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Old 04 March 2006, 19:43   #1
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Trunks

Why just sikaflexing a tube into the transom is not a good idea.

A radius will encourage laminar flow when a fluid is forced to change direction. The larger the radius the less induced turbulence and the better the flow.

I trust the diagrams are self explanatory.

I've even seen narrow slots at the base of a transom. Imagine the plugging effect of the turbulance through a slot.
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Old 04 March 2006, 21:17   #2
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Hi JW,
What is the best leading edge radius that you suggest then?. I think the bail time saving would prob only be a second or so from looking at your your sketch, all though a radius would look smarter.
Im interested coz Im getting a custom one made in the machine shop at work. Also what bore size do you think I should go for?? Only got room to fit one trunk, was thinking about 75mm-3".
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Old 05 March 2006, 06:33   #3
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Originally Posted by yoyo
What is the best leading edge radius that you suggest then?.
As big as you can manage. It's likely to be variable depending on the bailer's placement in the transom.
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I think the bail time saving would prob only be a second or so from looking at your your sketch,
It depends on how much water is in the boat. A well shaped hole could easily half (or more) the bailing time. That make one bailer = two. Or two = four.
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Also what bore size do you think I should go for?? Only got room to fit one trunk, was thinking about 75mm-3".
Again, as big as possible.
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Old 05 March 2006, 06:53   #4
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This sort of size?
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