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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: 03 October 2018 at 19:01
I keep the old fixed blade prop onboard as emergency spare, don't know what size it actually is but could be indeed bigger than the folding one I have today. I can only check later. I Always found it quite big anyway and wouldn't be surprised it was also installed/delivered on the Hanse 350 at that time. At full throttle the engine tended to slighty smoke so prop simply could be a bit too big for a Hanse 320 purpose.
I don't experience issues when motoring in a chop with the 2-blade and if one experiences pulsating prop wash it can be explained by the difference in resistance the hull and prop are experiencing  in such conditions by which also the thrusting force will pulsate. The prop thrust will variate with the resistance the boat experiences in a chop, it is not constant then.
Still am quite impressed and pleased about the performance, also in reverse. 
And also when sailing!
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samuel View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote samuel Quote  Post ReplyReply Direct Link To This Post Posted: 03 October 2018 at 09:44
Nobody has mentioned performance in heavy chop. Perhaps the 3 blade would have better drive then. With a 2 blade the prop may have a tendency to cavitate or "pulse " as it goes over the waves.  With my prop i know that if  I look over the stern I can sometimes see the water eject in pulsing motions rather than continuous streams as the boat stops as it hits a wave. I have an Autoprop so that may explain it but a friend with a folding prop gets the same thing.
It may be that a 3 blade would help in these situations giving better drive through the waves rather than a stop go motion
Daydream Believer- Hanse 311- No GBR9917T- Bradwell Essex
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Carlosailfan View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Carlosailfan Quote  Post ReplyReply Direct Link To This Post Posted: 03 October 2018 at 09:13
Small update

 Nina Tonnesen Von Bergen <nvb@flexofold.com
Best regards
/C
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Carlosailfan Quote  Post ReplyReply Direct Link To This Post Posted: 03 October 2018 at 09:08
I asked Flexofold factory directly and they confirmed the fact that you can not compare it 1 to 1.
so if you have doubts, ask them. I had the same issue :)

Best regards
/C
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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: 03 October 2018 at 07:27
Today I dismountend the old prop to change it with the new one. What I didn't expected; the old prop is a 16x13 prop! Were you guys aware of that? So, now I am replacing the 16x13 fixed with a 16x12 folded. Hm, didn't see that one coming. Maybe I should change the blades for 16x13, because I do like the performance of the fixed prop. 

Was the 16x13 prop standard on the 320? 

Hanse 320|#004|Jefa steering |Jefa DD1 drive|Raymarine EV-2 with P70|Raymarine E7 |B&G Triton1 Multi displays|Lewmar size 2 traveller|Dyneema|Flexofold|
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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: 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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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brufan Quote  Post ReplyReply Direct Link To This Post 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.
Bruno

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White hull, 2 cabins, Volvo D1-30, Selden rig, removable mainsheet track system (modifications done now), Simrad-Jefa autopilot.
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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 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. 
Hanse 320|#004|Jefa steering |Jefa DD1 drive|Raymarine EV-2 with P70|Raymarine E7 |B&G Triton1 Multi displays|Lewmar size 2 traveller|Dyneema|Flexofold|
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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: 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. 

Hanse 320|#004|Jefa steering |Jefa DD1 drive|Raymarine EV-2 with P70|Raymarine E7 |B&G Triton1 Multi displays|Lewmar size 2 traveller|Dyneema|Flexofold|
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mystudio Quote  Post ReplyReply Direct Link To This Post 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! 
Hanse 320|#004|Jefa steering |Jefa DD1 drive|Raymarine EV-2 with P70|Raymarine E7 |B&G Triton1 Multi displays|Lewmar size 2 traveller|Dyneema|Flexofold|
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