i do not own a boat, i didnt even know what a hamilton water jet was. i have homework i should be doing, why did i watch this video all the way through?
roughly, the efficiency of a jet drive is about half of the efficiency of a propeller in the same conditions and it is understandable as when the boat gains speed, the propeller act more like a screw biting in the incoming water when the jet continues to break the incoming water stream and always redirects the flow to insure propulsion and steering
The jet drive is kool but a prop at speed is much more efficient. Now a variable vane impeller could close that gap immensly. Variable vane geometry is the answer. Like in variable vane turbochargers. Constant speed geometry makes for a very efficient impeller. Just kicking the math around .
No, actually it is much more efficient. The reason you are using so much fuel is you are trying to get max velocity rather than max volume of water. The Hamilton is a 3 stage turbine, with three stator blades that align the water so that it hits the moving blade(s) at the best angle. A outboard has high slippage sometimes as much as 30% but the Hamilton is down around 10-15%. You are probably running either a Jacuzzi or a Berkley pump, which only has a single stage and is made for speed, not power. The Hamilton is built just the opposite, major power but not high speed. My father was one of the first distributors of the Hamilton jet drive in the US and I am more than a bit familiar with them. I still have a jet 32 pump and tail gate.
Hamilton doesn't produce 3 stage waterjets any more. Today there are only one stage models in the list due to their commercial potential, reliability and redundancy. Hamilton waterjets a far more efficient in a low and middle speed range then others waterjets so they are quite popular in many kind of a work boat segments.
I will admit that I have never drove a boat that had a Hamilton, but I have owned and drove many boats with different drives (Living in Lake Havasu for 30 years) including: Berkeley, Dominator, Jacuzzi, Panther, American Turbine, Volvo Penta, Mercruiser, Cobra, Mercury, Evinrude, Johnson, V-drives, etc, etc, etc, etc. I don't agree with your blanket statement. The weight and size of the boat along with intended use varies a lot. On I/O's and outboards you can easily adjust the trim to get maximum efficiency (yes I know you can get things like a Jetavator, drop snoot, etc to get a different angle with jets) and you can get alot less slip than 30% given the pitch and diameter is correct. Possibly as low as 5% in a light boat at high speeds. With all that being said from my experience a propped boat is way more efficient than a jet. The Mercruiser I/O Bravo 3 dual with dual counter rotating props is one of the best I've ever seen at lower speeds. The reason ships use a prop and not a jet. But what do I know?
Plus when I say efficiency I'm not just talking about slip I'm talking about the amount of power it takes to turn a pump as opposed to a prop. It takes way more power to turn a pump. Plus they easily cavitate compared to a prop in certain rough water conditions which dramatically lowers the efficiency. Jets have their place but it's mainly for shallow water.
You may have a unsuccessful waterjet or pretty old model or both of these. Waterjet is more efficient than props and it's proved. High propulsive coefficient is not the only advantage
Mattessj There could be a mismatch between the engine and the jet unit or something could be disrupting the water flow through the system. Both hane an impact on fuel consumption.
+Mattessj it shouldn't make much difference if they are match together n to the hull too but if u have a big torque engine driving a small impeller jet unit on a smallish boat u be wasting tons of fuel, for me 2 jet driven boats i had both where far better than the thirsty two stroke outboards i had B4 more reliable n far cheaper to maintain/repair too after all they are marinized car engines
You ought to look into HamiltonJet's reference list which is impressive and consist of far than 60k units worldwide (3 years old information). Most of the vessels are commercial type. I doubt operators would waste money utilizing inefficient vessels 24/7. Meanwhile it is true, waterjets are less efficient (if you compare only propulsion coefficient) than the most propellers solutions on speeds up to 20 knots averagely and this is not a secret and never hided. Nevertheless efficiency of different makers differs, sometime with a gap of 35%. I bet you never compared efficiency of Ferrari with CATERPILLAR's. Anything has its purpose. By the way, most of high speed vessels in 25-50 knots speed range are jetboats.
If your impeller is worn n there is gap between the housing n the impeller you will lose power n efficiency If your impeller is Metal an engineering shop will be able to build is up (welding) then machine it to its original tolerances there is No way a jet unit is half as efficient as a prop n you have the added safety yoo
I don't care what anyone says, we've had several boats and all the jet drives get horrible gas mileage. Regardless of size, shape, weight, driving habits. Just look at jet skis
And if you were using a 3 stage instead of the single stages that are on the boats you listed (jet skis I mean) you would find they get great fuel mileage.
i never had a Hamilton jet but i had a PP6 jet driven boat and a Castolti 05 jet units both powered with a ford V6 essex engine but on different hull boats which makes it a little hard to compare the jets the PP jet was Brilliant at high speed maneuverability but was really struggling to get on the plane the Castolti jet was much better n effortless getting the boat on the plane no hump to clime kind of thing best way i can think of describing it but at high speed maneuvering was nothing as good as the PP6 was both almost identical top speed even the Castolti driven boat was heavier as it was about 2.5 feet longer both single stage jet pumps for me the best thing going for jets are safety no props to injured or worse anyone as for performance so far as i know a jet driven boat won one race against props it was a Castolti driven jet boat if i remember right it was driven by Mike Balami they had a nice machine n marine shop near Brighton n where Very very helpful people to deal with i remember the shop name now it came to me Lancing Marine
I thought impellers accelerate water to the sides, but he called the thing in the Hamilton Waterjet an impeller when it looks more like a propeller accelerating water directly backwards.
It's been around for 70 years. It's very well researched and widely adopted. Most fast cat type ferries are waterjets. They are also used extensively in oil rig tenders.
I'm right there with ya. That's exactly what I'd do for a homebuilt jet boat. But to answer dude's question, no, a conventional prop would not work. There is an inboard (usually V-drive) called a Tunnel Drive where the boat's hull halfway encompasses the prop. This sort of protects the prop. Also look at Ven T Boats. Their set-up is exactly what he wants.
I do, and I'm the one that animated it. As I remember it was one of the last shots and I simply ran out of time after rendering it to redo. I'd probably had about enough of the job by then too, to be fair. ;)
Nope. The intake is flush with the bottom of the hull. Nothing extends deeper than the hull. There can be a small rudder fin mounted on the bottom of the steering nozzle, but this is not common.
I love the acceleration and the fun you can have on these boats, but if you have really tight docking areas, being able to turn while coasting or when not under power is crucial. But yes, I have seen small rudders mounted on the nozzle.
Jets need the power on when manoeuvring, as they rely on the water velocity for the steering. Long ago, in another lifetime, I owned a garage/service station in the Bay of Plenty, in the North Island of New Zealand. Two of my customers - brothers from out of town - bought a Hamilton 83 boat, with a 350 V.I. Chev and a 3-stage jet unit. Their previous boat had been a conventional propellor and rudder setup. So, on their first trip out to sea, over the Whakatane River bar, they nearly came a cropper, because they tried to drive the jet the same way as their old boat - by throttling off and expecting the jet to keep steering. You have to keep the power on all the time to have control. It was a quick lesson for them and they never did that again.
i do not own a boat, i didnt even know what a hamilton water jet was. i have homework i should be doing, why did i watch this video all the way through?
"why did i watch this video all the way through?
Because you learned something new?
Nothing wrong with that.
Because knowledge is all!
DontPhearThisReaper Because you are a natural born water person.
do your work..and you can design this someday
Same
Great tip at the end. 'Don't make a hole in your boat below the waterline.'
And by the way, as someone else already stated, the Hamilton was built in New Zealand as a work boat for gathering moss of all things.
Very useful propulsion system in the shallow rivers in the South Island. A flat bottom jet boat will plane in 100 mm of water.
gathering moss????
Now I want a Hamilton Water Jet, got no boat though.
Just like me^^
Wow, this was super informative.
A very interesting short...now I understand my Greece waterjet ferries Thanks
Very informative , thank you.
roughly, the efficiency of a jet drive is about half of the efficiency of a propeller in the same conditions and it is understandable as when the boat gains speed, the propeller act more like a screw biting in the incoming water when the jet continues to break the incoming water stream and always redirects the flow to insure propulsion and steering
The jet drive is kool but a prop at speed is much more efficient.
Now a variable vane impeller could close that gap immensly.
Variable vane geometry is the answer. Like in variable vane turbochargers. Constant speed geometry makes for a very efficient impeller. Just kicking the math around .
6:30
Cooling system for dermis burns aqueous solutions systems
No, actually it is much more efficient. The reason you are using so much fuel is you are trying to get max velocity rather than max volume of water. The Hamilton is a 3 stage turbine, with three stator blades that align the water so that it hits the moving blade(s) at the best angle. A outboard has high slippage sometimes as much as 30% but the Hamilton is down around 10-15%. You are probably running either a Jacuzzi or a Berkley pump, which only has a single stage and is made for speed, not power. The Hamilton is built just the opposite, major power but not high speed. My father was one of the first distributors of the Hamilton jet drive in the US and I am more than a bit familiar with them. I still have a jet 32 pump and tail gate.
Hamilton doesn't produce 3 stage waterjets any more. Today there are only one stage models in the list due to their commercial potential, reliability and redundancy. Hamilton waterjets a far more efficient in a low and middle speed range then others waterjets so they are quite popular in many kind of a work boat segments.
Wrong
ezkieler850 really. like your facts you back up your statement with. and somehow doubt you have ever used one or both (I have).
I will admit that I have never drove a boat that had a Hamilton, but I have owned and drove many boats with different drives (Living in Lake Havasu for 30 years) including: Berkeley, Dominator, Jacuzzi, Panther, American Turbine, Volvo Penta, Mercruiser, Cobra, Mercury, Evinrude, Johnson, V-drives, etc, etc, etc, etc.
I don't agree with your blanket statement. The weight and size of the boat along with intended use varies a lot. On I/O's and outboards you can easily adjust the trim to get maximum efficiency (yes I know you can get things like a Jetavator, drop snoot, etc to get a different angle with jets) and you can get alot less slip than 30% given the pitch and diameter is correct. Possibly as low as 5% in a light boat at high speeds.
With all that being said from my experience a propped boat is way more efficient than a jet. The Mercruiser I/O Bravo 3 dual with dual counter rotating props is one of the best I've ever seen at lower speeds. The reason ships use a prop and not a jet. But what do I know?
Plus when I say efficiency I'm not just talking about slip I'm talking about the amount of power it takes to turn a pump as opposed to a prop. It takes way more power to turn a pump. Plus they easily cavitate compared to a prop in certain rough water conditions which dramatically lowers the efficiency. Jets have their place but it's mainly for shallow water.
water jet drive is way more inefficient than conventional prop...i own a jetboat.. pretty much double fuel consumption
You may have a unsuccessful waterjet or pretty old model or both of these. Waterjet is more efficient than props and it's proved. High propulsive coefficient is not the only advantage
Mattessj There could be a mismatch between the engine and the jet unit or something could be disrupting the water flow through the system. Both hane an impact on fuel consumption.
+Mattessj it shouldn't make much difference if they are match together n to the hull too but if u have a big torque engine driving a small impeller jet unit on a smallish boat u be wasting tons of fuel, for me 2 jet driven boats i had both where far better than the thirsty two stroke outboards i had B4 more reliable n far cheaper to maintain/repair too after all they are marinized car engines
You ought to look into HamiltonJet's reference list which is impressive and consist of far than 60k units worldwide (3 years old information). Most of the vessels are commercial type. I doubt operators would waste money utilizing inefficient vessels 24/7. Meanwhile it is true, waterjets are less efficient (if you compare only propulsion coefficient) than the most propellers solutions on speeds up to 20 knots averagely and this is not a secret and never hided. Nevertheless efficiency of different makers differs, sometime with a gap of 35%. I bet you never compared efficiency of Ferrari with CATERPILLAR's. Anything has its purpose. By the way, most of high speed vessels in 25-50 knots speed range are jetboats.
If your impeller is worn n there is gap between the housing n the impeller you will lose power n efficiency If your impeller is Metal an engineering shop will be able to build is up (welding) then machine it to its original tolerances there is No way a jet unit is half as efficient as a prop n you have the added safety yoo
fantastic animation😃
I don't care what anyone says, we've had several boats and all the jet drives get horrible gas mileage. Regardless of size, shape, weight, driving habits. Just look at jet skis
Disadvantage which does not outweigh all of the advantages. Your point?
Point being if you have the money drive whatever the fuk you want
And if you were using a 3 stage instead of the single stages that are on the boats you listed (jet skis I mean) you would find they get great fuel mileage.
Im not an engineer. If someone is willing to let me borrow their 3 stage jet drive boat for testing then I would change my opinion.
Bob Swagger right, so I can ride with you
very inspiring for my work!
it's like throwing rock to move forward on the ground!
Always wondered how these work.
They should make a version of this video with English or at the least with English subtitles.
What are you on?
kwerk2011
I am on a chair, currently.
Maybe you should learn to speak it properly first then? Idiot.
The joke
_________
Your head
Guy Parris for God's sake. Yes
Very cool!
What an amazing "woulder jatt"!
Superb precision. Dark Matter light systems upgrades?
Hamilton's - water way to have a good time!
4:19 proper flow design if the turbine still works without a compressor stall.
this is ingenious.
i never had a Hamilton jet but i had a PP6 jet driven boat and a Castolti 05 jet units both powered with a ford V6 essex engine but on different hull boats which makes it a little hard to compare the jets the PP jet was Brilliant at high speed maneuverability but was really struggling to get on the plane the Castolti jet was much better n effortless getting the boat on the plane no hump to clime kind of thing best way i can think of describing it but at high speed maneuvering was nothing as good as the PP6 was both almost identical top speed even the Castolti driven boat was heavier as it was about 2.5 feet longer both single stage jet pumps for me the best thing going for jets are safety no props to injured or worse anyone as for performance so far as i know a jet driven boat won one race against props it was a Castolti driven jet boat if i remember right it was driven by Mike Balami they had a nice machine n marine shop near Brighton n where Very very helpful people to deal with i remember the shop name now it came to me Lancing Marine
Cool video! 😎 I've got some Hamilton info on my channel, rebuilding and fixes. This is great information!
I thought impellers accelerate water to the sides, but he called the thing in the Hamilton Waterjet an impeller when it looks more like a propeller accelerating water directly backwards.
Invented by a New Zealander, go kiwi!
Hamilton NZ is the city near where I live, and we won the Americas cup again! We are people designed for the water
The founder was Charles Hamilton, he lived in South Canterbury. It was invented to cope with the classic South Island shallow braided river.
I need one for my canoe.
Amazing!
I wonder how they'd work on a low speed boat, like the British narrow boats used on their canal system.
Cool Video!!!
Brilliant
Those hands are creepy. I used the Jacuzzi versions of these on patrol craft. It is the way to go without question.
nice video
nice explained
It is a Capital idea and deserves Intensive Research at Heavy Duty levels, relieving Propellers and Rudders. Could it be employed by large Vessels?
It's been around for 70 years. It's very well researched and widely adopted. Most fast cat type ferries are waterjets. They are also used extensively in oil rig tenders.
Would a geared transmission make this system more efficient? Like in an Automobile?
Nope. Waterjet is a pump and its impeller matched on fixed maximum RPM, so that changing RPM is useless
Adding contrarotary via planetary gears second propeller should not increase efficiency?
Good for large marine life
Thats fucking cool. I want one and i dont even own a boat
water friction utrasound equal heat generator wich mean thrust. my very best regards. R
Very Informative propulsion system can it be driven by any marine engine?
Yes, it can.
Out of curiosity, would the engine work better at higher speeds?
Hey!, you guys got one of these for sailboats?
this is meme material
If only they could make it cheaper than conventional / older design propulsion.
nice
I came expecting Alexander Hamilton.
fuckin sick brah send it
Hello Mr. Miller!
Water jet operations are more faster than other boat.
4:46 sweeeeeeeeeeet
Does this motor have a hit musical?
soon as this system wil be cheaper to produce, propellers will no longer be seen on any boat, waterjet is the future.
Lol not really
Why do we not see outboard water jets?
water jet drive is way more inefficient than cpp on maintenance cost in south korea Navy.
Jet ski!
HYDRODYNAMICALLY DESIGNED
He keeps saying "water jit"
I think I'll buy a boat
would this system work with a conventional propeller? what i want to do ist a mini-boat for one person with a 4 stroke motor and 6 hp... thank you
since nobody replied, I would say no, your best option would be to buy an old jetski and scavenge the parts if you wanted a small jetboat.. IMO.
You'd be wayyyyy past the 6hp range. !!!LoL!!!
Jason T Hahaha true.. But Surely nobody really wants a 6hp jetboat :D
I'm right there with ya. That's exactly what I'd do for a homebuilt jet boat. But to answer dude's question, no, a conventional prop would not work. There is an inboard (usually V-drive) called a Tunnel Drive where the boat's hull halfway encompasses the prop. This sort of protects the prop. Also look at Ven T Boats. Their set-up is exactly what he wants.
Does this system would stop cavitation if used in subs?
M Wasim pervez Jaan modern subs have waterjets. At least in Russia
How muchthe. Water jet..
Hamiltin jit water jit.
That's one expensive pump and hose.
Wow
What i would like to know is how does this propulsion system compare to a hamster in a wheel?
ky sputnik spectacular
The Hamilton squirts farther than any hamster!
Hi, what software simulator name ? Thank you !
Lightwave. Not simulated, modeled.
A new Zealand invention..
did anyone else feel nausea when watching the graphics at 3:03 to 3:14?
Ritz Matt ...just found the boat-surface-drag-coefficient. A massiv delay in accelerating.
I do, and I'm the one that animated it. As I remember it was one of the last shots and I simply ran out of time after rendering it to redo. I'd probably had about enough of the job by then too, to be fair. ;)
Hahaha, now that you mentioned it
Good for fisherman, using Gil. Net fishing, moving slowly. Left and right,,
Im fisherman,,,
1:49 name of the boat please.
Lady Elizabeth IV Police Patrol Boat
LOCATION: Wellington, New Zealand
I thought about this set up when I was12 yrs old whats the big deal ?
Why is this in my notification?
But can you turn while coasting? No.
Well won't the intake be somewhat working as long as you're moving?
Nope. The intake is flush with the bottom of the hull. Nothing extends deeper than the hull. There can be a small rudder fin mounted on the bottom of the steering nozzle, but this is not common.
I love the acceleration and the fun you can have on these boats, but if you have really tight docking areas, being able to turn while coasting or when not under power is crucial. But yes, I have seen small rudders mounted on the nozzle.
Jets need the power on when manoeuvring, as they rely on the water velocity for the steering. Long ago, in another lifetime, I owned a garage/service station in the Bay of Plenty, in the North Island of New Zealand. Two of my customers - brothers from out of town - bought a Hamilton 83 boat, with a 350 V.I. Chev and a 3-stage jet unit. Their previous boat had been a conventional propellor and rudder setup.
So, on their first trip out to sea, over the Whakatane River bar, they nearly came a cropper, because they tried to drive the jet the same way as their old boat - by throttling off and expecting the jet to keep steering. You have to keep the power on all the time to have control.
It was a quick lesson for them and they never did that again.
what the hell is a vissil?
Wohtahjit pohwid vissil.
why don't we use these on all ships?
grounds grounds price
yes an average water jet without the motor costs 10 grand or more and thats for a small one that could fit in a 20ft boat
*Visel*
kroiky !
Wrong country.
Oi, This is amouzing, ya!
It's a kangaroo or kiwi accent? i always mix them up.
gary851 ....I was expecting cockney but its some kind of a softer british accent. Kinda posh, tho.
Kiwi. Waterjets were invented in NZ.
UA-cam...UA-cam man.. Why the fuck am I watching this?
"Veesil"
Hahaha 0:01
Russia make a English? IDK
eddie
TOO BAD IT USES SO MUCH GAS....VERY inefficient ......just like a Berkley Jet ....
Side stream intake systemsupgrades
It's good because it is computer-designed!
wtf is a viesel?
Water jit*
Gu'day m9
What the ****s a "jit", "ingine" etc?
nz accent
Go's to shoe there's noting I wouldn't watch in my recommended
Galss engines
I clicked the video to learn about a "water jet", but all it talked about was a "watta jit". Clickbait. Thumbs down.