@konstantinos1012 That's right, they can change the pitch of the blade's hydraulically without changing Engine Rpm, reducing cavitation, loss of horsepower and increasing speed.
Sweet video! When I was a kid my dad took me around below the stern of a drydocked Huron class destroyer in the Canadian navy and I got to see the the props and rudder, but they were fixed pitch as I recall. Pretty awesome sight to a 7 yr old!
No it's not. In fact it's quit the opposite. At least with steam turbines. They usually only have a big reduction gear
and fixed propeller. And for astern propulsion they have another turbine for that purpose. Usually 1/10-1/8 of the power of the main turbine.
But gas turbines cant be started on their own. They need a starting motor to ignite them. And thats why they need variable pitch propeller. And most likely a clutch.
I guess I should have specified that I meant fossil fuel powered turbines, attached to aircraft, where reverse would be activated by altering the propeller's pitch, because you can't reverse the airflow, or the pitch of the internal rotors and stators, without a mechanism more complicated than CPP.
What would be the benefit of the controllable pitch over a fixed pitch prop adjusting shaft speed? Definately looks cool, but seems to me like just one more mechanism that can fail in the middle of the ocean.
@v12tommy If you have a constant speed engine (which is more efficient and simple to maintain and operate than a varible speed and/or reversible engine) then you need a variable pitch propeller.
biggest benefit will be that you have no minimum thrust. the FPP is run at the engine speed or with reduction gear. but it means that the engine needs a minimum rpm. for big engines this might be around 15-20 rpm.
the CPP can change the pitch by less than half a degree. that means you can have very very low thrust. and you are much faster with reversing.
for a FPP you have to stop the engine, move the camshaft, and start it again. takes more time.
One of those things fell off the U.S.S. Barbey, FF-1088, back about the mid 1980's. We had to take her place in a WESTPAC as ready duty destroyer because of that incident.
That should be "controllable" pitch propeller. Variable pitch indicates the pitch varying from the hub to the tip. Controllable means it can be controlled as in this video. Compare that to "fixed" pitch where the propeller has no movable parts. There is quite a difference (I'm not just picking nits)
the propeller blades r twisting to change the pitch in turn changing the amount of water they push, its used to control boat speed and forward/reverse direction instead of changing the rpms on the engine
it wasnt gonna start spinning.. just what u saw. you change the pitch angle of the proppeller blades to affect the movement of your ship and the speed of the movement..
@adamwoodhouse Large marine propellers do not rotate that fast, typically less than 200 rpm, and if you were standing in front of one of the blades when it began to turn you'd just be flipped out of the way.
is this the azimuth?
togcbu 1 week ago
Put it in reverse
n9zn 2 weeks ago
world biggest blender blade
donandroz 2 weeks ago
so high and low static pressure its not used only in aviation?
konstantinos1012 4 months ago
@konstantinos1012 That's right, they can change the pitch of the blade's hydraulically without changing Engine Rpm, reducing cavitation, loss of horsepower and increasing speed.
R00RAL 4 weeks ago
But, will it blend?
taitai907 6 months ago 3
@taitai907 That is the question.
fyadcorp 3 weeks ago
Sweet video! When I was a kid my dad took me around below the stern of a drydocked Huron class destroyer in the Canadian navy and I got to see the the props and rudder, but they were fixed pitch as I recall. Pretty awesome sight to a 7 yr old!
bagelboi66 6 months ago
Chuck Norris' window fan.
madisonelectronic 6 months ago
@madisonelectronic Nah its only fo his pet mouse.
dtiydr 6 months ago
@dtiydr Very good,
madisonelectronic 6 months ago
If you have a turbine engine as your powerplant, CPP is your only choice, realistically.
yudasgoat2000 1 year ago
@yudasgoat2000
No it's not. In fact it's quit the opposite. At least with steam turbines. They usually only have a big reduction gear
and fixed propeller. And for astern propulsion they have another turbine for that purpose. Usually 1/10-1/8 of the power of the main turbine.
But gas turbines cant be started on their own. They need a starting motor to ignite them. And thats why they need variable pitch propeller. And most likely a clutch.
maskinisten83 1 year ago
@maskinisten83
I guess I should have specified that I meant fossil fuel powered turbines, attached to aircraft, where reverse would be activated by altering the propeller's pitch, because you can't reverse the airflow, or the pitch of the internal rotors and stators, without a mechanism more complicated than CPP.
yudasgoat2000 1 year ago
thats where the striped marks on the whales back comes from...
Bodhihardinge95 1 year ago 3
shit imagine that thing starting up and standiing in the way of th blades :( BAD
SQUIRALBOY43 1 year ago
i am afraid of big props
Microice109 1 year ago
loses efficiency over a fixed pitch unit
eaxnitro 1 year ago
@eaxnitro
Why's that then?
sierraonezero 1 year ago
What would be the benefit of the controllable pitch over a fixed pitch prop adjusting shaft speed? Definately looks cool, but seems to me like just one more mechanism that can fail in the middle of the ocean.
v12tommy 1 year ago
@v12tommy If you have a constant speed engine (which is more efficient and simple to maintain and operate than a varible speed and/or reversible engine) then you need a variable pitch propeller.
Paraffinmeister 1 year ago 3
@v12tommy
biggest benefit will be that you have no minimum thrust. the FPP is run at the engine speed or with reduction gear. but it means that the engine needs a minimum rpm. for big engines this might be around 15-20 rpm.
the CPP can change the pitch by less than half a degree. that means you can have very very low thrust. and you are much faster with reversing.
for a FPP you have to stop the engine, move the camshaft, and start it again. takes more time.
have been on a ship with CPP.
gunman89 1 year ago
holy shit! big :D
TheMacGywer 1 year ago
One of those things fell off the U.S.S. Barbey, FF-1088, back about the mid 1980's. We had to take her place in a WESTPAC as ready duty destroyer because of that incident.
ReginaldWorthington 1 year ago
massive!
dealwithit00000 1 year ago
That should be "controllable" pitch propeller. Variable pitch indicates the pitch varying from the hub to the tip. Controllable means it can be controlled as in this video. Compare that to "fixed" pitch where the propeller has no movable parts. There is quite a difference (I'm not just picking nits)
paulkrupa 1 year ago 3
@paulkrupa .....well said paulkrupa
tatakiboy 1 year ago
That shortens your point to stop time! Changing direcions without stooping the machine!
Genius, why i could'nt get this idea? lol
BinoBanana 1 year ago
Thanks for the vid! appreciate!
Patoche129 2 years ago
wow, that makes our dry dock look like the bates motel! that place is nice!!!
Duckyistrippin 2 years ago
I Get it now !! That should be interesting to watch in action .
scyclonebeejr 2 years ago
WOOOW just amazing...it's functioning like the modern electro-windmills. They don't have to speed up/down the engine :)
313EDO 2 years ago
What am I looking at ?? Isn't it just a Propeller ?
scyclonebeejr 2 years ago
the propeller blades r twisting to change the pitch in turn changing the amount of water they push, its used to control boat speed and forward/reverse direction instead of changing the rpms on the engine
darknitues 2 years ago 3
Makes it easier to reverse since you don't have to stop change the cam in the engine and restart it to run it backwards.
FarmerGriff 2 years ago
dont you see them controlling each blade of the propeler on a 4 way axis?
Bamchucknorris 2 years ago
Not just any prop. thats just the beginning ;)
ericspinball 2 years ago
Well, if you think of it as a really, really, really big r/c...
LOL
fandingas 2 years ago
same lol
killerlad9 2 years ago
the thing is i thought this was going to be about rc planes!
cheeset6 3 years ago
ya me too
supertommy33 3 years ago
Me too, I was looking for the 4D VPP, that's what I got, just bigger than I expected...
NitroBlastSnorter 2 years ago
it wasnt gonna start spinning.. just what u saw. you change the pitch angle of the proppeller blades to affect the movement of your ship and the speed of the movement..
Dekkerhus 3 years ago
imagine swimming and you see that coming for you that would be so freaky
Nicdog829 3 years ago 31
@Nicdog829
*Jaws Music*
halo09100 1 month ago
not much "operation"
DrIdler00 3 years ago
omg soooo sloooo....... but gd
Dimitry999 3 years ago
...Was it supposed to start turning?
ragemanchoo82 3 years ago
That thing i HUGE!
JokeriPokeri16 3 years ago
I thought it was going to start spinning and cut up the little men.
adamwoodhouse 3 years ago 47
@adamwoodhouse
not a little man, the propeller is big...
molinobeer 1 year ago
@adamwoodhouse Large marine propellers do not rotate that fast, typically less than 200 rpm, and if you were standing in front of one of the blades when it began to turn you'd just be flipped out of the way.
bagelboi66 6 months ago