ive seen some horrible aluminuim mig welds.. a lot faster than the tig tho.
I think it cost my mate 1500 for the material time and welding it up
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ive seen some horrible aluminuim mig welds.. a lot faster than the tig tho.
I think it cost my mate 1500 for the material time and welding it up
Fo Spanners, Driving past one of the local engineering workshops I found these out side (and 1 inside, and one down the local river)
Attachment 16319
Attachment 16320
Attachment 16321
Attachment 16322
Attachment 16323
My mate built the two stacked on the trailer .
Top ones 8 ft 550 pole ski engine and unit . Weighs about 180kg and good for about 60 kmph
Bottom ones a 9 footer , 750 Kawasaki ski engine and unit . Weighs about 200 kg and good for 65-70 kmph depending on how rooted the unit is at the time .
Like a few guys now he prefers smaller 4 stoke car engines (Suzuki m15a /Toyota 1nzfe ) for reliability and noise .
If your set on using jetski engines plan on rebuilding a few of them .
Kawasaki 550 jet boat testing. - YouTube
Gotta love them 2strokes
8 foot kawasaki 550 powered jet boat - YouTube
I was set on a 1100cc 11" boat... The old boy thinks we need 14"...
Will do some more research
I like the 4st idea as less maint, but also like the 2st ski motors as less weight and have rebuild a few and like the kawasakis
Not going to build as dont have the time so will buy finished boat
Here they are in action from page 2 of this threadQuote:
Originally Posted by mohawk
http://youtu.be/gZW368z-l4o
Your old boys on to it and so are you , Ive got a 14 and a 10 and DONT want any more lol.Quote:
Originally Posted by Spanners
Looks like every man and his dog are fabricating the mini jetboats :cool:
U groove rollers, teflon liner and oversize tip. 3m lead better than 4m. Smaller MIGs are fine but a bit harder to setup as they don't have 1/2 volts increments.
Pulse MIGs rock
Quote:
Originally Posted by veitnamcam
I just got a little 150 amp mig from repco. Its got a plastic liner and says ok for 1.6 too 3mm ali so i will hav a wack at it and report back.
No one beats this dude. He is in a class of his own.
Goats small 3.0m jetboat for sale
Cos he has a tube channel?
He makes a great film , but the class is way more crowded than you realise , and has been for over 50 years mate.Quote:
Originally Posted by TeRei
Ali is soft. Using the V groove rollers will put "ears" along the wire and will constantly jam. Knurled rollers are for gasless wire. Straight Argon, not mixed or CO2. S/S wire brush, not mild steel as it will contaminate the ali with iron oxidesQuote:
Originally Posted by mohawk
I used to sell the gear. VC will tell you the realities of the processs
Tongue in cheek.:thumbsup:Quote:
Originally Posted by mohawk
Mint . Repco welder came witb plastic liner and all i did was run a file aroun the roller to smooth off tbe groove. We had no feedin issues at all and my boat builder said no worries basting 3 too 5 mm with it. He was quite surrprised actually.Quote:
Originally Posted by sako75
what about these.... 1500cc Plastic jetboat
Tuffjets.co.nz - Home of the world's southern most plastic jetboat - Tuff Jets Southland - The home of the best plastic jet boat that takes you where other boats won't
Ive been told they are pretty wet too ride in , and Ive never liked how much they seem too sell for either.
My little boat is 40 kg lighter , has more room inside and probably a lot cheaper too build .
Looks like I have sorted a hull... around 3.6m, might end up being 3.4 yet
Its a hull a guys down sth designed in cad and built, and is now scaling up. 1.5 at the chine.
Hes going to build his soon and if all ok I'll buy the plans and get a mates old man to lazer it out and will find someone local to weld it up.
Basically pic below scaled up 20%
Umming and arrring engine wise.
Was going to use a 1100 Kawasaki but speaking to a mate down sth thats done a couple of wireups in the, he seems to think the Suzuki M15A is the way to go.
Would be quieter, more fuel efficient, but heavier 100kg vs 70kg which I dont think makes that much difference, and would need to be marinised
Attachment 17144
looks mint. keep us up to date with build pics!
Going M15a Suzuki
Can't argue with $250 and 30,000km on the clock
They are worth nothing to the wreckers apparently as they never die
Bloody computer and map is worth 5 times the engine!!
What jet unit you putting in it?
Haven't sorted that jet.
Maybe big ski or used boat?
Don't know much about the boat ones at this stage
Id be lookin at a real big ski one or maybe bore the nozzel.
Also look at max working rpm of both motors, the 4 strokes (skis) usually run a reduction box to get pump rpm back down to 6 or 7k.
Bigger nozzle more out of the hole. Smaller more top speed.
With the extra weight and drag of a boat compared to a ski i imagine a bored nozzle and higher pitch impeller would make the most of it.
No doubt it would work just straight swapsi but might as well optimise pump for engine and boat.
4st skis are direct drive - 8k rpm ish factory.
I've rebuilt a couple if supercharged seadoos and was looking for a NA one when got put onto the Suzuki engine - which is lighter also, let alone so bloody cheap!
My only worry is car engine doesn't go that far rev wise. 7k ish but Scott and others have done the M15a no probs.
The boats actually end up weighing LESS that a ski
Less hull in water also with the boat due to reduced dead rise angle.
100hp through a 6" ski jet with suzuki will net around 70km/hr which is enough
The biggest thing is price of Suzuki engine, heaps quieter and uses about 1/4 fuel - huge number of plus's but would be nice to have another 20hp which the 2st has - even though not needed and the exhaust needs to be watercooled.
Then again - $4k less outweighs downside.
Will prob wire factory ecu in and have engine and running gear for under $1k vs going to a Haltech or similar which ecu alone is 1300 at cost let alone mapping time etc
Ah ok. When i had mine the 4st were just coming out and were pulling over 10 to get the hp.
I doubt the boats would be lighter than the one i had but yea could be lighter than the mega ship skis coming out now.
As far as speed its basicly surface area in the water that holds ya back, and you need x amount to feed the pump and be able to turn not slide.
Way back when i was into skis the world record for speed from a factory ski hull and worked factory pump and motor was 86mph.
Mine did an indicated 78 and gpsed 80mph.
15 min from the cut to Kiateritery beach in anything less than 2 foot chop :cool:
Seadoo RXP 2 seater is about 180kg
Guys are building ski motor 3m boats under that.
The dead rise angle on a boat is a lot less than a ski
Typically a boat will be faster than the ski the engine is out of.
There is some gopro footage somewhere from the transom showing about 300x500 of the Intake area touching the water and the rest of the hull 'floating' - pretty cool shot and a lot less than I thought
I still think I need to 'rent' you for a weekend to stitch the origami set together.
Prob work out best hr rate ever for you.
Will talk about it later :)
K
Im trying too get a M15a running with a Toyota 4af hei off the back of the cam and a carb set up. If it works (cant see why it shouldn't ) it should be cheap as hell.
If your boat weighs under 300kg its going too be too bloody thin IMO.
We have weighed 4 or 5 complete ready too go little boats , properly marinised with engine covers . only the little 8 and 9 footers (550 /750 kawa ) came close to 200 kg.
Mines 3mtr x 1180 with 5&10 mm bottom and 2-2.5 every where else and its 320 with a 100kg motor.
Just going off what mates have built and their indicated weight.
If you get stuck with the ignition/ecu side of things let me know and ill do what I can.
I did conversions etc for about 5 yrs and have it down pat IMO
It's pretty straight forward when you understand how it works as a package
Who's gonna be ya crash test dummy that test pilots this thing?
Me! ;)Quote:
Originally Posted by savageshooter
My hull 95% done : )
http://img.tapatalk.com/d/13/12/06/runahe9a.jpg
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Your actually going to put a motor and unit in this time and not use you Fred Flintstone feet thru the bottom like the last one eh?
Looks the berries mate!
Quote:
Originally Posted by R93
It's the norm on the coast ain't it? Box of piss and float down the river lol. This one will be sold after test run would change things on the next one in the hull.
Have torn off the front wind shield now didn't look right before straight, going for curved look.
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What motor and pump are you going to use?
The square ugly screens work on a boat that's under 1.4 beam from what I've seen in my research. wrapped which looks good and you lose the corners so to speak
Quote:
Originally Posted by Spanners
Just looks ugly after looking at it more to me so took it off. I think the front like this will look better on it............
new jet boat hull | Trade Me
Have a Mercury 2.5L 2smoker :D , unit well I also have a few options........... but not fully decided, Have 2 out of jet skis an a single an double stage colorados
1st part to the puzzle sorted - just picked up a Ultra 250 complete jetunit
Now to find a donky...
Here's what you want spanners. . . . .
Mate just brought a marathon boat for river runs, 1550hp money in the bank 230k on water any day. . . . .
http://img.tapatalk.com/d/14/01/21/4uhedaqa.jpg
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Na I'm good lol
Got a donk, now need to get finalized plans cut
Nice them let fun begin.
Yeah she's nasty, Grey Harbour to Taylorville bridge and back and bye bye 180L of fuel lol.
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