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Old 12 September 2005, 09:13   #11
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What are jets like in rough seas? Do they lose grip and cavitate like mad? I suppose a lot depends on the size of boat though.
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Old 12 September 2005, 09:23   #12
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Our jet drive boat weighs 4 tonnes so it doesn't come out of the water that easily and we have found it fin ein Rough seas. when it does come out of the water it doesn't seem to flounder upon splash down!

The boat I drive in the North Sea is a 12 metre 10 ton Rib and again that dosn't come out that easily.

If the weather blows up this week I'll take the Avon out and se what happens in a rougher sea
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Old 12 September 2005, 10:33   #13
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Quote:
Originally Posted by Rogue Wave
If the weather blows up this week I'll take the Avon out and se what happens in a rougher sea

I think i'll have to come too, so as I can keep an eye on you
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Old 12 September 2005, 10:37   #14
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Old 13 September 2005, 00:45   #15
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Quote:
Originally Posted by Rogue Wave
The boat I drive in the North Sea is a 12 metre 10 ton Rib and again that dosn't come out that easily.
I imagine that would take some doing to launch that monster throught the air


nik,

What sort of engine power range are you thinking of? There is one interesting variation of the traditional jet outboards called the jetpac

There is also a very simple but neat 55hp outboard that is a hybrid of a prop & jet drive that the U.S navy on their 16 foot SIBs. Unfortunately this system is only made for 2 stroke OMC engines. There is a description of these at smalloutboards.com I am quite curious how the performance of this compares to that of a conventional prop system. Here are some pictures of it.
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Old 13 September 2005, 03:49   #16
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I'm sure either Mercury or Yamaha make a jet drive outboard, sounds like you could have a lot of fun with a drive like that!
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Old 13 September 2005, 09:13   #17
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Like this?

It's a yam but is I think the 115 block, less apendage drag than the curious US military job.
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Old 13 September 2005, 09:44   #18
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And here is a Mercury. These jet pumps come from the same manufacturer in the States and are made to fit most outboard brands

The jets are most suited for shallow water ie shallow rivers or for the emergency services when operating in flooded areas

we have recently supplied to our Dutch distributor our Parker 510 rib with jet outboard for rescue services. will try and get some pictures
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Old 13 September 2005, 10:33   #19
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whilst deciding what rib to buy I spoke to a top end manufacturer about jet drives thinking that they are safer than a prop which they are when stationery or going very slow but his response was that in anything less than 7m it was not advisable as you lost a certain degree of steerage at low speed in addition if you hit someone at speed the hull is going to kill them before they get minced in the prop
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Old 13 September 2005, 12:35   #20
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Just a thought- has anyone tried fitting a jetski engine into a small rib? I was daydreaming yesterday about the possibility of fitting a 120hp seadoo lump into my sr4 (just for the hell of it...y'know...)
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