myHanse.com - Hanse Yacht Owners Website myHanse.com - Hanse Yacht Owners Website myHanse.com - Hanse Yacht Owners Website myHanse.com - Hanse Yacht Owners Website

Welcome to myHanse.com the forum for Hanse Yachts owners throughout the world.

Forum Home Forum Home > Hints & Tips > 320
  New Posts New Posts RSS Feed - New folding propeller and gear reduction ratio
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

New folding propeller and gear reduction ratio

 Post Reply Post Reply
Author
Message
aquilo View Drop Down
Lieutenant Commander
Lieutenant Commander


Joined: 09 September 2008
Status: Offline
Points: 70
Post Options Post Options   Thanks (0) Thanks(0)   Quote aquilo Quote  Post ReplyReply Direct Link To This Post Topic: New folding propeller and gear reduction ratio
    Posted: 06 March 2017 at 09:29
Hi

During winter we finally replaced the original jib with a better quality one (+positive leech) and we also want to replace the fixed propeller with a flexofold 2 blade (classic or composite).

Our boat is a 2010 build ("Smartline") with standard motor 3YM20 and saildrive from Yanmar.

I cannot find any labels on the saildrive. Anyone knows the gear reduction ratio (and possible other data) needed to choose the right size/type propeller?



Hanse 320
Norway
Back to Top
Frederick View Drop Down
Lieutenant
Lieutenant


Joined: 09 May 2016
Location: Kiel Germany
Status: Offline
Points: 31
Post Options Post Options   Thanks (0) Thanks(0)   Quote Frederick Quote  Post ReplyReply Direct Link To This Post Posted: 06 March 2017 at 10:40
Most  probably you will have the SD20 from Yanmar. The technical data you can find here.
Hanse 342#464 Frederick
Back to Top
aquilo View Drop Down
Lieutenant Commander
Lieutenant Commander


Joined: 09 September 2008
Status: Offline
Points: 70
Post Options Post Options   Thanks (0) Thanks(0)   Quote aquilo Quote  Post ReplyReply Direct Link To This Post Posted: 06 March 2017 at 11:33
You're right, it's a SD20 and the reduction ratio seems to be 1:2.64 according to the document.


Hanse 320
Norway
Back to Top
Andre View Drop Down
Sub Lieutenant
Sub Lieutenant


Joined: 26 March 2017
Location: The Netherlands
Status: Offline
Points: 7
Post Options Post Options   Thanks (0) Thanks(0)   Quote Andre Quote  Post ReplyReply Direct Link To This Post Posted: 26 March 2017 at 22:20
I have recently installed a new Flexofold 16 x 12 LA 2 blade folding prop. on our 320 as replacement for the standard fixed one, so the new design with large hub and protected gears with large anode.
Dimensions were advised by Flexofold.
Boat is still ashore, so no results yet.
Back to Top
Janni View Drop Down
Captain
Captain
Avatar

Joined: 19 June 2010
Status: Offline
Points: 176
Post Options Post Options   Thanks (0) Thanks(0)   Quote Janni Quote  Post ReplyReply Direct Link To This Post Posted: 03 April 2017 at 06:14
We have installed a 3 Blade Flexofold on our Smartline. We are very happy with it. 
Dimensions were defined by Flexofold. There is only one little issue - we have YM30 instead of the YM20 - which we did not know before buying the prop. Now the engine revolutions are a bit on the high side. 
Jan
Hanse 320 #548 "SCHNEGGE"
Back to Top
Andre View Drop Down
Sub Lieutenant
Sub Lieutenant


Joined: 26 March 2017
Location: The Netherlands
Status: Offline
Points: 7
Post Options Post Options   Thanks (0) Thanks(0)   Quote Andre Quote  Post ReplyReply Direct Link To This Post Posted: 06 June 2017 at 20:03
Some feedback from my experiences with the  Flexofold 16 x 12 LA 2 blade.
On motor: a bit less thrust ahead and max. motor speed going up to 3700 rpm which is actually 100 rpm more than the engine should run at full speed. Also at 2800 rpm (which used to be my favourite engine speed) a bit less boat speed of 6.2 knots where the fixed one provided about 6.5 knots. Clearly less thrust in astearn, something to get used to, but certainly sufficient. The prop is opening/closing very smooth (you don't hear it, wouldn't know it is a folding one if I wouldn't have seen it myself  prior launnching the boat), no noise at all and is also when running very silent. More silent than the old fixed one and finally no annoying "prop singing" anymore. Compared to the fixed prop in general I have the impression the folding one could have been slightly bigger in diameter and/or pitch (because at full throttle engine seems slightly overreving and a bit less speed at 2800 rpm), but it is also possible the fixed one in fact was slightly too heavy as engine tended to smoke a bit at full throttle. Max. boatspeed at full throttle is 7.2 knots in good weather, not bad at all.
Sailing, for which it was in fact bought: Upwind the boat speed increased with at least 0.3 - 0.4 knots, which I am very pleased with, I now am convinced about the folding prop advantages, always believed this was commercially exagerated. Also no annoying vibrations anymore (I always blocked the fixed prop from running when sailing) on the rudder and in the boat, just silent sailing.
So based on my first experiences and observations: very pleased.
Back to Top
 Post Reply Post Reply

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 12.06
Copyright ©2001-2023 Web Wiz Ltd.

This page was generated in 0.094 seconds.

Links : www.hanseyachts.co.uk www.hanseyachts.com www.fjordboats.co.uk www.dehler.co.uk www.varianta.co.uk