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Old 20 January 2008, 09:10   #1
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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

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jtm
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Old 20 January 2008, 10:17   #2
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Looks suspiciously like the Isuzu 2.8 diesel in there.
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Old 20 January 2008, 11:54   #3
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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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Old 20 January 2008, 12:22   #4
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The general feeling was ...
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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Old 20 January 2008, 13:46   #5
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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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Old 20 January 2008, 13:58   #6
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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.

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Old 20 January 2008, 18:32   #7
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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.
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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Old 20 January 2008, 18:39   #8
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Originally Posted by prairie tuber View Post
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.
You have a point. The 109hp version in my car doesn't even have an intercooler.
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Old 20 January 2008, 18:41   #9
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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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Old 20 January 2008, 18:56   #10
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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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