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Broken prop shaft...!

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Garrydog View Drop Down
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    Posted: 19 September 2017 at 9:36am
Coming back from Bembridge on Sunday my wife and I had something of a fright!
Conditions were good, was cruising at about 14/15 knots when there was a large bang and all propulsion went...
I was just south of Spitbank Fort and near the Marie Rose buoy. Tide was drifting us towards the Portsmouth channel so put down the anchor.
Called Seastart who immediately despatched someone. Also spoke to the coastguard and from then on reported in at 15 min intervals. Was pleased that they could see me on AIS.
Eventually got back into Gosport luckily the prop had slid out and was caught on the rudder so remained watertight.
Both Seastart and the Coastguard were great as were Premier who lifted Seadog out first thing yesterday so I could survey the damage. Prop clearly hit something, the shaft was sheared off as it leaves the gearbox. The whole engine has been kicked sideways by the force.
Now waiting on quotes and obviously a confirmation from the insurance that all will be covered. Hopefully back out on the water in the not too distant future. Pretty nerve wracking especially sitting in the the dark ( it happened around 7.15 so still light but dark within 30 minutes) with no way of going anywhere). Very glad of all the kit onboard which was reassuring.
We were keeping a good watch, Nothing was evident, I can only assume something like a almost sunk log/piece of wood was the cause.
Keep safe everyone.
Johnny
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MadMackem View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MadMackem Quote  Post ReplyReply Direct Link To This Post Posted: 19 September 2017 at 5:33pm
Originally posted by Garrydog Garrydog wrote:


I was just south of Spitbank Fort and near the Marie Rose buoy. 

You were lucky it wasn't a WWII bomb. Lots of them around there.

Boat name MeMe; MMSI 235 086 284;    Call sign 2ELL9
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Garrydog View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Garrydog Quote  Post ReplyReply Direct Link To This Post Posted: 19 September 2017 at 5:38pm
Seriously!!? That would have been scary...
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Doombar Dave View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Doombar Dave Quote  Post ReplyReply Direct Link To This Post Posted: 19 September 2017 at 7:00pm
Sorry to hear of your bad luck glad that you got back in safely hope the repair is not to bad and you are back on the water soon.
Parker 660 AmyJames
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Salar View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Salar Quote  Post ReplyReply Direct Link To This Post Posted: 19 September 2017 at 7:43pm
Ouch! Scary. Glad you are safe though. Good that all the forces around us were watching, imagine that happening way out to sea?
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Garrydog View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Garrydog Quote  Post ReplyReply Direct Link To This Post Posted: 19 September 2017 at 8:35pm
Thanks for the messages. Hoping I will have insurance stuff sorted by the end of the week.
Fingers crossed...
J
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MONKEY NUTS View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MONKEY NUTS Quote  Post ReplyReply Direct Link To This Post Posted: 20 September 2017 at 10:18am
sorry to hear of this, not what you want at ant time but worse with the missus onboard! glad all was ok safty wise. 

if you need any help getting new one or fitting drop me a message. 

why it happened was prob due to the key way on your shaft not been machined correctly. seen it a lot of times. had to have X-rays done for insurance in the early days when it started happening. 
modern stainless shaft are made from duplex steel. its a lot harder than standard. so if the key is not spooned off to finish it, the sharp corners develop a crack and one day it just goes ping or you hit something. normally at the prop end or the gear box end as you had where the key starts/finishes.

if it had been spooned it would have just bent the shaft and stalled the engine.
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Garrydog View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Garrydog Quote  Post ReplyReply Direct Link To This Post Posted: 20 September 2017 at 11:24am
Thankyou, I will let you know. Hoping it will be an insurance matter but until confirmed somewhat nervous....
BR
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ahab Quote  Post ReplyReply Direct Link To This Post Posted: 20 September 2017 at 4:14pm
whats best john   keyway in the shaft at gear box   end or   on the prop also   how often do you think   you should replace
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MONKEY NUTS View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MONKEY NUTS Quote  Post ReplyReply Direct Link To This Post Posted: 20 September 2017 at 5:11pm
Originally posted by Ahab Ahab wrote:

whats best john   keyway in the shaft at gear box   end or   on the prop also   how often do you think   you should replace

no need to replace unless its rotten or lose in the keyway. never ever grease them either.

id check them every 3-5 years on the prop as they will rot quickly if the anodes are down low. on the inboard side they should be good for many years. most people have to do there cutless bearing every 2-5 years so that's the best time to check it on the prop. no one uses brass ones now so keys do last long time if correctly fitted.
( I know it sounds daft but a simple key in a key way, people F#?$ up all the time. grease, key bound, wrong size are all common F#?$ ups made)

if you find you have the newer duplex stainless shaft (easy to tell as its magnetic, normal stainless is not) and you have sharp cut ends in the keyway, then this is worth popping out and have a spoon machined in to it if you pumping high end power though it for its diameter. lower powered units don't get the same problem normally. its the stress which starts the crack off in the corners.

this is what a spooned keyway looks like

and this is a standard one
Image result for boat propeller shaft keyway
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