the more power the better, it will certainly get you pointing the right direction and give you headway, wether its powerful enough is obviously tide and wind dependant. IMO its quite suffecient to get you out of the doo doo.

I am usually not as green as i am cabbage looking.
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Old 08 April 2009, 10:05   #3
Pete7's Avatar
Country: UK - England
Town: Gosport
Boat name: April Lass
Make: Moody 31
Length: 9m +
Join Date: Aug 2001
Posts: 4,837
Chris, we had a 10 hp which was more than powerful enough and didn't need full throttle to make 5 - 6 knots. Just make sure you get the right shaft length, prop needs to be below the transom in clean water.

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Old 09 April 2009, 11:41   #4
richardjawilson's Avatar
Country: UK - England
Town: London, boat Dartmouth
Boat name: Lark
Make: Capelli Cap 32 WA
Length: 10m +
Engine: Yamaha 250x2
MMSI: 235096621
Join Date: Feb 2006
Posts: 189
for your guide, a 4hp 2 stroke marinier L/shaft saildrive pushes a 6.1m tohatsu along at about 4.5 knots with no tide.

8hp would be ideal
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Old 09 April 2009, 13:46   #5
m chappelow's Avatar
Country: UK - England
Town: yorkshire
Boat name: little vicky
Make: avon ex RNLI
Length: 3m +
Engine: tohatsu
Join Date: Mar 2008
Posts: 2,310
i use an 8 hp 4stroke on my 18 foot hard fishing boat though it is a displacement hull weighs around 450 kgs as it has concreate ballast it will cruise at 6 knots half throttle happy ,full out about 8 knots ,
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