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Old 07 April 2008, 08:48   #11
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Cookee's Avatar
Country: UK - England
Town: Salcombe, Devon, UK
Boat name: BananaShark
Make: BananaShark
Length: 10m +
Engine: 2xYanmar 260 diesels
Join Date: Mar 2003
Posts: 4,225
Originally Posted by Polwart View Post
perhaps pm cookie - i think he has/had one of their new 6m(ish) boats with a jet in it.

I guess most people don't have major concerns re shallow water or prop safety so the compromise in cost/performance is not necessarily worthwhile.
Hi - We have a boat in stock with the same unit as the Parker (Mercruiser 120 diesel waterjet) in a 6 metre hull - we have had 36 mph out of ours and I reckon we average about 12 Litres per hour although the official figures at full speed reckon about 25 litres and hour to be correct. At the moment the boat has a wakeboarding frame on it, a bench seat and two front seats with a temporary console. Email me for more details and photos if you want to know more!

The boat is so much fun to drive, especially doing crash stop 180's at full throttle! We can fit any seating and console arrangement to suit the projected use of the boat by the way!
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Originally Posted by Zippy
When a boat looks that good who needs tubes!!!
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Old 08 April 2008, 03:12   #12
Country: France
Town: Cannes
Boat name: midkat 550
Make: apoge
Length: 5m +
Engine: 2x50 Tohatsu
Join Date: Jan 2008
Posts: 126
waterjet rib

several years ago I made a prototype to match a particular request.

The boat was a Tomcat 5metre catamaran.
I installed a Mercury 60HP outboard, fitted with a jet leg instead of the standard prop leg.
Due to the fact that the speed was lifting the hull, I had to make some special GRP extension, but it worked well.

The speed was approximately 23 kn, normal when you know 30% of HP is lost.

The result would have been much better with a twin engine indeed, because in this case the waterflow entering the turbine would not be affected by the hull heigth, turns, etc... wich make it behave like cavitation.

This is a cheap and very efficient solution : buy a pair of standard outboard engines, and a pair of waterjet extension.
The extensions are very cheap - approx 1500 to 2000$ - easy to install, and they exist for most engines up to 200HP and up. Much less than waterjets packages, and you have both possibilities for the same price, waterjet or prop either.

I will fit my next rib (Tomcat 570 with 2x50HP, or 610 with 2x70) with that.

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Old 10 April 2008, 11:17   #13
Country: UK - England
Town: Holbury
Make: Ocean Dynamic
Engine: 2 330 Iveco Hamilton
Join Date: Feb 2003
Posts: 62
Jet Rib

Avon make a Jet Rib about 5.4 meters. Modern Jets are very efficient .
Achilles heels in shallow water they suck up shingle and other muck from
the bottom. We once built one in a Avon 4.5 m with a rotax engine and
UA jet> A outboard with hydraulic trim will go in shallower water than a
jet. Barrus make a outboard water jet .We now have a 9.5 meter Ocean
Dynamic with 400hP Iveco Diesel and Hamilton Water Jet Rescue Rib
Hope this helps. "Tiffy Venturers " SAR

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