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Old 26 January 2007, 17:15   #31
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Actually, that's not what I said. I said to be "guided", not "decide" because the wrong choice would be a disaster. IMVHO, The performance you want is going to be quite expensive in jets simply because they will suck soo much power at the performance range you're looking at, so you'll need BIG motors and BIG jets.

Plus, if you fit surface drives, surely they'll still suffer from weed etc as much as outdrives? But then if you're looking as 60+ knots, I reckon you're in the 800+hp range anyway which I suspect would be more than you want to put through outdrives on diesel. So it seems to come back to, if you "need" to go that fast, on a bot that size, surface drives are your most logical choice. It's a shame arneson are so expensive, but you do get what you pay for. Have you been in touch with them - I'm trying to remember the name of the guy to speak to - Rick Wimp rings a bell.

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madmat
your comment "why dont you let adam decide the drive unit" ofcourse adam will have a huge part to play with the spec of the rib however if you are spending the money and time that i am on the rib its quite nice to talk with friends about what possible drives i can use to propel the rib, plus if i want to be told how my rib looked, worked etc i would not be using adam on the other side of the world i would just get another scorpion. the outboard option is just out of the question on my rib but i could get interested in the passenger rib haveng outboards.

got any pics of your rib? what engines do you run?
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Old 26 January 2007, 17:19   #32
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Never seen one on a boat, but have seen them on a demo rig - looked pretty flimsy to be honest. Codders just came up with the other name I was trying to remember - trimax. Fabio Buzzi knows a thing or 2 about putting monster diesel power through surface drives.

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Hi people

does anyone know of these guys (http://www.pulsedrive.net/index.htm)? they have fitted a scorpion out and few other ribs.
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Old 26 January 2007, 17:22   #33
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hi pop,

i'll be keeping an eye on this thread, looks interesting. Cheers for helping out Thom a few weeks back, he said you're a top chap

Tim
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Old 26 January 2007, 20:58   #34
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hi guys

John thanks ill have a look through the threads thanks.

codprawn: i have looked at trimax,they look very simple which i like . the sea rex looks like the one, i will send them an email asking cost ect. i will post my finding here. thanks

mad mat: sorry i thought i read "decide" its the good old dyslexia( did i spell it right?) coming back into play. you are right i will let adam guide me to a certain degree however i like to cost things up and get it clear in my mind exactly what i want then i can move onto the next stage. on the point of maintance no sterndrives are no way near the same problem, my friend/competition (b$st!rd) runs the http://www.excitor.co.nz/ and the maintance on the surface drives are minimal, the drive he runs are SF30 Seafury Surface Drives they seem to keep up well considering they are run each day, he pushes out 1,600hp.

slimtim: it was nice to have an english sense of humour, tom is a nice bloke, has he sorted a job back in the uk? if not tell him to get in touch i can have an ask around from over here. the NZ season is in full bore now so he could get sailing right away. i wish him good luk in the future. how is the island mate? i miss my mates back there and going for a surf on compton
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Old 28 January 2007, 07:49   #35
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Pop - see my answer on Boatmad!
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When a boat looks that good who needs tubes!!!
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Old 28 January 2007, 14:05   #36
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Pop - see my answer on Boatmad!
Funnily enough almost exactly what I said a little earlier.
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Old 28 January 2007, 15:32   #37
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Quote:
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I canít have stern drives as the sea creatures get in, on and around creating a major maintenance problem for me.
Just looking back at your original post . . .

Won't you have similar issues with surface drives?

John
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Old 28 January 2007, 17:25   #38
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Hi ribsters for the people who dont read boat mad,

sent an email to all drive manufacturers, I hope they get back to me with a price and on guarantees with their product. I'll let you know. The other option I could go for is what coders mentioned, the outboards, but my problem is that I don't have a petrol station, does anybody know where I can buy a big petrol storage tank on wheels? (i bet its cheeper then the surface drives) Then I have the opportunity of having outboards, which would be good from a maintenance point of view. Does anypone know how much fuel an F250 yamaha goes through?
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Old 28 January 2007, 20:52   #39
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Depends on the laws in NZ. I have a 400L diesel tank off a lorry in a trailer as a fuel bowser - you can also buy towed bowsers cheap enough but often it's the laws that stop you.

A 250hp outboard can use as much as 80L an hour at full bore - half that cruising.

The sort of money you have been talking you could use the military spec Evinrude ETEC outboards that will run on diesel or kerosene as well as petrol.
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Old 29 January 2007, 17:13   #40
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I have a searider surface drive on my aluminium boat, it weighs 7 tonne with 14 on board, does just under 40 knots, coupled to 460hp inboard - is a remarkable bit of machinery, and has been great - simple shaft drive basically, through gearbox, and out.
To say
Originally Posted by codprawn
Surface drives are great for long fast runs in calmish waters


Is in my mind complete bollocks, and comes for an old wifies tale. there are different ones about, but choose the one that will suit you?

Waterjets - i also have a procharter with one of these in, goes great, manouverabiliy is second to none, and have no problems apart from it does the complete opposite in reverse, than what you are used to - 390hp cruises at 24 knots, flat out 32 knots (ish) but i do agree they need allot of power, but have come on leaps and bounds in the last 6 years even...
Again back to the old wifies tale that anything with a waterjet on looks like this....


The pulsedrive carry on, have been attempted to get in touch with them - heard nothing, and will not attempt again, there are just as many moving bits in the thing as a watch, and would make a good guess at the majority of them going bang, in a very short space of time.

Pete
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