Actually, the water jets, or 'drives' as you put on this specific ship do not fully sit below the water when the ship is stationary, about three quarters of the jets are submerged though. This is unlike Incat fast ferrys whos jets do sit fully underwater when staionary
looks like the jets are in a perfect position, right on the water line, putting them under water would create a shitload of drag i would think. they aren't sitting in the water because of the forward motion, if the ship was stationary you would see the drives below the water.
4 General Electric Gas Turbines giving 100,000 hp, 4 Rolls Royce Water Jets. Ship has a 19,600 tons operating weight and 40 knots crusing speed. "Stena Voyager" Very impressive watching the jets from the viewing area!
yo there not jets there impellers inside of special composite pipes tubes whatever you want t call them and the engine what ever kind it is rotax or just a regular v piston engine it forces the water into a smaller space and than ejects it out through the "jet" nozzle. The same as my seadoo speedster.and misterbaz1 is correct
Yes and no. Both use a jet with an impeller to create thrust, but the difference is the fact that the water jet does not generate it's own power, but is instead connected to a separate engine connected via a shaft. Case in point, the boat can stop the jets with the engines still running, whereas a jet plane cannot turn off the thrust all the way as that is what creates the combustion and the engines would die or "flame out". Both use impellers in the jet design though, and are very similar.
are you sure that this ferry isn't powerd by lycoming turbines? I agree a jet pump is not a jet engine. Im sure you wouldn't be so tough in person. What is the point of internet bashing?
By your own definition, this would qualify as a jet in that it is producing thrust by the rearward exhaust of a fluid, in this case, water. What you are thinking of is a specific type of jet, the turbojet or turbofan. In this case, the vessel uses a pump-jet. As for your second remark, oh grow up...
Propulsion isn't from pushing the water from the boat against the stationary water you are in. Propulsion is derived from forcing the water away FROM you in order to push you forward. The water coming out of the jets is what propels the boat forward, not the water coming out of the jets impacting the water you are riding on.
How do rockets take off? It isn't from the fuel pushing against the launch pad or air particles. It is the force of the fuel EXITING the nozzle that gives it thrust.
Think of a classic prop on a boat. You get forward momentum from the prop pushing water OFF of the blade, not pushing the water against more water the boat is in.
And they are actually modified jet engines that are used in this ship, which are called gas turbines, the ship has 2 × GE LM2500 gas turbines, modifed engines to what are found on the Boeing 747, and 2 × GE LM1600 gas turbines which are modified to what are found in a european jet fighter.
There is no wasted thrust there at all, remeber for every action there is an equal and opposite reaction, think of it when you turn a hose pipe on and your not holding the hose, generally the hose will move all over the place, as the jet of water is providing thrust, exactly the same principle is used here, just on a much bigger scale, and if u wanna look up details, this ship is the Stena HSS 1500 (worlds largest fast ferry)
why would it make it inefficient? I'm not saying that your wrong by he way i just want to know. To me it seems logical for the water outlet to be under water. it's giving the pressurised water a denser object to push against there for providing more thrust. It's like can you move away from a wall faster by pushing the wall to push yourself away from the wall, or pushing the air between you and the wall
a single propeller based drive system? my boat does exactly that lol apart from the cooling water obviously. i assume you mean a jet drive? isn't a jet ski just that?
those arent jet engines. jet engines are exhaust based propulsion seen on jet fighters and what not. those are either diesels or turbines hooked up to water jet drives.
we had those thruster engines in our workshop for maintenence and they were incredible bit of kit. frightening power
allistairc123 5 months ago
It has 4 Jet engines just as you would find on a Boeing 747!! Stena have already sold the HSS and 2 new superferries will be introduced in Autumn 11
warcad1 7 months ago
so its just a propeller thrusting water out of the back. powered by what? a diesel or a turbine engine?
oipbhakeld 7 months ago
Actually, the water jets, or 'drives' as you put on this specific ship do not fully sit below the water when the ship is stationary, about three quarters of the jets are submerged though. This is unlike Incat fast ferrys whos jets do sit fully underwater when staionary
danhss 1 year ago
looks like the jets are in a perfect position, right on the water line, putting them under water would create a shitload of drag i would think. they aren't sitting in the water because of the forward motion, if the ship was stationary you would see the drives below the water.
asuperv27 1 year ago
4 General Electric Gas Turbines giving 100,000 hp, 4 Rolls Royce Water Jets. Ship has a 19,600 tons operating weight and 40 knots crusing speed. "Stena Voyager" Very impressive watching the jets from the viewing area!
alastairmclellan 1 year ago
yo there not jets there impellers inside of special composite pipes tubes whatever you want t call them and the engine what ever kind it is rotax or just a regular v piston engine it forces the water into a smaller space and than ejects it out through the "jet" nozzle. The same as my seadoo speedster.and misterbaz1 is correct
maxdogtim8888821 3 years ago
thus creating a JET.
jet airplanes take air a spit it out faster and stronger. jet skis do the same thing but with water...
Elitefrr 2 years ago
Yes and no. Both use a jet with an impeller to create thrust, but the difference is the fact that the water jet does not generate it's own power, but is instead connected to a separate engine connected via a shaft. Case in point, the boat can stop the jets with the engines still running, whereas a jet plane cannot turn off the thrust all the way as that is what creates the combustion and the engines would die or "flame out". Both use impellers in the jet design though, and are very similar.
travelbytommy 2 years ago
Yeah it doesn't say jet TURBINE
VancouverCanucksRock 2 years ago
That is , KaWeMa Waterjets
Basis211nsl 2 years ago
yeah that is what a jet is
asuperv27 2 years ago
your a fucking idiot the guy put the title as jet engines thats all i am saying they are not jet engines this is the definition of a jet engine
jet engine
noun
an engine, as an aircraft engine, that produces forward motion by the rearward exhaust of a jet of fluid or heated air and gases.
so fuck you, you faggot -fag⋅got2 [fag-uht] Show IPA
noun
Slang: Disparaging and Offensive. a male homosexual.
Origin:
191015, Americanism
maxdogtim8888821 2 years ago
are you sure that this ferry isn't powerd by lycoming turbines? I agree a jet pump is not a jet engine. Im sure you wouldn't be so tough in person. What is the point of internet bashing?
asuperv27 2 years ago
By your own definition, this would qualify as a jet in that it is producing thrust by the rearward exhaust of a fluid, in this case, water. What you are thinking of is a specific type of jet, the turbojet or turbofan. In this case, the vessel uses a pump-jet. As for your second remark, oh grow up...
AniZaeger 2 years ago
wouldnt it be more afficient if they put the jets under water coz water is denser
cr125lover69 3 years ago
Propulsion isn't from pushing the water from the boat against the stationary water you are in. Propulsion is derived from forcing the water away FROM you in order to push you forward. The water coming out of the jets is what propels the boat forward, not the water coming out of the jets impacting the water you are riding on.
MisterBaz1 3 years ago
i disagree quite strongly
powerfulsamoan 3 years ago
Then take a college physics class and come back.
How do rockets take off? It isn't from the fuel pushing against the launch pad or air particles. It is the force of the fuel EXITING the nozzle that gives it thrust.
Think of a classic prop on a boat. You get forward momentum from the prop pushing water OFF of the blade, not pushing the water against more water the boat is in.
MisterBaz1 3 years ago
i still disagree
powerfulsamoan 3 years ago
Ignorance is bliss I guess.
MisterBaz1 3 years ago
if your way was right the engineers that spent millions reaserching this would do it that way, there is a reason they are the way they are
asuperv27 2 years ago
you are correct. A helicopter gets its lift/thrust from propelling air downwards,via low pressures, etc.... not pushing the air against the ground...
DHUNT571 2 years ago
its a waterjet
malswam 3 years ago
lol i was on a trip from finland to somewhere, the boat had like 2-3 times more powerful engines than that.
hulluhomer2 3 years ago
Thing halls too for such a big ferry
johnkimble2007 3 years ago
Extreme!
MetalOfRock 3 years ago
And they are actually modified jet engines that are used in this ship, which are called gas turbines, the ship has 2 × GE LM2500 gas turbines, modifed engines to what are found on the Boeing 747, and 2 × GE LM1600 gas turbines which are modified to what are found in a european jet fighter.
danhss 4 years ago
There is no wasted thrust there at all, remeber for every action there is an equal and opposite reaction, think of it when you turn a hose pipe on and your not holding the hose, generally the hose will move all over the place, as the jet of water is providing thrust, exactly the same principle is used here, just on a much bigger scale, and if u wanna look up details, this ship is the Stena HSS 1500 (worlds largest fast ferry)
danhss 4 years ago
diesel powered turbines not jet engines.
it seems silly that most of the water is being blasted out above water level, wasted thrust
JSSV 4 years ago
I would love to know of a single impeller based drive system that expells all of it's water below the surface when in motion.
lsucowboy 4 years ago
that would be very inefficient, thus making it a bad idea.
doctorluigi 3 years ago
why would it make it inefficient? I'm not saying that your wrong by he way i just want to know. To me it seems logical for the water outlet to be under water. it's giving the pressurised water a denser object to push against there for providing more thrust. It's like can you move away from a wall faster by pushing the wall to push yourself away from the wall, or pushing the air between you and the wall
JSSV 2 years ago
a single propeller based drive system? my boat does exactly that lol apart from the cooling water obviously. i assume you mean a jet drive? isn't a jet ski just that?
JSSV 2 years ago
those arent jet engines. jet engines are exhaust based propulsion seen on jet fighters and what not. those are either diesels or turbines hooked up to water jet drives.
adjsfkljoiragiol 4 years ago
or to put it simple its a Big Ass jetski.
kevobuddy10 3 years ago