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20 January 2008, 14:10
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#1
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Member
Country: Sweden
Town: Stockholm
Boat name: Sea Dachshound
Make: ..shopping for a RIB
Length: 5m +
Engine: Merc 90 4-stroke
MMSI: 265585460
Join Date: Jul 2003
Posts: 88
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Jetpack?
Anyone has any insight into this technology, or care to comment on this anyway?:
Looks interesting in theory:
http://www.zodiacmilpro.com/library/index.html
(Sea Rib Open 700 - New 7 M, 200 HP diesel waterjet)
http://www.swordmarine.com/WhyJetPac.asp
best
jtm
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20 January 2008, 15:17
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#2
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RIBnet admin team
Country: UK - England
Town: The wilds of Wiltshire
Boat name: Dominator
Make: SR5.4
Length: 7m +
Engine: Yam 85
MMSI: 235055163
Join Date: Jul 2005
Posts: 13,069
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Looks suspiciously like the Isuzu 2.8 diesel in there.
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20 January 2008, 16:54
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#3
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Member
Country: UK - Wales
Town: swansea
Boat name: Too Blue
Make: BLANK
Length: 8m +
Engine: Suzuki DT225
Join Date: Mar 2004
Posts: 12,791
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This was discussed a long time ago. The general feeling was that it looks vulnerable to damage with constant wave jumping. it also looks like it could be swamped quite easily!!!
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20 January 2008, 17:22
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#4
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RIBnet admin team
Country: UK - Scotland
Boat name: imposter
Make: FunYak
Length: 3m +
Engine: Tohatsu 30HP
MMSI: 235089819
Join Date: Sep 2005
Posts: 11,632
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Quote:
Originally Posted by codprawn
The general feeling was ...
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I am not sure that it is possible to draw a "general feeling" from what was a pretty brief discussion. They have been mentioned here a few time and there were as many "thats an interesting idea" statements as there were "that will never work".
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20 January 2008, 18:46
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#5
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RIBnet admin team
Country: UK - England
Town: The wilds of Wiltshire
Boat name: Dominator
Make: SR5.4
Length: 7m +
Engine: Yam 85
MMSI: 235055163
Join Date: Jul 2005
Posts: 13,069
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Actually, I'd be more interested in how strong the 2.8 Isuzu engine is when it's putting out 200hp. It's only 109hp in a car.
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20 January 2008, 18:58
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#6
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Member
Country: Sweden
Town: Stockholm
Boat name: Sea Dachshound
Make: ..shopping for a RIB
Length: 5m +
Engine: Merc 90 4-stroke
MMSI: 265585460
Join Date: Jul 2003
Posts: 88
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sorry,
Searched for "jetpac" but found nothing....some other searches (jet pac) yielded that it has already been discussed.
Interesting unit though....
I wonder what speeds you could get comparatively...and if it's any closer to a sterndrive or an outboard in performance compared to other jetdrives of the past.
Is it better at all performance-wise I wonder?
The beauty in theory is obviously in shallow water (priority for me) combined with room on a 6-8 m RIB.
best
jtm
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20 January 2008, 23:32
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#7
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Member
Country: Canada
Town: British Columbia
Make: Gemini
Length: 4m +
Engine: 40hp 2 str
Join Date: Oct 2003
Posts: 2,151
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Quote:
Originally Posted by Nos4r2
Actually, I'd be more interested in how strong the 2.8 Isuzu engine is when it's putting out 200hp. It's only 109hp in a car.
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The 109 hp capacity in the automotive application probably has more to do with cooling mechanism limitations, than to do with the strength of the engine's internal components such as connecting rods. In a marine application you have:
a) an unlimited supply of cold engine coolant, and more importantly;
b) an unlimited supply of cold liquid coolant for the of intercooler, which would allow you to boost the hell out of it with out having the EGTs go through the roof.
I think the concept is quite interesting, but could see where it may make short work of a transom if it's used for wave jumping.
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20 January 2008, 23:39
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#8
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RIBnet admin team
Country: UK - England
Town: The wilds of Wiltshire
Boat name: Dominator
Make: SR5.4
Length: 7m +
Engine: Yam 85
MMSI: 235055163
Join Date: Jul 2005
Posts: 13,069
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Quote:
Originally Posted by prairie tuber
The 109 hp capacity in the automotive application probably has more to do with cooling mechanism limitations, than to do with the strength of the engine's internal components such as connecting rods. In a marine application you have:
a) an unlimited supply of cold engine coolant, and more importantly;
b) an unlimited supply of cold liquid coolant for the of intercooler, which would allow you to boost the hell out of it with out having the EGTs go through the roof.
I think the concept is quite interesting, but could see where it may make short work of a transom if it's used for wave jumping.
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You have a point. The 109hp version in my car doesn't even have an intercooler.
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20 January 2008, 23:41
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#9
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Member
Country: Canada
Town: British Columbia
Make: Gemini
Length: 4m +
Engine: 40hp 2 str
Join Date: Oct 2003
Posts: 2,151
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To be honest, I have no idea if the jetpac uses one either, but they'd be silly not to.
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20 January 2008, 23:56
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#10
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RIBnet admin team
Country: UK - England
Town: The wilds of Wiltshire
Boat name: Dominator
Make: SR5.4
Length: 7m +
Engine: Yam 85
MMSI: 235055163
Join Date: Jul 2005
Posts: 13,069
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If it's got one it's between the turbo and the intake manifold. The turbo has an air filter bolted to it.
<edit> I should RTFM... Cambelt isn't exposed.
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21 January 2008, 00:33
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#11
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Member
Country: Canada
Town: British Columbia
Make: Gemini
Length: 4m +
Engine: 40hp 2 str
Join Date: Oct 2003
Posts: 2,151
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I just checked the site & yes, the 200 hp diesel is intercooled. The enine cooling system is close loop with a watercooled radiator.
A quick google search for 'sword marine jetpac' produced this article;
http://www.bymnews.com/news/newsDetails.php?id=20275
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21 January 2008, 00:53
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#12
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Member
Country: UK - Wales
Town: swansea
Boat name: Too Blue
Make: BLANK
Length: 8m +
Engine: Suzuki DT225
Join Date: Mar 2004
Posts: 12,791
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I see they also do a 300hp petrol version. Think I would prefer an outboard.........
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21 January 2008, 10:07
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#14
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RIBnet admin team
Country: UK - Scotland
Boat name: imposter
Make: FunYak
Length: 3m +
Engine: Tohatsu 30HP
MMSI: 235089819
Join Date: Sep 2005
Posts: 11,632
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Quote:
Originally Posted by codprawn
I see they also do a 300hp petrol version. Think I would prefer an outboard.........
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but you are not in the market for a jet drive - the USP is not that its a big engine - its that you can have features/benefits normally only available on an inboard without loosing the space or cutting holes in the hull etc.
it does address many of the disadvantages of an inboard instalation.
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21 January 2008, 12:19
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#15
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Member
Country: UK - Wales
Town: swansea
Boat name: Too Blue
Make: BLANK
Length: 8m +
Engine: Suzuki DT225
Join Date: Mar 2004
Posts: 12,791
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Don't you mean losing???
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21 January 2008, 12:37
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#16
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Member
Country: Sweden
Town: Stockholm
Boat name: Sea Dachshound
Make: ..shopping for a RIB
Length: 5m +
Engine: Merc 90 4-stroke
MMSI: 265585460
Join Date: Jul 2003
Posts: 88
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Interesting, thanx for that.
Don't suppose you've driven one in winter/ice conditions and can comment
whether it could be configured for use in winter w ice .e. reinforced impellers or the like? Just curious...
best
jtm
Quote:
Originally Posted by seahorse
I drove those units a few years ago when they were under development by the inventor Bill Lawson, before he sold to Sword.
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21 January 2008, 14:02
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#17
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Member
Country: USA
Length: under 3m
Join Date: Aug 2007
Posts: 22
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Quote:
Originally Posted by houser
Interesting, thanx for that.
Don't suppose you've driven one in winter/ice conditions and can comment
whether it could be configured for use in winter w ice .e. reinforced impellers or the like? Just curious...
best
jtm
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I tested the engines in Florida where the only ice is was in our drinks! Better contact the factory for that kind of info.
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21 January 2008, 17:58
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#18
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RIBnet admin team
Country: UK - Scotland
Boat name: imposter
Make: FunYak
Length: 3m +
Engine: Tohatsu 30HP
MMSI: 235089819
Join Date: Sep 2005
Posts: 11,632
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Quote:
Originally Posted by seahorse
I tested the engines in Florida where the only ice is was in our drinks! Better contact the factory for that kind of info.
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Since you are one of the few people to have actually seen one of these in the flesh do you think there is any justification in the concerns people expressed about the forces acting on the transom? i.e. is it suited to wave jumping?
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21 January 2008, 18:11
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#19
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Member
Country: UK - Scotland
Make: HumberOceanOffshore
Length: 8m +
Engine: Volvo KAD300/DPX
Join Date: Oct 2002
Posts: 5,596
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Unless you're clean out of the water, I'm not sure the loads will be so high since the unit has it's own buoyancy.
Although lots of pics on here and in magazines have folk showing off with their boats out of the water, if you drive properly you may find you rarely get into that situation.
I don't understand the oo-ing and ahh-ing that folk do when they see a boat out of the water, and therefore out of control, with it's bow 3mtrs into the air. Kinda like doing handbrake turns in yer car.
Perhaps I'm too old to know.
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JW.
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21 January 2008, 20:13
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#20
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RIBnet admin team
Country: UK - Scotland
Boat name: imposter
Make: FunYak
Length: 3m +
Engine: Tohatsu 30HP
MMSI: 235089819
Join Date: Sep 2005
Posts: 11,632
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Quote:
Originally Posted by jwalker
Unless you're clean out of the water, I'm not sure the loads will be so high since the unit has it's own buoyancy.
Although lots of pics on here and in magazines have folk showing off with their boats out of the water, if you drive properly you may find you rarely get into that situation.
I don't understand the oo-ing and ahh-ing that folk do when they see a boat out of the water, and therefore out of control, with it's bow 3mtrs into the air. Kinda like doing handbrake turns in yer car.
Perhaps I'm too old to know.
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JW - has no one told you the higher you can get your boat out the water the bigger everyone will believe your manhood is . Perhaps its the kind of midlife crisis that boyracers have... ...they love putting stereos and big amps on their boats too!
Each to their own I suppose - although I guess your point is if you are going to jump waves buy a big petrol outboard. If you want a diesel jet - you are probably not wanting to jump waves anyway.
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