• REMINDER - COVID-19

    Any content, information, or advice found on social media platforms and the wider Internet, including forums such as YBW, should NOT be acted upon unless checked against a reliable, authoritative source, and re-checked, particularly where personal health and liberty is at stake. Seek professional advice/confirmation before acting on such at all times.

    Users who are found to promulgate FAKE NEWS on the forum in regard to this issue, intentional or otherwise, may find their access terminated. It is your responsibility to provide references to bona fide sources.

    FAKE NEWS, in this regard, is that which is posited by organisations, media, etc., that is repeated on the forum, or used to support personal opinion/hypothesis posted by users - FAKE NEWS is not necessarily the personal opinion/hypothesis being posted in itself, any issues with such should be challenged respectfully.

Shaft problems (boats)

powerskipper

Active member
Joined
18 Sep 2003
Messages
12,259
Location
Dorset/ Hampshire. south coast
I was on a boat recently when we had a shaft break, ( second time it has happened to me , o h and have had a couple of props that did not want to stay on.)
Luckily she was a twin screw, but every-time we tried turning to port you could hear it make what I would call an unhappy sound. well it was midnight and it had been a long day. So chugged back to berth trying not to turn to port more than a quarter turn . Made it a interesting navigation exercise to get back to Hamble and up river. Crew on the boat where told no point for finesse please as we get close to the pontoon get a rope on , don't mind what just get them on. We made it back OK , Turned out she had been new engines and one was slightly out of alignment.
So who has had similar happen to them.?
 

38mess

Well-known member
Joined
9 Apr 2019
Messages
1,882
Location
Wales
Well done for getting back, but would a slightly out of line engine break a shaft? More like a fault in the shaft itself maybe.
 

Rappey

Well-known member
Joined
13 Dec 2019
Messages
1,548
If the shaft is constantly getting bent then it will eventually snap due to fatigue?
If it were badly out of alignment I would have thought it would destroy the inboard and outboard bearings?
 

RichardS

Well-known member
Joined
5 Nov 2009
Messages
25,676
Location
Home UK Midlands / Boat Croatia
I've got twin engines but no shafts, as such, so thankfully never any alignment problems.

I thought most boats has shafts which were 25mm or similar. Is it possible for those to break?

Richard
 

powerskipper

Active member
Joined
18 Sep 2003
Messages
12,259
Location
Dorset/ Hampshire. south coast
She has thrown a shaft out, it had come out , the month before, this was a new shaft. it lasted 3 days. smallest shafts I have seen on a boat,. she was an old girl but great apart from the shaft problem. It what they were think it could be from the last update. will try and find out more if I can.
I had another break but that was a fault in the shaft, they found when they lifted her that it was only solid for a 1/3 of its diameter.
 

penberth3

Well-known member
Joined
9 Jun 2017
Messages
1,433
She has thrown a shaft out, it had come out , the month before, this was a new shaft. it lasted 3 days. smallest shafts I have seen on a boat,. she was an old girl but great apart from the shaft problem. It what they were think it could be from the last update. will try and find out more if I can.
I had another break but that was a fault in the shaft, they found when they lifted her that it was only solid for a 1/3 of its diameter.
Sorry, I don't understand what you mean there. Thrown out/come out of what/where?
 

AndrewB

Well-known member
Joined
7 Jun 2001
Messages
5,536
Location
Corfu
The only time I've had a shaft break, it was caused by electrolysis. That was before I understood about fitting an anode.
 

prv

Well-known member
Joined
29 Nov 2009
Messages
36,486
Location
Southampton
I’ve had the output flange of the gearbox come off, resulting in the shaft sliding backwards out of the boat. Fortunately not all the way so as to leave a hole, but it meant no power and, with the prop wedged against the rudder, not a lot of steering either.

Pete
 

powerskipper

Active member
Joined
18 Sep 2003
Messages
12,259
Location
Dorset/ Hampshire. south coast
She has thrown a shaft out, it had come out , the month before, this was a new shaft. it lasted 3 days. smallest shafts I have seen on a boat,. she was an old girl but great apart from the shaft problem.
I had another break but that was a fault in the shaft, they found when they lifted her that it was only solid for a 1/3 of its diameter.
Sorry, I don't understand what you mean there. Thrown out/come out of what/where?
apparently it slipped out of the gearbox and jammed against the rudder.
 
Top