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Old 21 July 2013, 04:01   #1
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rnli atlantic ribs

I noticed the local lifeboat has a water ballast tank. Anyone know how big it is on them?
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Old 21 July 2013, 04:44   #2
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200 kgs in weight on the A85 .
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Old 21 July 2013, 04:52   #3
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We went to see the the one at Cowes but they didn't mention anything about a ballast tank, anyway here's some pics if you like the 85's...

Cowes RNLI Open Day

Loved the knifes located on the cone ends and also the water supply to the legs so that they can start the engines before it hits the water
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Old 21 July 2013, 07:10   #4
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Originally Posted by whisper View Post
We went to see the the one at Cowes but they didn't mention anything about a ballast tank, anyway here's some pics if you like the 85's...

Cowes RNLI Open Day

Loved the knifes located on the cone ends and also the water supply to the legs so that they can start the engines before it hits the water
In your first group of photos, you can see the control cable (red outer) between the two outboards - it leads from the helm seat to the tank control valve on the transom:



And in your second set of photos you can just make out the control lever at the helm seat (stainless lever with black knob on the end, just inboard of the throttles)



Cheers

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Old 21 July 2013, 07:27   #5
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A few more pics added but none of the ballast equipment...
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Old 21 July 2013, 07:32   #6
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A few more pics added but none of the ballast equipment...
The stainless steel component in the centre of your photo:



Is the ballast tank valve.

Cheers

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Old 21 July 2013, 07:36   #7
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So can they fill and empty the tank on the water?
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Old 21 July 2013, 08:08   #8
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So can they fill and empty the tank on the water?
Yes they can - in fact I think (not 100% sure) they can only fill on the water. The lever at the helm seat has three positions - hold, fill and drain - the helmsman adjusts as required depending on conditions.

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Old 21 July 2013, 08:10   #9
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The Sidmouth Arctic 24 has a ballast tank as well. About a quarter of a ton, and takes just a few minutes to refill at sea, if I remember rightly. I forget how quickly they can dump it.
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Old 21 July 2013, 14:24   #10
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the ballast lever essentially opens a flap, which when under way forces water in to the bow. When its full up, water runs out of a tell tale inboard at the bow, and runs down the deck. at this point, the water can be 'held' or 'drained'. I am sure on the A75 its only around 60kg, but dont quote me on that. The boat needs forward momentum to fill the ballast tank, and cant be done on the spot
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