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Old 28 May 2015, 15:11   #1
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Country: UK - England
Town: Wigan
Make: Bombard 380
Length: 3m +
Engine: Tohatsu 25hp
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Posts: 99
What prop are you using? 25/30hp

Hi, need a new prop for Johnson 2s 30hp. At the moment I have a 10x15x3 on and having fitted a mini rev counter found only to be reaching 4700 at wot, on a bombard 380. That was with 3 up and 40l of fuel,,, plus a bit of gear.
Just would like to know what other 25/30 hp outboards are using on similar size sibs?

Know I need to go down a few pitchers, 10x11 or 10x12? 3 or 4 blade.

Have done lots of reading on the net but would like some fellow sib users advice.

Cheers Al.
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Old 28 May 2015, 15:45   #2
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Boat name: Salty Cheeks
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Quote:
Originally Posted by Big Al C View Post
Hi, need a new prop for Johnson 2s 30hp. At the moment I have a 10x15x3 on and having fitted a mini rev counter found only to be reaching 4700 at wot, on a bombard 380. That was with 3 up and 40l of fuel,,, plus a bit of gear.
Just would like to know what other 25/30 hp outboards are using on similar size sibs?

Know I need to go down a few pitchers, 10x11 or 10x12? 3 or 4 blade.

Have done lots of reading on the net but would like some fellow sib users advice.

Cheers Al.
Hi

What is your wot range.Really it needs to be you and lightly loaded boat
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Old 28 May 2015, 19:53   #3
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Country: UK - England
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wot is 5200 to 5800,
its not very often I'll be on my own, if I find its to low with a smaller pitch prop I can all ways put 10x15 back on.
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Old 29 May 2015, 05:42   #4
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wot is 5200 to 5800,
its not very often I'll be on my own, if I find its to low with a smaller pitch prop I can all ways put 10x15 back on.

Hi

You need to be in the WOT range preferably at the upper end mid way is ok.150 to 200 rpm raise or lower with each pitch.
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Old 29 May 2015, 09:38   #5
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We had a tohatsu 30 on the back of a 4.1m Surfcat, used a 10x13p mostly, couldve gone to 14p I think but 13 was good for allround
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Old 31 May 2015, 13:00   #6
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We had a tohatsu 30 on the back of a 4.1m Surfcat, used a 10x13p mostly, couldve gone to 14p I think but 13 was good for allround

Cheers for the reply, what sort of load did you have on.
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Old 01 June 2015, 06:48   #7
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Cheers for the reply, what sort of load did you have on.
Boat was about 76kg, 25l fuel tank, 20kg anchor and kit bag and usually two people with a combined weight of around 130kg

Would top out at 34 knots
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Old 23 June 2015, 11:35   #8
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Country: UK - England
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I have a 25hp Mercury 1981, with a new solas 13" pitch stainless on and it is a fantastic all round prop. Would highly recommend. Interestingly I did notice a significant drop in steering torque when I changed to the stainless prop. Not expected but definitely helpful.

So I would recommend a 10x13 stainless.

Matt
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Old 23 June 2015, 11:36   #9
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Sorry, just realised I failed to mention that I am running the 25 merc on a Bombard 380 aerotec as well. Plenty of power for a full load of people and scary (but fun) with one person!
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Old 23 June 2015, 15:58   #10
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Cheers for your info,,,,

Looking like 10x12 or 10x13. 3 blade.
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