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Folding Propeller

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High Time View Drop Down
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Joined: 04 September 2012
Location: Portsmouth UK
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Post Options Post Options   Thanks (0) Thanks(0)   Quote High Time Quote  Post ReplyReply Direct Link To This Post Posted: 22 July 2021 at 14:26
Originally posted by Matt1 Matt1 wrote:

I can’t comment on a 388 but I swapped the std x2 blade fixed prop for a x3 blade flex o fold on my 418 and as expected it was transformational - both under sail and power. Under power it provides increased top speed and cruising speed, more power into a head sea and wind, and better close quarters handling. can’t recommend it enough 

Hi Matt
I'm curious what size 2 and 3 blade props you have used. On High Time with the Volvo D2/40 I have the 17 x 14 L 2 blade Flex-o-Fold and, if anything, it feels slightly over-propped. 2000rpm gives me 6.5knts in calm water and max revs (slightly less than 3000) gives around 8.5 knots.m It revs to around 3500 out of gear.

I usually cruise at just under 2000rpm and over many seasons have averaged around 2.4L/hr. 


Edited by High Time - 22 July 2021 at 14:57
Roger

High Time (415 #038)
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Matt1 View Drop Down
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Joined: 10 March 2019
Location: Hamble, UK
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Matt1 Quote  Post ReplyReply Direct Link To This Post Posted: 22 July 2021 at 16:18
Originally posted by High Time High Time wrote:

[QUOTE=Matt1]
Hi Matt
I'm curious what size 2 and 3 blade props you have used.
 
(Not sure if the below will display correctly, but will try - prop size is at the bottom of the table). This was a reasonably scientific experiment as "before" & "after" were both just after relaunch so with a pristine bottom and in essentially the same conditions
 
 
 93.54% Log calibration. Fully laden, 10kn TWS@30deg TWA, smooth sea93.54% log calibration  1/2 laden,                       10-12kn TWS @30deg TWA,  smooth sea
RPMSpdSpd
700n/a2.8
10002.63
11002.83.1
12003.23.2
13003.43.5
14003.84.4
15003.94.6
16004.34.9
17004.55.6
18004.75.8
19004.96.1
20005.16.4
21005.56.8
22005.77
230067.1
24006.37.3
25006.57.6
26006.6 
27006.97.9
28007.18.2
30007.52900 max revs
32007.8n/a
Prop18" X ? Pitch x2 blade17" X 14" X3 blade f-o-f
 
 
Hanse 418 #64 EmBer. Hamble, UK

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haifligher View Drop Down
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Joined: 22 March 2021
Location: Germany
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Post Options Post Options   Thanks (0) Thanks(0)   Quote haifligher Quote  Post ReplyReply Direct Link To This Post Posted: 22 July 2021 at 21:05
 Thx so much Matt, Tony, S&J, Roger, Peter… everyone! 
I‘m amazed how much information we‘ve got from all of you in such a short time Smile
I will try to collect more data and let you know…
Cheers!
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MasterKeil View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MasterKeil Quote  Post ReplyReply Direct Link To This Post Posted: 9 hours 37 minutes ago at 19:56
I had the flexofold 3 blade foldable prop as upgrade on my 2009 370 40 hp Yanmar. I was not happy with the stopping distance and RPMs at 6,5 kts, which were above 2000 RPM. So I called flexofold and they suggested a Prop with a higher pitch. As my prop was nearly brand new, they changed my prop for one with a higher pitch for free. Since then my cruising speed of 6,5 kt needs 1800 RPM and the stoping distance is a lot shorter. Yanmar requests the higher RPMs because Diesel with sulfur is also allowed for the engine; but in Europe the Diesel is nearly sulfur free, so the high RPMs are not needed to keep the engine clean.
Hanse 370#640 "Nemesis"
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