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Old 05 September 2010, 13:24   #1
Country: UK - England
Town: eastbourne
Length: 3m +
Engine: petrol 30HP
Join Date: Sep 2010
Posts: 7
prop advice for tohatsu 25


looking for some advice for the right prop on my tohatsu 25 (30hp) it is currently fitted with the factory standard, top speed is ok but want more pull as i ideally want to ski behind either a sib or a Dell Quay dory boat as i am yet to buy a replacement. does anyone no what i should do to achieve this or any other setup people are running to achieve this better acceleration?


t_casselden is offline   Reply With Quote
Old 05 September 2010, 14:05   #2
Country: UK - England
Town: Mighty Penryn
Boat name: Little Joe.
Make: Avon Searider
Length: 4m +
Engine: Honda BF50
Join Date: Aug 2005
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Originally Posted by t_casselden View Post

looking for some advice for the right prop on my tohatsu 25 (30hp)
What size is the "factory standard"?

Mollers is offline   Reply With Quote
Old 06 September 2010, 06:03   #3
Country: Australia
Town: Cairns
Boat name: KAHUNAS
Make: Zodiac
Length: under 3m
Engine: 30 Tohatsu
MMSI: wft is a dsc mmsi ?
Join Date: Jun 2010
Posts: 82
Factory prop specs for the Tohatsu 25/30 are 9 7/8 x 11, and 9 7/8 x 12.

If your after holeshot and grip to pull a skier then your going to get a drop in top speed if you use that prop when not towing. For best towing results i reccomend getting your hands on a 4 blade prop. 4 blade props are common in things like surf use, where holeshot and cornering are the most improtant.

Biggest thing about props is that they are a compromise. A gain in one area is a loss in another area, which is when owning more than one prop is a good idea, that way you can change your prop to suit your needs.

Your current prop can be modified for a bit more top end if want to get a second prop for towing. Adding a bit more cup will give you a bit more top end. A cupped prop (in theory) will reach the same speed at a lower rpm. If you do get your existing prop modified, make sure you have it balanced afterwards, to minimise prop slip under hard acceleration.
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