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Folding Propeller for Hanse 540

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Anders View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Anders Quote  Post ReplyReply Direct Link To This Post Posted: 28 June 2007 at 11:39

Hi All

 
I have changed the propeller from Volvoo 4 blade to Gori 22 x 16.
There is no shaft rotation problem. The overdrive works very well. At around 2500 RPM i get 8,5 knots.  I estimate around 9 on full speed (3000 RPM without overdrive).
 
I have a volvo enginge on the 540 with hydraulick transmission. I experience much less port propeller draft with the gori compared to the volvo prop, however the volvo probably had a smoother ride on high RPM than the Gori. Irrespective GORI is they way to go and I do not regret for a moment changing.
 
I am very disappointed with Volvo not accepting to return the propeller i bought. The alterntive would probably be - 4 blade volvo, shaft rotation problem- damage transmsission and warranty issues.
 
In sum, of the options considered- GORI
 
 
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taduka View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote taduka Quote  Post ReplyReply Direct Link To This Post Posted: 28 June 2007 at 14:32

Guys

I have just installed a Gori 2 blade racing propeller on a Hanse 370 - it's simply awesome! 8 knots at 2700! very smooth! Send me a PM if you need more info or pictures
 
Will soon be installing a 3 blade Gori on a 430. Will report back on performance. 
 
Shawn


Edited by taduka - 28 June 2007 at 14:32
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ChristianDK View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ChristianDK Quote  Post ReplyReply Direct Link To This Post Posted: 02 July 2007 at 20:39
Hi Anders...
 
What's the reason for installing Gori 22x16 and not 24x16 as you wrote you were going to in a earlier post?
We are runing with 24x16.
 
Best regards Christian
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ZENYACHT View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ZENYACHT Quote  Post ReplyReply Direct Link To This Post Posted: 09 June 2008 at 04:58
Dear Hanse owners

After one year of using the GORI in my 531 I will NOT recommend this prop to anyone.

We cant reach the hull speed. 8,6 at top in overdrive and only 7,6 in normal pitch in a 50 plus footer waterlenght? Something is very wrong

We had

100 hp Yanmar with a 2 62 ratio 3800 rpm

A 20 by 16 GORI...... the size they recommend although I have insisted in my opinion that was undersized to GORI plant.

The prop walk in reverse is terible.

In overdrive there is shaft vibration.

We have refitted the AUTOPROP and reffited the whole shaft, although I also do not recommend this propeller to anyone.

Has anyone tried a FLEX O FOLD?

Thanks for the feedback

jose

Edited by ZENYACHT - 09 June 2008 at 05:06
ZENCAP
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Anders View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Anders Quote  Post ReplyReply Direct Link To This Post Posted: 09 June 2008 at 07:34
Hi
 
I cannot say I share your opinion  regarding the Gori propeller on my H 540. I changed from volvo 4 blade to a Gori. At 1500 RPM it runs excess of 7,5 knots, at 2000 about 8,5 knots. With my volvo 110 hk, I get about 2500 RPM in overdrive and 3100 with normal use. 
 
best regards


Edited by Anders - 09 June 2008 at 07:35
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ZENYACHT View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ZENYACHT Quote  Post ReplyReply Direct Link To This Post Posted: 09 June 2008 at 14:20
Dear Anders

You have another engine the new Volvo 110 hp D3 runs at 3000 rpm My Yanmar 100 hp runs at 3800 rpm.

3000 Rpm is a much better option as you can use a bigger prop which boost efficency with less blade cavitation at topping rpms.

Anyhow look that your 540 is not reaching the hull speed which should be 9,2 knots for 50 footer waterlenght.

Lets say the near hull speed is 9 knots. You should reach that speed at 80-85% of top engine rpm i.e. at around 2500 rpm in normal pitch .

That is optimal engine loading according to the engine manufacturer specs.

In overdrive you should reach near hull speed at a lower rpms maybe 50% of top but you can only use this mode while motorsailing or following the stream. Otherwise the propellers slips and the shaft vibrates due to the overpitching.

The 0,5 knots that you are missing is probably due to two factors as far as I researched.

First the blade size or BAR (Blade Area Ratio) is very low on the GORI that leads to low efficiency.

Second the 531/540 skeg deadwood is very wide and blunt creating heavy turbulence on its trailing edge. Each blade finds a counterpresure as coming vertical and facing the skeg deadwood. That leads to a loss of efficency and enhances cutlass bearing wear and vibration on the shaft.

Look at the pic and compare the skeg deadwood size compared to the blade width

As a final comment I would let you know that we have to face a F8 sudden storm last November, and while lowering the main   I barely was able to control my 531 at 2500 rpms facing the wind we were doing only 0.5 knots SOG with the Gori. The prop was probably in overdrive

A good book for the layman ( as myself ) is the "Propeller Handbook" by Dave Gerr, were propeller concerned sailors can find a good reference source and lots of information. I have really enjoyed the reading of this book.

But if you are happy with your GORI that is ok. 8,6 knots is still a decent speed but remember that you are in overdrive and not in normal pitch mode, and I won't try to head seas on the engine in overdrive

For many coastal sailors in windy areas propellers or efficency is not an issue as for the opposite on long passages in the med sea (were in summer the only wind you have is the apparent created by your engine).

Good sailing

Jose

















Edited by ZENYACHT - 09 June 2008 at 14:39
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ZENYACHT View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ZENYACHT Quote  Post ReplyReply Direct Link To This Post Posted: 09 June 2008 at 14:49
Dear Fellows

i forgot to remark i have been recommended a 20 by 16 by Sune Ehrenskjöld at GORI plant in Denmark. as you see you are wearing a bigger GORI

I told Mr Ehrenskjöld that following my calculations a 22 was a much better option, I Followed his advice and now I have a GORI 20 x16 For sale

Anyone interested?

Good sailing
Jose
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Post Options Post Options   Thanks (0) Thanks(0)   Quote panos Quote  Post ReplyReply Direct Link To This Post Posted: 11 June 2008 at 20:18
Hi,
 
IMHO whoever wants a good motoring prop should install a fixed 4 blade. Sailors using the engine to motor in and out of harbor and occasionally motoring (at low speeds) when there is no wind should get a racing GORI. All others (including the 3 blade GORI) are a in between solution. To get excellent or good sailing you sacrifice motoring. Hull speed is a theoretical number depending on waterline length only. The actual speed depends between others on displacement, shape and surface condition and engine power.
Reversing: Prop walk is very predictable and if after getting used to it, is a huge help to me to enter tight spots without the bow thruster. And if you have some min speed the boat goes exactly where you want. If you want to turn on the spot you just give short bursts of power- the boat just turns before it starts moving.
I am for GORI 100%.


Edited by panos - 11 June 2008 at 20:25
Panos

Hanse 630e - selling her -
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H4 Marine View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote H4 Marine Quote  Post ReplyReply Direct Link To This Post Posted: 18 July 2008 at 13:54
The darglow featherstream is a very nice piece of engineering, I will have one on my next boat.
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ZENYACHT View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ZENYACHT Quote  Post ReplyReply Direct Link To This Post Posted: 06 September 2008 at 14:49
Panos

Good for you.

Maybe after one season of using a Gori you may want to recall this post.

ZENCAP


Originally posted by panos panos wrote:

Hi,
 

IMHO whoever wants a good motoring prop should install a fixed 4 blade. Sailors using the engine to motor in and out of harbor and occasionally motoring (at low speeds) when there is no wind should get a racing GORI. All others (including the 3 blade GORI) are a in between solution. To get excellent or good sailing you sacrifice motoring. Hull speed is a theoretical number depending on waterline length only. The actual speed depends between others on displacement, shape and surface condition and engine power.

Reversing: Prop walk is very predictable and if after getting used to it, is a huge help to me to enter tight spots without the bow thruster. And if you have some min speed the boat goes exactly where you want. If you want to turn on the spot you just give short bursts of power- the boat just turns before it starts moving.

I am for GORI 100%.
ZENCAP
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