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Folding prop on 320? |
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Andre
Sub Lieutenant Joined: 26 March 2017 Location: The Netherlands Status: Offline Points: 7 |
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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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Merinalle
Captain Joined: 16 January 2007 Location: Finland Status: Offline Points: 288 |
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We have the 3-plade Flexofold, and the speed/RPM -numbers are quite similar Andre mentioned.
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320#166
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aquilo
Lieutenant Commander Joined: 09 September 2008 Status: Offline Points: 70 |
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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 |
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Hanse 320
Norway |
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Brufan
Rear Admiral Joined: 16 December 2010 Location: Belgium Status: Offline Points: 629 |
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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, Simrad (now B&G)-Jefa autopilot. |
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Andre
Sub Lieutenant Joined: 26 March 2017 Location: The Netherlands Status: Offline Points: 7 |
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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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mystudio
Captain Joined: 17 April 2018 Location: Netherlands Status: Offline Points: 157 |
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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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#004|Jefa DD1|ACU200|EV1|P70|Raymarine E7|Axiom Pro9s|B&G displays|Emtrak transponder|Lewmar traveller|Dyneema|Flexofold|Carbon pole|ball bearing genoacars|Membrame sails|Spi and asym spi|N2K->Wifi
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mystudio
Captain Joined: 17 April 2018 Location: Netherlands Status: Offline Points: 157 |
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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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#004|Jefa DD1|ACU200|EV1|P70|Raymarine E7|Axiom Pro9s|B&G displays|Emtrak transponder|Lewmar traveller|Dyneema|Flexofold|Carbon pole|ball bearing genoacars|Membrame sails|Spi and asym spi|N2K->Wifi
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mystudio
Captain Joined: 17 April 2018 Location: Netherlands Status: Offline Points: 157 |
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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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#004|Jefa DD1|ACU200|EV1|P70|Raymarine E7|Axiom Pro9s|B&G displays|Emtrak transponder|Lewmar traveller|Dyneema|Flexofold|Carbon pole|ball bearing genoacars|Membrame sails|Spi and asym spi|N2K->Wifi
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Brufan
Rear Admiral Joined: 16 December 2010 Location: Belgium Status: Offline Points: 629 |
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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, Simrad (now B&G)-Jefa autopilot. |
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Andre
Sub Lieutenant Joined: 26 March 2017 Location: The Netherlands Status: Offline Points: 7 |
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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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