Griiffon propeller

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cpbarton
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Griiffon propeller

Post by cpbarton » Wed Nov 08, 2017 9:39 am

hello,
I am about to replace the 38 year old Volvo md7 engine with a Beta 20 hp 3 cylinder. This will require a new prop.
Please can you advise me on the best prop to go for; 2 or 3 blade? fixed or folding. What size blades?
I currently have an expensive Gory 3 blade folding prop.
Also take into consideration fitting an efficient rope cutter. one could not be fitted to the Gory prop that would actually work due to the distance from the blades.
I look forward to receiving some interesting advise, please.
Chris

Jolly Roger
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Re: Griiffon propeller

Post by Jolly Roger » Wed Nov 08, 2017 12:26 pm

Chris

Welcome to the Westerly Owners Association Forum.

Your choice of a Beta engine is an excellent choice. Fixed propellers are cheaper than folding propellers, but create a lot of drag. So if you like to sail faster and further, then choose a folding propeller. The choice of 2 or 3 blades depends on the clearance between the hull and the propeller. Your best bet is to have a chat with Sillette - suppliers of Gori and Radice propellers. They should be able to advise your best choice of what to fit, their advice is free.

The best rope cutter comes from Ambassador Marine, and that would be my choice. You may need to check you have sufficient clearance between the P-bracket and the boss to fit one. So it may mean a new propeller shaft.

I would check the cutlass bearing for wear and consider fitting a water lubricated shaft seal as well.
Roger
Concerto Fulmar FR38
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philipstevens
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Re: Griiffon propeller

Post by philipstevens » Wed Nov 08, 2017 5:59 pm

I would not go as far as Jolly Roger in saying
The best rope cutter comes from Ambassador Marine
as PBO did a test on rope cutters a few years ago, and they came up with a dead heat between Ambassador and Spurs http://www.haroldhayles.co.uk

See https://www.youtube.com/watch?v=JImiuemabIY for some guidance.

You "pays' your money and takes your choice".

I have had both Stripper and Spurs cutters on my boats, and both did their duty (shamefaced as I am to say) when I went over ropes.
regards,
Philip.
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Previous owner of Konsort Duo, Oyster, KD22

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steve parry
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Re: Griiffon propeller

Post by steve parry » Thu Nov 09, 2017 5:17 pm

Hi,

I would go for SPURS every time, as Philip says not much between them on the tests etc but the RNLI tend to use Spurs on their boats and that's good enough for me!

There may be a cost difference between the two plus the cost of spares etc.

Regards

Steve Parry - WALKABOUT

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Re: Griiffon propeller

Post by Hillary » Sat Nov 11, 2017 7:08 pm

I Put a Beta 20 into my Centaur and I also had to replace the prop. After lots of research I went with a Darglow Featherstream 3 Bladed prop. The Darglow technical support staff were brilliant in helping to match the prop to the engine and boat. The result has been a huge improvement. Prop walk is a thing of the past and I get an extra half a knot or more when sailing. The only downside is that you have to grease the prop hub once a year. I put an ambassador rope cutter on and I don't know if it has worked or not but I have not had any problems. Be careful fitting them they are sharp!

Hillary
Moonshine, Centaur CR1149

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