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Post by Deleted on Aug 5, 2019 10:24:44 GMT
I would like to arrange a wheel steering system for my inspection launch. Its basically a 40x9ft 15tonne steel canal boat with a conventional narrow boat type rudder with ornate wooden steering bar/tiller.
I found a very nice helm wheel in the river so all I need is a couple of sprockets and taperlocks and some simplex chain. Plus a couple of pillow blocks and I have a stainless rod for the steering column.
I'll cross the chain so the steering is in the correct direction.
What sort of reduction between helm and rudder stock would be sensible?
3:1 maybe?
I'm not sure how to work it out.
Edited as posted too early and odd typos
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Post by Deleted on Aug 5, 2019 13:46:06 GMT
Having thought about it I have realised I can simply use an old Seagull outboard bevel gearbox for the 3:1 reduction and direction change then simply chain drive to the rudder stock with some sprockets so I have gone for 14T and 21T meaning I should be achieving an overall reduction from steering wheel to rudder stock of 4.5:1 which I think should work.
The old seagull century gearbox is a heavy duty bronze bevel gear arrangement so I think using it as a steering box should be OK. This is not for hammering it along and loading up the rudder it is strictly for summer dawdling on the Thames.
For other purposes I can just take it off and bolt the tapered tiller fitting back on in a couple of minutes.
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Post by JohnV on Aug 5, 2019 18:08:08 GMT
I don't know is the answer from me  I will be at the drydock tomorrow and there are 4 barges there that have chain steering ..... I will go on the easiest to get to and check it out. I think that Gamma's rudder is clear of the blocks so I should be able to check lock to lock turns Oddly this afternoon I was being told of a fatal accident on a loaded barge with chain steering, caused by the chain steering and a degree of carelessness. It was a mate on a loaded barge that lost his angle in a tight bend with a big tide behind him. The stern hit the stone bank, he stumbled, the rudder then was swept round causing the wheel to spin. One of the spokes caught him and threw him across the wheelbox caving in his skull. Not of course that I am telling you this horror story with any intention of scaring you off having chain steering  |
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Post by Deleted on Aug 5, 2019 18:13:05 GMT
I don't know is the answer from me I will be at the drydock tomorrow and there are 4 barges there that have chain steering ..... I will go on the easiest to get to and check it out. I think that Gamma's rudder is clear of the blocks so I should be able to check lock to lock turns Oddly this afternoon I was being told of a fatal accident on a loaded barge with chain steering, caused by the chain steering and a degree of carelessness. It was a mate on a loaded barge that lost his angle in a tight bend with a big tide behind him. The stern hit the stone bank, he stumbled, the rudder then was swept round causing the wheel to spin. One of the spokes caught him and threw him across the wheelbox caving in his skull. Not of course that I am telling you this horror story with any intention of scaring you off having chain steering I quite like horror stories like that as it is always worth knowing what to be aware of. Like those narrow boat seats which are inside the tiller arc. Dangerous because the rudder can cause the tiller to swing violently specially when reversing and when reversing you do NOT want to be falling off the back of a boat !! |
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Post by JohnV on Aug 6, 2019 16:05:54 GMT
magnetman hope this is of help
The "Gamma" has 10 turns lock to lock
I have been reliably informed that this is about the norm. The wheel on "Gamma" is huge, she is about double the length of yours and 17 foot beam she probably needs it ..... but she is actually quite light to handle
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