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Old 13 May 2008, 15:53   #1
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Country: UK - England
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Boat name: Humper 2
Make: osprey vipermax
Length: 7m +
Engine: evinrude e-tec 250hp
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Posts: 74
which prop?

Hi, I have recently launched my new boat. Vipermax 7.5 with 250 etec. I wanted a 23" prop as I had this set up on my 7m Vipermax/250etec.and it proved to be a great all rounder. It was good out of the hole but could sometimes slip a bit.Top speed was good at 59mph.Ecomony was very good as we regularly saw around 1mile/litre when crusing. The trouble is the new etec has come with a 21" viper prop and 23" vipers are very hard to come by.
My engine supplier is being very helpful and has offered me various alternatives. A 23" 4 blade, a 22" viper or a 24". The 24" has to be rejected because of the potential slip problem.so it comes down to the 4 blade 23 or a 3 blade 22. I have got no experience of 4 bladed props so am struggling to reach an informed decision.The trouble is that I can`t try the 23/4blade as this will then become a used prop if I don`t like it and the dealer will lose out.I am tempted to go for the 22. Has anyone got an opinion on my choices?
Thanks
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Old 13 May 2008, 16:09   #2
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Oh 'eck. I was just about to mail Ian to enquire as to when my 23" might turn up. Mine also came with a 21", I asked Ian to keep it as there was no point in dragging it to Cornwall to send it back. Which 23" did you have on your previous boat?
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Old 13 May 2008, 16:27   #3
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Country: UK - England
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Boat name: Humper 2
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which prop

I had a 23" viper. It came recommended by Kris at Bruggemarine and he was adamant that it was the right prop. I was always happy with it although I did have the odd slip but I could`nt fault the overall usefulness of it,I spoke to Roger Swettenham(Ribster Rache)last week as he had both 21" and 23" props for his 7m vipermax/250etec. He reckons the 21 for extreme seas(in Roger speak extreme means effing ridiculous seas to the rest of us) and 23" for everything else in fact he now only uses the 23.
I know someone else who has a 7.5/250 etec who runs a 23 and is really happy with it. So anything else will not be as good. Given that 23 vipers are near impossible to get it`s going to come down to the 22 or 23/4blade i think.
Oh eck! indeed
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Old 13 May 2008, 16:36   #4
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How come the Viper 23's are so hard to get hold of?
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Old 13 May 2008, 16:58   #5
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which prop

Ian says they`ve stopped making them. Roger got his 2 years ago and it cost him 750quid and a lot of ringing around. I spoke to Kris today and he reckoned the 22 was the best option. But like everyone else he did`nt know much about the 23/4blade. He did`nt offer a 23" viper so I guess he can`t get them either.
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Old 13 May 2008, 17:08   #6
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4 blade props are great - you may lose a slight bit of top speed but you will get better grip.

There are plenty of other props on the market and a lot cheaper than those. Trouble is prop selection is such a black art I can understand why you want to stick with something you know works!!!
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Old 13 May 2008, 17:15   #7
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I've just mailed Steel Dev for an exact match with a Viper 23"
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Old 13 May 2008, 17:39   #8
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which prop

Quote:
Originally Posted by codprawn View Post
4 blade props are great - you may lose a slight bit of top speed but you will get better grip.

There are plenty of other props on the market and a lot cheaper than those. Trouble is prop selection is such a black art I can understand why you want to stick with something you know works!!!
Thanks for your opinion, do you know if there is a ratio difference ie 23/4blade = 22/3blade or could you have a 23/4 in place of a 23/3?
I once had a hi-five on a 150 opti it was dreadfull!
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Old 13 May 2008, 17:48   #9
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Quote:
Originally Posted by humper View Post
Thanks for your opinion, do you know if there is a ratio difference ie 23/4blade = 22/3blade or could you have a 23/4 in place of a 23/3?
I once had a hi-five on a 150 opti it was dreadfull!
No, 23 is 23 regardless of no. of blades. Four/five blades ( which I consider a little gimmiky) will give differing performance characteristics.

The gauge is, if the prop were passing through solid matter it would travel 23" in one rotation.
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Old 14 May 2008, 19:41   #10
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Why don't you look at the Evinrude Rebel Prop they do a 23" in that style.
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