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Old 02 September 2005, 09:50   #31
Country: UK - England
Town: Margate / Ramsgate
Boat name: Ballistic
Make: Ballistic
Length: 7m +
Engine: Yam HPDI 250
Join Date: Feb 2002
Posts: 2,775
The very design and idea of an elephants trunk is such that is collapses when water is not flowing through it - which makes it, kind of, water tight.

Certianly this is always enough to stop water getting back in for short periods when stopped, or even mored up during lunch or similar.

They only need to be "closed" or tied up when leaving the boat for an extended time, like overnight.

Daniel is offline   Reply With Quote
Old 02 September 2005, 12:54   #32
Country: Other
Length: no boat
Join Date: Aug 2005
Posts: 623
Electric bilge pumps are not salvage pumps, they are not designed for continuous use and will burn out. If you go to sea or anywhere the weather is likely to be changeable (for the worst) and cut up rough miles from a safe haven, install bilge pump (for bilge) 2 X 3" trunks, and manual Whale Gusher type pump. This last is not essential, as one scared man with a 3 gallon bucket can shift more than all these methods put together. As for operating the trunks, take a trip line through jam cleats to suitable position. Drop the trunks, motor home safely and clear all the water you will get on-board in serious weather. If you're not keen, splash out and buy another 4 disco bilge pumps.

If you never flood it, then you're just not driving it hard enough!

hard1 is offline   Reply With Quote
Old 06 March 2006, 15:45   #33
Country: USA
Town: Annapolis MD
Length: 6m +
Join Date: Aug 2005
Posts: 10
Open Transom Jet Rib

Originally Posted by hard1
...... Best RIB design is jet drive, sloping floor and open transom. Never any water in the boat ever.
I have been thinking along these lines for some time now as I searched for a
short, wide, open-transom tender/dive craft that could be carried (two of
them) on the front deck of a 65' gamefishing catamaran of my design,

I was seeking a relatively small tender craft that comfortable could carry 4/5 persons with some dive and/or dive/fishing gear. Too many of the existing RIBs are too confining in their interior space, particularly those made to conform to road towing widths. I wanted two persons to be able to sit on the tubes across from one another, and yet still have the leg-room to clear a central straddle seat that might house the jet ski type power plant. That would call for a fairly wide craft with a central hull that could house the water jet. A very wide craft needing a central water hull rules out the cat configuration. I could have a transom for its structural contribution, but it could be open to allow for immediate evacuation of any water that might swamp it as a result of a large wave washing over the bow stowage area of the mothership. With width I could accommodate the people without excessive length and thus keep the boat size small for the continuous hoisting service it will see.
brian eiland is offline   Reply With Quote
Old 06 March 2006, 16:31   #34
Country: UK - Wales
Town: swansea
Boat name: Too Blue
Length: 8m +
Engine: Suzuki DT225
Join Date: Mar 2004
Posts: 12,791
Have a look at zapcats - probably too small and not a jet but may give you ideas.

codprawn is offline   Reply With Quote

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