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jebe View Drop Down
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Joined: 13 April 2004
Location: Sweden
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jebe Quote  Post ReplyReply Direct Link To This Post Posted: 12 October 2004 at 20:32

Hi Susane,

What more is stamped on the prop? 15L is the diameter and the rotation direction (Left). I guess that 15 inch dia is OK. The pitch is more importent. Acc to Flex-o-fold 1 inch makes about 400-500 rpm. What RPM does it with full throttel? Does it go into speed limmit (max speed +5% acc to Yanmar Sweeden). What engine do you have? My suggestion is that you contact Flew-O-Fold in denmark for a recomendation. I use to have a Comfortina 32 with a 22 years old 17 hp Volvo and a 2 blade folding, cruising speed 6 knot, max speed 6,6 knot, so 5,2 sounds low. I also met a guy in sweeden this summer who was very dissapointed with the engine speed of his 312 with a 3-blade flex-o-fold. But as I wrote earlier. The problem is NOT Flex-o-fold, the problem is yachtzentrum and their way of sizeing the prop.

It's sad on such good boats, engings and prop's not to get the performance you can get...

Attached you can find what Yathzentrum planned regarding props early this spring.2004-10-12_201611_Flex-O-Fold_Propeller_Übersicht_Yanmar.xls

 

Jesper

 

Jesper
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susie View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote susie Quote  Post ReplyReply Direct Link To This Post Posted: 12 October 2004 at 20:52

Hejsan Jesper,

Tack för svaret.

How do I check the pitch?  It it also stamped on the propeller somewhere?Question

 The enginge is Yanmar 2GM, 18 hp.  I have never really tried full trottle for more than a few minutes..

Susanne

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jebe View Drop Down
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Joined: 13 April 2004
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jebe Quote  Post ReplyReply Direct Link To This Post Posted: 12 October 2004 at 21:37

Hej Susanne,

On my blades 16L is marked in the casting (a "positive mark") and on the machined surface there is a "punch marked" 0. I guess this zero means 10 (but there is only space for on digit). If yours are marked 8 I guess it´s 8 inch (8 was the value from the table for the 18 ps on 311. I guess that they use the same casting for different pitchis of the same diameter.

I will call Flex-o-fold this week and ask how to find out the pich. I´ll post a reply when I know.

When you tested full speed, what RPM and speed did you get?

 

Jesper
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Eternal Flame View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Eternal Flame Quote  Post ReplyReply Direct Link To This Post Posted: 13 October 2004 at 10:15

 Oh yeah a new problem...... I have fixed a original folding prop (with a volvo engine) from Volvo Penta. It is a 2 bladed one with annodes. I really don't feel any chance in power. Nore fuelconsumption. The only thing that is different is when motoring backwards. It takes a little more time to stop and go backwards but he...?? if you are used to it who cares? And sailing whow.....that goes faster than with fixed prop!! There goes my first place in the next Hanse Nederland race.....

When sailing you have to put the box in reverse and there is absolute silence!! Yeah this is great and the costs are beareble. This instead of the beautifull and 3 bladed gori.

Buy the 2 bladed and keep some chance in your pocket to by a Genoa or a gennaker!

Frank - Eternal Flame

 

Happy Sailing you all!
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jebe View Drop Down
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Joined: 13 April 2004
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jebe Quote  Post ReplyReply Direct Link To This Post Posted: 13 October 2004 at 11:05

Hi Susanne,

I just talked to Capella marin in Stockholm. They confirmed that the punchmarked "0" means 10 inch pitch. Check yours. They also made me an calculation and came out with a recomendation of a 16*12-3L prop (instead of the delivered 16*10-3L). This will give between 7,6 and 8 Knot @3600 rpm (full trottle) and a nice cruising speed 6-6.5 knot @ 2500 RPM. I will trye to get the sweedish dealer to replace my blades.

I suggest that you contact your Flex-O-Fold dealer in Finnland for a proper prop calculation and the talk to Sami at Hanse Finnland.

 

Jesper
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Stella*Nova View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Stella*Nova Quote  Post ReplyReply Direct Link To This Post Posted: 13 October 2004 at 11:21

Hi, I have the Yanmar 3YM30 installed at my 341 and with the Flox-O-Fold I have the same issue. Full speed the boat makes 7.6-7.8 kts but the rpm is over 4000! I think that should be no problem for the engine but it needs a lot of fuel. Much better would be max. 3600 rpm when full speed.

I'm not shure if the rev-meter works exact. My feeling is that it shows too much rpm's.

Has anyone an idea how to check the rev-meter?

Kind regards

Ralf - Stella Nova

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susie View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote susie Quote  Post ReplyReply Direct Link To This Post Posted: 13 October 2004 at 14:46

Hi,

Thanks for the info.. I'll go and check my propeller.

Susanne

 

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franko View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote franko Quote  Post ReplyReply Direct Link To This Post Posted: 11 December 2004 at 10:21

Ralf,

You can buy a small hand Tachometer for about £30 in the UK

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