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Old 05 October 2013, 14:52   #11
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My feet would still stick over the end ;-)
Yep, ditto!!
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Old 05 October 2013, 15:07   #12
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Not so sure as yet. This will follow in due course. There will be two prices one for the open version the other with cabin.
Cheers Andre. If you do find out how much they cost then I'd appreciate a pm; I think that's the best small jet-drive rib I've seen.
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Old 06 October 2013, 07:28   #13
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Nice looking boat Andre, what's the small control lever for low down on the console? & what is the "Volkswagen Marine" keypad for, is the engine a VW rebadged as Mercury?
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Old 06 October 2013, 14:11   #14
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Yep rebadged VW, VW pulled out the Marine market and Mercury are marketing them alongside what was previously the CMD range
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Old 07 October 2013, 04:16   #15
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Originally Posted by Pikey Dave View Post
Nice looking boat Andre, what's the small control lever for low down on the console? & what is the "Volkswagen Marine" keypad for, is the engine a VW rebadged as Mercury?
that lever has to be bucket control for the reverse. the VW engines are now branded Mercury Diesel TDI 3.0L 6 cyl 265HP and TDI 4.2L 8cyl 370HP, both now come with Smartcraft and DTS
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Old 07 October 2013, 04:28   #16
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Cheers Andre. If you do find out how much they cost then I'd appreciate a pm; I think that's the best small jet-drive rib I've seen.
I am expecting a price and will post it. Adam Younger did a good job on the hull. The deck and engine box is our design and for the initial tests we only had a laminated plywood deck, no engine box and a remote fuel tank. The first results were so encouraging that we quickly made a deck and engine box mould. The engine box had to consist of two sections due to total length. Also it had to be service engineer friendly. We have a 5 axel fully auto CMS m/c for making plugs and moulds so this was more or less an overnight job. The moulded deck also reduced the weight of the rib and that was the idea. Also a moulded deck and engine box will enhance any rib.
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Old 07 October 2013, 05:08   #17
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Many thanks for the comments Andre and a pleasure to work with Parker Boats.

Waterjet powered boats can be tricky to get right and often performance is not so great. The waterjet units in theirselves maybe reasonably (or better) efficient - but when you combine their effects on the hull the whole package can lead to disappointing figures.

But we used some new features on the 680 hull and very happy with the performance so far. The craft also has very good internal dimensions, handling and other characteristics to make a very serious work RIB. Also the build and looks of the finished craft are excellent and all credit to Parkers for this.
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Old 07 October 2013, 06:13   #18
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Waterjet powered boats can be tricky to get right and often performance is not so great. The waterjet units in theirselves maybe reasonably (or better) efficient - but when you combine their effects on the hull the whole package can lead to disappointing figures..
Yep, water jets are actually very efficient units as tip losses around the blades are reduced to a minimum. Being that the impeller rotates in a tunnel. An open prop lloses out to an impeller as quite a bit if energy is spent "throwing" water out radially instead of axially.

The problem with jets comes when you try to supply the impeller with a clean flow of water. You are in effect having ti 'lift' the water up into the impeller and then propel it out the rear. As AY says, hull design is critical.

During my days offshore i used to regularly helm jet drive FRC ribs. These were mainly norwegian built aluminium Ulstein SeaBear's . Awesome boats, 8 meters long, 320hp inboard diesel jet drive but were only capably of 30 ish knots. Mind you they did weigh nearly 3 tonnes. :-).
You could drive one of those through s brick wall and not notice!
Only thing i used to hate about them was ( like a lot of jet ribs) steerage at low speed/engine rpm was dreadful. There's something to be said about having an outboard leg sticking out under the hull.

Very nice rib that Parker jet.... Seems like a very serious company indeed Parker.....In fact dare i say it on here but i have been eyeing up those Parker pilothouse fast fishers for some time now.

Simon

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Old 08 October 2013, 09:33   #19
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that lever has to be bucket control for the reverse. the VW engines are now branded Mercury Diesel TDI 3.0L 6 cyl 265HP and TDI 4.2L 8cyl 370HP, both now come with Smartcraft and DTS
correction to Pikey Dave's question

Sorry but I got it wrong the bottom lever at knee height disengages the gearbox. The lever to control the bucket is the one on the right side of the RC box and the throttle is on the left side
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Old 08 October 2013, 09:55   #20
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correction to Pikey Dave's question

Sorry but I got it wrong the bottom lever at knee height disengages the gearbox. The lever to control the bucket is the one on the right side of the RC box and the throttle is on the left side
Ahh right No need to beat yerself up Andre So, bearing in mind I've never driven a jet drive, I assume this is how it works:-

The small lever in question engages the gearbox, which only ever runs in one direction (no sh1t boy band jokes please)

The throttle lever does what the throttle lever does.

The traditional "gear lever" actually controls the bucket which directs the flow of water for either forward or reverse.

So to put the boat into neutral, you would use the small lever & disengage the gearbox?

Is there much movement of the boat at tickover with the gearbox engaged? or is it a 3 lever manoeuvre to stop the boat?

Is there a neutral position on the bucket which produces neither a forward or reverse thrust?
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