so37aruna
New Member
Posts: 4 
Jeanneau Model: Sun Odyssey 37 Legende
Yacht Name: Aruna
Home Port: Lake Macquarie
Country: Australia
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Post by so37aruna on Aug 6, 2015 11:11:08 GMT
G'day all, just looking to see if anyone has information on the standard prop nut for a 25mm shaft. My diver found that I had lost the nut and anode last week and I'm struggling to get anyone to tell me which nut I need. Initially the dealer told me it was a standard castellated metric nut with pin, but now I'm being told it is a torqued nut and that I will need to lift out of the water to put in place. Anyone had a similar issue?
FYI, I have a standard (factory fitted) fixed 3-blade bronze prop.
Cheers, Ian.
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Post by rene460 on Aug 6, 2015 12:36:26 GMT
Hi Ian,
My SO 30i has a 25 mm shaft. It has an ISO metric standard taper. If you Google ISO standard metric taper, you will find details of the taper (important if you are ordering a new propellor) and the correct thread size for the nut. I am not sure whether you will find the recommended torque, but I suspect that it would be there also.
I have replaced the propellor, and from memory, the nut supplied with the factory fixed propellor was not castellated, but machined with two flats for the spanner. The shape fitted into the anode which was fixed to the end of the shaft by a stainless steel socket head cap screw. The anode was hard to replace but it was eventually found catalogued as a "small Beneteau type", and duly purchased. It is very small and I would recommend an additional shaft mounted anode if you are in waters where anodes disappear quickly.
I cannot access the old nut at the moment, but if you get no other answer please PM me with your email address as I will be able to check my old nut in about a week. By the way, the manufacturer of the new prop was insistent on correct torquing of the nut and I will also be able to find that info for you. I suspect it would be a good starting point.
Props have a very expensive habit of falling off if not properly fitted, so be very cautious until you have a properly fitted nut. The slip way is probably the best option as the necessary torque is quite high door a diver to apply and in any case requires holding the inboard end of the shaft. A torque wrench is much easier to use if your feet are on dry ground.
rene460
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Post by blade on Aug 6, 2015 14:52:12 GMT
Hi Ian, my first post on here but have been following for quite some time. I have a 36i and replaced the fixed 3 bladed prop for a feathering type so had the original prop and nut in the garage. Have hopefully attached a photo of the nut, hope this is of some help. If you need some other angles, let me know and I will take some more pictures. Barry  |
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Post by sitara on Aug 7, 2015 0:44:25 GMT
Hi Ian,
The prop nut is held in place with a special washer. It has a lug off the centre hole that fits into the keyway to stop it from rotating. To prevent the nut from coming loose on side of the washer is bent up into one of the flats on the nut. Hope this is clear.
Rob
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Post by MickeyB on Aug 7, 2015 12:42:01 GMT
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so37aruna
New Member
Posts: 4
Jeanneau Model: Sun Odyssey 37 Legende
Yacht Name: Aruna
Home Port: Lake Macquarie
Country: Australia
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Post by so37aruna on Aug 10, 2015 10:47:26 GMT
Gents, thanks for all the responses, much appreciated. Hopefully, fingers crossed and all the other bits too, I should receive a nut, washer and anode set tomorrow in the post. But I'm not holding my breath! Unfortunately, on inspection of my skin fittings, specifically my salt water intake, it would appear that we have had some heavy electrolysis going on around us, as it is severely corroded and after only 7 months of being in the marina. I suspect the prop nut/anode fell foul of the same and hence the departing of said items. I find it very frustrating that it is so difficult to find out the specifications for something so basic as a nut, especially when you can google just about everything else. Anyway, as the old saying goes, "if you can't take a joke, you shouldn't have joined...." Regards, Ian BOAT - Bring out another Thousand.......s!  Attachment Deleted |
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Post by sitara on Aug 10, 2015 21:59:32 GMT
Hi Ian,
Jeanneau skin fittings are often made of brass and so have a short life span - see other threads about problems with skin fittings. I plan to replace mine with Tru-design plastic fittings when they reach the end of their life.
Rob
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Post by so36idavid on Aug 11, 2015 19:20:57 GMT
Hi Ian, my first post on here but have been following for quite some time. I have a 36i and replaced the fixed 3 bladed prop for a feathering type Barry, I have a 36i and I've been thinking of making the same change. Can you please pass on the specs of the new prop and your experience with it? Ian, have you considered adding a galvanic isolator? Relatively inexpensive and easy to install. There's lots of info on this board and others about the process. I added one and went from an anode/month to about every six months. Thx David |
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Post by vasko on Aug 11, 2015 20:07:28 GMT
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Post by blade on Aug 28, 2015 13:40:08 GMT
Hi Ian, my first post on here but have been following for quite some time. I have a 36i and replaced the fixed 3 bladed prop for a feathering type Barry, I have a 36i and I've been thinking of making the same change. Can you please pass on the specs of the new prop and your experience with it? Ian, have you considered adding a galvanic isolator? Relatively inexpensive and easy to install. There's lots of info on this board and others about the process. I added one and went from an anode/month to about every six months. Thx David Hi David Apologies for the delay in responding, we have been away for our summer cruise from 9th August, and only returned yesterday - try to limit time on computer to only essential things. I went for the Kiwi feathering prop, based partly on price, having only recently purchased the boat it was hard to convince the wife to spend further vast sums on the folding type. Under sail it has certainly improved things, always difficult to quantify by how much. I enter a number of local regattas and some longer distance ones and the gain in sailing performance outweighs the hit on rating. Under power I feel I get less speed for the same amount of revs, I did increase the angles on the blades by a further 1/2 degree after discussing with the suppliers but still feel it doesn't go quite so well under power, but primarily it was purchased for the improvement under sail. In reverse it seems OK, no delay or loss of power. When you see the size of the blades on the Kiwi compared to the fixed prop they do appear a lot smaller - if you go down the route of the Kiwi this may a point worth mentioning to the supplier. Barry |
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Post by blade on Aug 28, 2015 15:14:46 GMT
Hi David
Not wishing to go off post but just remembered I had taken a video of the propeller in action - not edited and excuse all the jellyfish. Link here
Barry
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Post by rodelesstraveler on Aug 28, 2015 16:36:29 GMT
I just changed my prop out on 2014 SO379 and can confirm it is a torqued nut.
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