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Folding prop on 320?

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Andre View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Andre Quote  Post ReplyReply Direct Link To This Post Topic: Folding prop on 320?
    Posted: 15 July 2018 at 20:36
Checked today. 
No wind, flat water, no tide/current, so water speed = ground speed.
At 2800 rpm, 6.3 knots, at 3600 rpm, 7.3 knots.
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Brufan View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brufan Quote  Post ReplyReply Direct Link To This Post Posted: 13 July 2018 at 13:07
On my H355, same speed with original vs FoF 2 blades prop except that now engine runs 3-400 rpm lower at same speed.
Reverse gear is as efficient as with orignal fixed prop.  Just anticipate 1 or 2 second when reversing.

Bruno

hanse 355 - 57

S/Y Spicy Ginger

White hull, 2 cabins, Volvo D1-30, Selden rig, removable mainsheet track system (modifications done now), Simrad-Jefa autopilot.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote aquilo Quote  Post ReplyReply Direct Link To This Post Posted: 13 July 2018 at 09:06
I've not noticed any decrease in max speed, but I seldom run the engine at max rpm, don't think that's healthy for it. What I noticed is that I got improved speed performance at lower rpm compared to the fixed. I think the top speed is appr. the same.



Edited by aquilo - 13 July 2018 at 09:09
Hanse 320
Norway
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Merinalle View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Merinalle Quote  Post ReplyReply Direct Link To This Post Posted: 13 July 2018 at 04:35
We have the 3-plade Flexofold, and the speed/RPM -numbers are quite similar Andre mentioned.
320#166
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Andre View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Andre Quote  Post ReplyReply Direct Link To This Post Posted: 12 July 2018 at 19:16
Should try it again, but can remember that at full throttle made a 7.2 knots.
And at 2800 rpm reach easily 6.3 knots, more or less comparable with the fixed prop.
Only noted that with fixed prop max. motor rpm was 3600 and with the folding one 3800, which is slightly overspeeding for the 3YM20.
Who is the dealer you are referring to?
Don't follow his arguments. Look around, you will  hardly find 32 ft boats with 3-blade folding props under it.
Mine was calculated, recommended and offered by Flexofold factory, which should have quite some commercial interest in offering the much more expensive 3-blade one, but didn't.
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mystudio View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mystudio Quote  Post ReplyReply Direct Link To This Post Posted: 12 July 2018 at 18:40
Talked with the dealer. Dealer is argumenting that with the 2-blade the optimal speed of the Hanse can't be reached. Is that true? With the fixed prop I'm doing around 7.2 to 7.3 knots. What do you guys doing with the 2-blade Flex-o-Fold? 


Hanse 320 | #004 | Jefa steering | Jefa DD1 drive | Raymarine EV-2 with P70 | Raymarine E7 | Simrad IS 20 multi and wind
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mystudio View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mystudio Quote  Post ReplyReply Direct Link To This Post Posted: 11 July 2018 at 20:54
With four positive reviews of the 2 blade version, I'm gonna ask for an offer for the 2 blade version. The 3 blade version is around 2k euro, my guess is that the 2 blade version is a lot cheaper. Thx for the responses. 

(dealers says that the stopping power of the 2-blade version is bad, however, if that was the case, you guys would have complaints about this. You don't so I guess he is mistaken). 
Hanse 320 | #004 | Jefa steering | Jefa DD1 drive | Raymarine EV-2 with P70 | Raymarine E7 | Simrad IS 20 multi and wind
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Mike2145 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike2145 Quote  Post ReplyReply Direct Link To This Post Posted: 11 July 2018 at 10:23
My 320 came with a 3 blade flexofold.  Excellent performance forward and reverse. Very smooth transition and good 'bite' in the water straight away. 
Absolutely no problems and really simple maintenance.  
Unfortunately I can comment on the performance of the 2 blade but I cant see that there would be a lot of difference.  The 3 blade may be a bit of overkill but if there is a considerable price differential then I suspect id go for the 2 blade given the comments above. 
Cant take a joke, don't buy a boat.
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mystudio View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mystudio Quote  Post ReplyReply Direct Link To This Post Posted: 10 July 2018 at 19:37
Well, this gives something to think about. Three happy 2 blade owners with no complaints about moving backwards or stopping with their 2 blade. I surely will check with the dealer why they think I should mount a 3 blade. Thx guys!


Hanse 320 | #004 | Jefa steering | Jefa DD1 drive | Raymarine EV-2 with P70 | Raymarine E7 | Simrad IS 20 multi and wind
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h315idra View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote h315idra Quote  Post ReplyReply Direct Link To This Post Posted: 10 July 2018 at 13:25
Hi,
on my 315 2006 I've Yanmar 30 with FoF 3 blades from the yard: it works very well.
I suggest  interesting test by Yacht Monthly
 
 
May be 3blades is too heavy - also if more equilibrate -  and may be 2blades do well the same job. Someone tell about some problem of opening in reverse (2blades).
Alessandro
Alessandro Camerini

315#526

Marina di Salivoli, Piombino ITALY
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