Folding propeller pitc etc.
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Forum Name: 325
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Topic: Folding propeller pitc etc.
Posted By: Fiona
Subject: Folding propeller pitc etc.
Date Posted: 09 December 2011 at 06:20
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Hi! What is the data on the std. fixed prop on the 325? What is the recommended pitch and size for a two blade folding? I am thinking 16X11x2 is that about right for the 325/320 with the 18 hp engine d1-20? Magnus
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Replies:
Posted By: Steen & Anne
Date Posted: 09 December 2011 at 08:08
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I would choose a feathering propel for the 325. It will give you the nessesary power in reverse and harbour manouvres. The 2-blade folding prop will only give you one advantage, and that's a marginal higher boatspeed ahead but none of the others. ------------- Former Hanse 342 owner - now racing a H-Boat |
Posted By: Windsurfer
Date Posted: 09 December 2011 at 09:33
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I also need advice on a folding prop...the feathering prop is out of my choice since we have too much debris and floating objects in the sea...I want it to be self cleaning since it freezes up my mind even to think about jumping in the 10 degrees C water... ------------- Hanse 320 #079 White hull, tiller, short keel and rudder, standard North sails, Sparcraft rig |
Posted By: Peter-Blake
Date Posted: 09 December 2011 at 09:41
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I have a 3 blade flexo fold on my Hanse 370. That was the best choice. It works perfect!
------------- Blake 370 
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Posted By: Fiona
Date Posted: 09 December 2011 at 14:07
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Well, back to the question... Which size and pitch? /Magnus
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Posted By: trist33
Date Posted: 09 December 2011 at 18:42
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Hi Fiona We have a 2 blade flex o fold for sail, replaced it with a brunton, the flex o fold only had about 60hrs use in one season. Pm me if ur interested ------------- "Discovery" Hanse 320 Brixham, UK |
Posted By: Windsurfer
Date Posted: 09 December 2011 at 21:09
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Trist, what was wrong about the flexofold??? Why did you replace it? ------------- Hanse 320 #079 White hull, tiller, short keel and rudder, standard North sails, Sparcraft rig |
Posted By: Brufan
Date Posted: 10 December 2011 at 07:22
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Last year I took a photo at Dusseldorf boat show of a H355 with a Flex-O-Fold fitted by the yard. The sticker on the prop shows 16 10 L. So size is 16, pitch 10, left handside. Size & pitch for a 325 is nearly the same. Hope it helps. ------------- Bruno hanse 355 - 57 S/Y Spicy Ginger White hull, 2 cabins, Volvo D1-30, Selden rig, removable mainsheet track system, Simrad (now B&G)-Jefa autopilot. |
Posted By: Windsurfer
Date Posted: 10 December 2011 at 08:44
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Thanks for the info Bruno...now I'm really confused...you talk about 16x10....gori proposed 16x11,5...flexofold offered 16x12 which they say is standard prop they deliver for Hanse 320... ------------- Hanse 320 #079 White hull, tiller, short keel and rudder, standard North sails, Sparcraft rig |
Posted By: holby
Date Posted: 10 December 2011 at 09:17
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Out of interest why is a folding prop "self cleaning". I would appreciate some info as to why a folding prop instead of a feathering in water with debris. Surely a fixed would be better and able to be relied on in water as has been described. I would gave thought both folding or feathering would give you the opportunity to visit the cold water. Thanks. ------------- Hanse 301, tiller steering, Volvo 2010 (10hp) 
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Posted By: trist33
Date Posted: 10 December 2011 at 12:00
Nothing was wrong with Flexofold really, we have a 30hp yanmar and wanted a 3 blade to compliment the engine, we went for a brunton which turned out to be the perfect choice, decreased fuel consumption, prop walk vanished, increased stability when motoring in rough conditions, overall improved boat crontrol and handling, all of this and it doesnt effect sailing speed.  http://www.myhanse.com/forum_posts.asp?TID=4971&title=3-blade-brunton-autoprop" rel="nofollow - http://www.myhanse.com/forum_posts.asp?TID=4971&title=3-blade-brunton-autoprop
------------- "Discovery" Hanse 320 Brixham, UK |
Windsurfer wrote:Posted By: Perttu
Date Posted: 10 December 2011 at 16:02
16*10 Flex-o-fold (2 blades) is bolt on with 355 and D1-20. 325 might be ok with slightly bigger prop as well. I would discuss with local sales agent about the details - they should be the pro's. See http://www.flexofold.com/%20" rel="nofollow - http://www.flexofold.com/ to download excellent test on various props... - Perttu |
Posted By: Fiona
Date Posted: 21 December 2011 at 15:38
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Ok, so the standard fixed 2 blade prop is 16X11. Was recomended by one dealer to stick with 16X11 and another to go up to 16X13 becuse the Hanse was a easy load. How ever when I was going against the wind with the standard prop. the speed was decreasing noticeably. Thatīs indicating that I would need even more torque, right? So going up in pitch would be a bad choice? Problem is I have a lack of experience since I just been on the virging trip from Greifswald to Sweden mostly by sail and wind from the rear... Whatīs your experience? /Magnus
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Posted By: Henrik84
Date Posted: 21 December 2011 at 17:45
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Hi. I havenīt noticed loss of speed when going against the wind. You also have to consider the speed of the water. Most of the times you will have the water comming towards you when going against the wind. I think my standard propeller is good. I donīt change before i really need it. Do I drive in 3000 RPM my boatspeed is about 5,8 - 6.4 kn. /Henrik ------------- S/Y LaRey Hanse 320 #430 Gothenburg, Sweden |
Posted By: Fiona
Date Posted: 21 December 2011 at 19:16
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Hi Henrik! 3000 rpm is the top rev. for the VP D1-20 (18hp) 5.8-6.4 kn does not sound like a very impressive top speed... even as SOG. what is the max rev on your engine? What is your march speed at say 2300-2400 rpm. ? If there is enough torque then it could be an idea to go up in pitch to get te speed up or the revs down. But if there is a struggle keeping speed against the wind then this is not an option... /Magnus
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Posted By: Henrik84
Date Posted: 21 December 2011 at 19:23
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My max rpm is 4500 rpm, crusing is 2500-3000 rpm.If I drive in 2300-2400 i have about 5-5.5 kn of speed. My top speed is about 7,1 kn. If i run at 2500-3000 rpm the fuel consumption is about 3l hour. 4000rm it is around 5-6l hour. I have Yanmar 3ym20 (21hp) /Henrik ------------- S/Y LaRey Hanse 320 #430 Gothenburg, Sweden |
Posted By: Windsurfer
Date Posted: 21 December 2011 at 20:56
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Henrik...you definitely have a wrong prop since max RPM on a 3ym20 yanmar engine should be 3600...my current fixed 2 blade prop allows the engine to rev up to about 3500 while moving the boat in calm weather at about 7,2-7,3 kts SOW...4500 is way too much...you prop is probably too light... ------------- Hanse 320 #079 White hull, tiller, short keel and rudder, standard North sails, Sparcraft rig |
Posted By: Fiona
Date Posted: 21 December 2011 at 21:00
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Ok! Evidently the Yanmar is a completly different animal vs. the VP. The drives have different gearing etc. so itīs hard to compare even if the hulls between 320 and 325 is simmilar. Cheers! Magnus
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Posted By: Henrik84
Date Posted: 21 December 2011 at 21:01
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I will try on sunday again, but I meet another 320 owner this summer, and it was the same for him. The RPM display goes up to 5000 rpm. I for sure have alot of barnacles on my prop now but will try anyway. /Henrik ------------- S/Y LaRey Hanse 320 #430 Gothenburg, Sweden |
Posted By: Windsurfer
Date Posted: 21 December 2011 at 21:12
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I once had some severe barnacle layer on top of my prop...I couldn't push the boat any faster than 4,5 kts while it was vibrating like a production crushed stone coarse screen... I can't believe the 3ym20 can rev up to 5000...with that kind of RPM the pistons could probably outrun the valves and eventually hit and bend them...I think it could be just the incorrect tach reading...otherwise it really looks like a mirracle for me... ------------- Hanse 320 #079 White hull, tiller, short keel and rudder, standard North sails, Sparcraft rig |
Posted By: Peter-Blake
Date Posted: 22 December 2011 at 07:39
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As far as i remember is the max rev for the Yanmar 3ym30 and 3ym20 3600! You will find it in your manual. 5000 rev is i think impossible without damaging the motor. Maybe your rpm display is working wrong ------------- Blake 370
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Posted By: Henrik84
Date Posted: 22 December 2011 at 08:14
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They said to me at the yard when i got my boat that crusing speed is between 2300-3000 rpm. If i drive in 3000rpm and pull the handle in bottom there will be a huge different in speed. /Henrik ------------- S/Y LaRey Hanse 320 #430 Gothenburg, Sweden |
Posted By: Peter-Blake
Date Posted: 22 December 2011 at 09:27
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Your motor has the most power at 3600 rpm. But that is not a crusing rpm for a long time! If you run your motor with 4500 or 5000 rpm (i am not sure the motor is able to do this), than your boat will end like Johans boat on this foto or like my avatar:    ------------- Blake 370
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Posted By: Windsurfer
Date Posted: 22 December 2011 at 09:31
Maybe Henrik runs his engine on high octane gasoline??? 7,1 kts is way too slow for his F1... ------------- Hanse 320 #079 White hull, tiller, short keel and rudder, standard North sails, Sparcraft rig |
Posted By: JesperK
Date Posted: 04 January 2012 at 15:56
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Hi,
My 325 was supplied with a 17x12 2-blade folding prop from Radice for the D1-30 engine. So, for the D1-20, something smaller would be suitable. 16x11 is definitely in the right direction. If you Google a bit on this topic, you will find numerous discussions. Based on some limited research, I concluded that 17x12 was approximately right for our 325 with the installed engine size. Propeller size and pitch selection does not appear to be an exact science.
Which one did you choose?
/Jesper
------------- Hanse 325 |
Posted By: Fiona
Date Posted: 04 January 2012 at 22:34
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Hi Jesper! Still undecided but I lean towards the Radice 16X11 two blade. Since the original prop is 16X11. Thinking of buying next year and have a go with the fixed one to see how it performes. Cheers! Magnus
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Posted By: Fiona
Date Posted: 25 January 2012 at 13:01
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I found a used VP two blade folding 16X11 for 200 on the internet. Since it was close to where I live I picked it up. If it proves to be the right pitch I will stick to it. If not Iīll buy another one for next year. Time will tell... /Magnus
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Posted By: Fiona
Date Posted: 19 May 2012 at 17:08
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The used
VP two blade folding 16X11 worked perfectly! 6 kn @ 1800-2000 rpm. /M
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