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Old 23 June 2013, 03:58   #1
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Optimax 115 Propeller size?

Morning, looking to get my boat out on the water for the first time this week (if the weather behaves) but need to purchase a prop as the one I got with the engine is kn$%kered! I have never put this boat in the water before so have no starting point and have also tried the mercury propeller selector which was advising me to get a 12" pitch which I believe is to small as I was thinking about a 19" pitch. My specs and usage are as follows:

Engine: Year 2000 optimax, V6 115Hp
Boat: 6m humber destroyer
Total Weight: 900 - 1000kgs
Usage: Mid range cruising and top speed

Has anybody got any recommendations for pitch and diameter size I should go for that would suit the above requirements?

Thanks
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Old 23 June 2013, 04:47   #2
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19" sounds a bit high, I'd have thought 15-17" depending on your loadings. You don't want to be overpropped. I'd try & borrow a 17" stainless & work from there.
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Old 23 June 2013, 12:43   #3
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I've got a 6.2m with 115hp and my prop is 13.25 diameter with 17 " pitch. Works well for me giving 33 knots with a family and kitchen sink loaded and just bought a new spare aluminium for about 100.
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Old 23 June 2013, 12:49   #4
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Quote:
Originally Posted by whackywoody View Post
Morning, looking to get my boat out on the water for the first time this week (if the weather behaves) but need to purchase a prop as the one I got with the engine is kn$%kered! I have never put this boat in the water before so have no starting point and have also tried the mercury propeller selector which was advising me to get a 12" pitch which I believe is to small as I was thinking about a 19" pitch. My specs and usage are as follows:

Engine: Year 2000 optimax, V6 115Hp
Boat: 6m humber destroyer
Total Weight: 900 - 1000kgs
Usage: Mid range cruising and top speed

Has anybody got any recommendations for pitch and diameter size I should go for that would suit the above requirements?

Thanks


Engine: Year 2000 optimax, V6 115Hp. In line 3 isn't it? Or is it not a 115hp?
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Old 23 June 2013, 12:59   #5
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Originally Posted by nugent View Post
Engine: Year 2000 optimax, V6 115Hp. In line 3 isn't it? Or is it not a 115hp?
Its an early one and not sure they were that common. Its a 2.5L V6 (got 6 spark plugs as I have been through the expense of changing them all ) and is definitely 115Hp (wish it had more horses)
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Old 23 June 2013, 15:20   #6
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Quote:
Originally Posted by whackywoody View Post
Its an early one and not sure they were that common. Its a 2.5L V6 (got 6 spark plugs as I have been through the expense of changing them all ) and is definitely 115Hp (wish it had more horses)

That's a big block for just 115hp, are you 100% sure?
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Old 23 June 2013, 15:23   #7
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That's a big block for just 115hp, are you 100% sure?
Yep me thinks its a 135 sir with different hood
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Old 23 June 2013, 15:51   #8
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V6 115 !! well our 125 is a 3 pot !!! I'm with nugent on the numbers !!
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Old 23 June 2013, 15:58   #9
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It's not often you ask for prop advice and get a bigger engine. Score!

Of course, your insurance is shot...
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Old 23 June 2013, 16:02   #10
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Hi, I have one of these (115) on a 6m destroyer. Definitely 3 cylinders..... I'm running a 17 pitch after much chopping and changing! Works extremely well (35kts ish) with 4 divers and kit at about 5000rpm.
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