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Old 22 July 2013, 05:18   #11
kubcat's Avatar
Country: Australia
Town: Sydney
Boat name: Lunasea
Make: Ribtec 890SX
Length: 8m +
Engine: Yamaha ME 421STI x 2
Join Date: Aug 2009
Posts: 459
Originally Posted by JamesF View Post
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.
We have ballast tanks on the race boats. As mentioned they fill very quickly, ours fill a couple of hundred litres in well under a minute, but that's probably due to our high speeds and the ram effect. They take a few minutes to empty as it just relies on gravity. On the twin hull race boat we have a tank each side and can fill just one if required. Our tanks are baffled so we can run them half full.

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Old 22 July 2013, 11:21   #12
Country: Ireland
Town: Crosshaven
Boat name: erm..Miss Betty
Make: Souter/Avon/ILC!
Length: 7m +
Engine: 2*75hp Yamaha
Join Date: Jun 2004
Posts: 42
A75 has a 180kg tank and can only be filled on the run or by hose when ashore (i.e. for dodo launches into surf). Fills in c. 30secs at full chat - you can visibly see the nose sinking in front of you. Overspills when full - move lever to hold.

It dumps quite quickly at speed also due to venturi effect, IIRC, but slower at rest/slow speed, approx 2 mins I think.


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