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Folding prop on 320?

Printed From: myHanse.com
Category: Hints and Tips
Forum Name: 320
Forum Description: 320 Hints and Tips
URL: http://www.myhanse.com/forum_posts.asp?TID=10884
Printed Date: 21 September 2018 at 23:15
Software Version: Web Wiz Forums 11.04 - http://www.webwizforums.com


Topic: Folding prop on 320?
Posted By: mystudio
Subject: Folding prop on 320?
Date Posted: 07 July 2018 at 08:56
I'm considering the Flexofold 3 blade 16x11 folding prop on my 320. Has anyone experience (good or bad) with this prop on the 320? Mine has the 3ym20 motor with the SD20 saildrive. 



Replies:
Posted By: aquilo
Date Posted: 07 July 2018 at 09:19
I have the 16 x 12 2 blade on my 320. Better forward than the original fixed 2 blade and working very well backwards. On such small boat/motor I believe it might not be so much to gain installing a 3 blade.

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Hanse 320
Norway


Posted By: Brufan
Date Posted: 07 July 2018 at 11:38
I have a Flex-O-Fold 2 blade 16 X 12 (? not sure) L on my Hanse 355.
2 blades prop are surely efficient enough for a H320


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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.


Posted By: mystudio
Date Posted: 09 July 2018 at 07:30
Thx for your replys. This surely does give new insights. Dealer says I have to go for the 3 blade because the 2 blade 'wouldn't perform backwards'. If I hear you guys, it does and both of you say a 3 blade isn't necesarry. Thx!



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Hanse 320 | #004 | Jefa steering | Jefa DD1 drive | Raymarine EV-2 with P70 | Raymarine E7 | Simrad IS 20 multi and wind | Lewmar size 2 traveller


Posted By: Andre
Date Posted: 09 July 2018 at 21:22
I have the new design 2-blade Flexofold 16 x 12 with the large hub and big anode on our 320. Same as the new composite hub design,  but then in all-bronze.
Should have bought one years ago. Ample power ahead and very silent, no noise when engaging forward and reverse. No feeling this is a folding prop at all. In reverse you may need to increase the motor speed a bit more than you are used to with a fixed prop, but it is for sure powerful enough. The "singing" noise of the fixed prop we experienced is finally gone.
Believe the 3-blade is overkill and is besides quite a bit more expensive (and is maybe why the dealer recommends it...).
Though the biggest smile you will have on your face is when sailing with the folding prop….. Up to 0.3 - 0.4 knots better performance up-wind, no vibrations anymore on the rudder, what a relieve!


Posted By: h315idra
Date 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
https://www.yachtingmonthly.com/archive/the-ultimate-propeller-test-video-11550" rel="nofollow - https://www.yachtingmonthly.com/archive/the-ultimate-propeller-test-video-11550
 
https://www.yachtingmonthly.com/gear/folding-and-feathering-propeller-test-29807" rel="nofollow - https://www.yachtingmonthly.com/gear/folding-and-feathering-propeller-test-29807
 
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


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Alessandro Camerini

315#526

Marina di Salivoli, Piombino ITALY


Posted By: mystudio
Date 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!




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Hanse 320 | #004 | Jefa steering | Jefa DD1 drive | Raymarine EV-2 with P70 | Raymarine E7 | Simrad IS 20 multi and wind | Lewmar size 2 traveller


Posted By: Mike2145
Date 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. 


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Cant take a joke, don't buy a boat.


Posted By: mystudio
Date 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). 


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Hanse 320 | #004 | Jefa steering | Jefa DD1 drive | Raymarine EV-2 with P70 | Raymarine E7 | Simrad IS 20 multi and wind | Lewmar size 2 traveller


Posted By: mystudio
Date 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? 




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Hanse 320 | #004 | Jefa steering | Jefa DD1 drive | Raymarine EV-2 with P70 | Raymarine E7 | Simrad IS 20 multi and wind | Lewmar size 2 traveller


Posted By: Andre
Date 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.


Posted By: Merinalle
Date Posted: 13 July 2018 at 04:35
We have the 3-plade Flexofold, and the speed/RPM -numbers are quite similar Andre mentioned.


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320#166


Posted By: aquilo
Date 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.



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Hanse 320
Norway


Posted By: Brufan
Date 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.



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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.


Posted By: Andre
Date 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.


Posted By: mystudio
Date Posted: 19 July 2018 at 08:40
Will check it today on my boat with the Original fixed prop, but I think it's more or less the same. So, I don't see any reason to go for the 3-blade anymore and assume the shipard is wrong on this one. Thx all for the input! 

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Hanse 320 | #004 | Jefa steering | Jefa DD1 drive | Raymarine EV-2 with P70 | Raymarine E7 | Simrad IS 20 multi and wind | Lewmar size 2 traveller


Posted By: mystudio
Date Posted: 02 September 2018 at 19:13
Ordered and received my prop, curious! Very heavy, by the way. 

Checked my boatspeeds on flat water with the old propellor, here is my 'old' tab:

2000 5,4
2400 6,2
2800 6,7
3000 6,9
3200 7,0
3400 7,2

More or less the same as the experiences here. Will do the same test with the new propellor. 



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Hanse 320 | #004 | Jefa steering | Jefa DD1 drive | Raymarine EV-2 with P70 | Raymarine E7 | Simrad IS 20 multi and wind | Lewmar size 2 traveller


Posted By: mystudio
Date Posted: 10 September 2018 at 19:59
One consideration. Andre, don't you think the prop is quite heavy? Did not weight it yet, but, it's heavy! Asking myself if this is okay for the bearings in the saildrive….will ask Flexofold too for there experiences. 

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Hanse 320 | #004 | Jefa steering | Jefa DD1 drive | Raymarine EV-2 with P70 | Raymarine E7 | Simrad IS 20 multi and wind | Lewmar size 2 traveller


Posted By: Brufan
Date Posted: 11 September 2018 at 10:00
Unitl now : no problem with SD bearings (approx 550 running hours with it).
Yes FoF is heavy.  But other folding or feathring propelers are also heavy.


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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.


Posted By: Andre
Date Posted: 11 September 2018 at 21:24
Prop is heavy indeed, I was also impressed by its weight, but it will be a bit lighter under water (Archimedes). Expect the thrust force of the prop will be considerably higher than the radial force by its weight, bearings should easily withstand the weight of the prop. As Bruno also notes about all folding props are in alu-bronze, weights will not be much different between brands and a 3-blade version will even be heavier. Only folding prop that will be considerably lighter I believe will be the same Flexofold with the composite hub construction, which is about Euro 100 more expensive.
Wouldn't worry about the  prop weight, enjoy the better sailing performance instead!



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