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Old 14 October 2010, 15:09   #1
Country: UK - Scotland
Town: Fort Augustus
Boat name: Ness Express
Make: Humber / Quinquari
Length: 10m +
Engine: Volvo D6
Join Date: Jul 2008
Posts: 17
Outdrive versus Jet, Which would you chose ?

Hi all, we are thinking about upgrading our fleet and wondering about the operating values of jet drives over our trusty bravo 2 legs.

Discuss !


Ackee is offline   Reply With Quote
Old 14 October 2010, 15:27   #2
Country: UK - England
Town: NW& wherever the boat is!
Boat name: depends on m'mood!
Make: Humbers/15-24m cats
Length: 6m +
Engine: etec130/big volvos
MMSI: many and various
Join Date: Nov 2001
Posts: 1,815
just love twin jets.........

Dave M
wavelength is offline   Reply With Quote
Old 14 October 2010, 17:36   #3
Country: UK - Channel Islands
Town: Jersey
Boat name: Archangel
Make: Ribcraft
Length: 6m +
Engine: ETec 225
MMSI: 235063789
Join Date: Sep 2008
Posts: 1,005
Advantages of jet drives are that they offer increased manouverablity (see this video: ), they can operate in significantly shallower water and there's nothing to hit below the waterline like a prop or a leg.

The downside is they are less efficient than a conventional sterndrive (by about 30%) and so require a larger engine to maintain the same horsepower. They are noisier and vibrate more as everything's inside the boat (they also take up more room as a consequence) and they are more expensive to buy and fit. Also, if you're not careful you'll suck up stones or weed and this will damage the impellor and may stop the boat in its tracks.

Mind you, how many stern-driven ribs would dare try this? - (f/forward to 1:35).
GJ0KYZ is offline   Reply With Quote
Old 15 October 2010, 06:31   #4
Country: UK - England
Town: Various
Length: 6m +
Join Date: Jun 2009
Posts: 30
Personally I have only driven military jet drive ribs which I found to be brilliant on flattish water but as soon as the swell picks up lacks drive when you leave the water due to the propulsion system needing to intake water to constantly drive the boat forward. I found them not to be that great either when operating in aerated/turbulent water ie surf or coming alongside a ship underway not ideal to be losing drive whilst trying to embark a boarding party but hardly a problem youd find with a commercial operator.
colblinky is offline   Reply With Quote

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