Wayne,
The tubes run the full length of the keel to where the forefoot starts to curve upwards. If you go to the Fisher site via the link you will see boats at slow speed & stopped showing how they sit in the water. The tubes are approx 6" in diameter & about 18' feet long in my boat. At rest, some 450lb of seawater floods in in seconds & provides the lowdown ballast that deep V hulls need to stop them rolling. The water empties in a flash when throttle is applied as there are breather tubes attached to each tube. The breathers vent on the port side above the waterline.
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Regards,
Pete in Brisbane
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