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Lippe 
Commadore 
Joined: 05 September 2009 Location: Finland Status: Offline Points: 356 |
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 Posted: 16 June 2014 at 08:19 |
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Hi Alidal,
I bought two years ago flexo-o-fold to my Hanse 400 with 39hp Yanmar. Flexo-o-fold suggested 17x13-3 as good all round propeller. I chose 18x12-3 because I wanted focus on best possible thrust in manouvering and high seas. I quess there is not much difference in these two alternatives, but 17x13 may give a bit better speed. Alidal have you measured your speed with full rpm. I have just above 8 knots with 18x12. Kari Edited by Lippe - 17 June 2014 at 12:18 |
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alidal
Captain 
Joined: 30 September 2010 Location: Norway Status: Offline Points: 297 |
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Posted: 16 June 2014 at 09:03 |
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I tried when I changed 2 years ago, and then I get more speed with same rpm as with the fixed.
I am not sure aboutspeed at full rpm, but Y am sure it was over 8 knot. I had the same full rpm as with the fixed one.... Now I just have about 2600 rpm as max. (should be around 3000) I have had some water in the fuel. Maybe some issue with the fuelpump?
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Hanse 400#655
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Lippe
Commadore
Joined: 05 September 2009 Location: Finland Status: Offline Points: 356 |
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Posted: 17 June 2014 at 12:26 |
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Hi Alidal,
Note that I made some correction to figures in my earlier mail. Recommendation from flexofold was 17x13-3. It was said about your size: I"f you want low rpm at cruising speed, then go for the 17x14-3L and be aware of the fact that you will not be able to reach the rated maximum rpm." So according to this it is expected that your rpm stays below nominall for the engine. A member "Jesper" with H400 wrote as follwowing: If you order a 3-blade flexofold prop, remember to
get it with the right blades (17x14-3). I have just changes the blades on mine,
and increased the top-speed from 6,8 to 8,3. But most off all have I decreased
the rpm (including noise) at cruising speed (now 7 at 2100 rpm). Edited by Lippe - 17 June 2015 at 11:06 |
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sulutime
Commander 
Joined: 06 April 2006 Status: Offline Points: 96 |
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Posted: 17 June 2014 at 14:47 |
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Factory fitted Three blade Flex-o-fold on my H400e #157 2006 is 17x4 with the Yanmar 39hp and works wonderfully; good thrust against wavy seas or high wind and close to no lateral pull on reverse with very good efficiency when maneuvering. Recommended!
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Fabrizio H400e#127 Roma ITALY
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alidal
Captain
Joined: 30 September 2010 Location: Norway Status: Offline Points: 297 |
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Posted: 17 June 2014 at 16:19 |
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I have the 2-bladed. I guess there is a difference between the size of 2 or 3-blade?
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Hanse 400#655
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sulutime
Commander
Joined: 06 April 2006 Status: Offline Points: 96 |
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Posted: 22 June 2014 at 09:41 |
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Two blades have normally a longer pitch than three blades but less blade area. That gives a bit higher top speed on calm seas but substancially less push against waves or wind and when maneuvering.
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Fabrizio H400e#127 Roma ITALY
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avdbg
Sub Lieutenant 
Joined: 22 August 2010 Location: Netherlands Status: Offline Points: 9 |
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Posted: 03 July 2014 at 10:37 |
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This is what they advised me:
With a Yanmar 3JH5E (39 HP by 3000 RPM, reduction 1:2,32) we would recommend a 2-blade 17x14L or a 3-blade 17x13-3L propeller for your Hanse 400.
One would choose a 2-blade propeller because, in flat water, it will reach a higher speed for any given RPM. It will also have lower drag under sail and will cost less. The 3-blade Flexofold will perform better in maneuvers around the docks, in forward and reverse, will attain a higher average speed against a head sea, and will stop the boat quicker. The 3-blade may also be a little smoother running if there is a problem with vibration. The choice of 2-blade vs. 3 blade is really up to your personal preferences. |
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Publicschmidt
Sub Lieutenant
Joined: 10 August 2014 Location: Denmark Status: Offline Points: 4 |
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Posted: 10 August 2014 at 06:47 |
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Hi all,
We changed our Flex o fold from 18x12 to 18x14 and it works perfect. We are doing 8,6 kn. max and 7,1 at 2200 rpm. Best regards Lars Sailing Hanse 400e from 2006 in Denmark |
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alidal
Captain
Joined: 30 September 2010 Location: Norway Status: Offline Points: 297 |
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Posted: 10 August 2014 at 07:28 |
Is that a 2-bladed?
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Hanse 400#655
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samuel
Admiral of the Fleet 
Joined: 26 December 2004 Location: United Kingdom Status: Offline Points: 2770 |
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Posted: 10 August 2014 at 10:13 |
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Did you buy a new propeler?
I ask because a couple of weeks ago i spoke to one of the design team of the Brunton autoprop Although it is a self pitching prop it still has to be designed to set at the optimum pitch for the boat. To do this there is a bevel ( about 8 mm wide) on the rear edge of the blades. All they do is adjust the bevel & it sets he working pitch He then went on to say that they sometimes do a similar thing with fixed blade propellers, just grind a bevel on the rear edge to change the pitch. ( a trick of the trade) At that point he went off sailing so i could not ask anymore However, this raises a point. If one has a propeller with a pitch which is not quite right it may be possible to have it reworked & save the cost of a new one. Brunton sell all sorts & makes of propeller & it might be worth talking to them before investing in a completely new propeller, flexifold or otherwise I have been to their factory to have my prop serviced & they give the impression of being a proffessional & more importantly ,honest, outfit Edited by samuel - 10 August 2014 at 10:19 |
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Daydream Believer- Hanse 311- No GBR9917T- Bradwell Essex
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Publicschmidt wrote: