No, as you have now released clamps, forces can now equal out again and so blades turn.
What Myth would you want to see busted?
- Thread starter Linkex
- Start date
No, as you have now released clamps, forces can now equal out again and so blades turn.
![[FnG]magnolia](/styles/overclockers/avatars/9.png){kind=avatar}
Caporegime
- Joined
- 29 Aug 2007
- Posts
- 28,767
- Location
- Auckland
Thank you.
Don't even need that. Increase the viscosity by using water. Then rotate a massive blade whilst spinning in the wrong direction and see if there is any thrust reducing weight.
Wrong.
The engine IS turning the blades RELATIVE to the engine. The force acting against the engine is the same, it is the friction of the transmission.
Soldato
- Joined
- 7 Jul 2009
- Posts
- 16,234
- Location
- Newcastle/Aberdeen
HELICOPTERS DO NOT WORK THAT WAY!
So what was this blade turning force doing while the blades were clamped? On holiday in Blackpool?
Yeh but the engine is now capable of spinning the blades faster than before.
Only when the friction of the transmission is equal to the force of the turntable are they balanced. That is likely to be at extremely high speeds, no?
Yes, but that is reality what people are asking. You can exert a constant force on the blade and then call it a helicopter rather than spinning the blade according to a predetermined speed.
No ts not.
You agree pistons are still moving up and down, so that energy needs an equal and opposite force. Thus blades turn.
The power is transferred from pistons to crankshaft, to the blades, pistons are moving, cranspkshafts moving, blades turn.
Again this is same as the wheel on the plane.
Turntable = conveyor belt
Helicopter body = planes wheel
Crankshaft bearings = wheels bearings
Blades = well there isn't a direct comparison.
The blades are turning relative to the engine at X rpm. The engine/heli is being turned, relative to the environment, at X rpm in the opposite direction.
The net result is that the blades are stationary relative to the environment, spinning at X rpm relative to the engine/heli and the engine/heli is spinning at X rpm relative to the environnment.
Assuming fixed speeds.
The net result is that the blades are stationary relative to the environment, spinning at X rpm relative to the engine/heli and the engine/heli is spinning at X rpm relative to the environnment.
Assuming fixed speeds.
I don't think anything works that way, if thrust could reduce weight then someone should wake me up from my dream.
Transferring the force t the clamps, which of course can't rotate. Same reason why the turntable base doesn't rotate.
Well weight is a force. Net forces can vary.
Soldato
- Joined
- 15 Feb 2011
- Posts
- 10,234
- Location
- Slough
if you clamp the blades when the engine is mounted directly to the blades with a straight shaft the helicopter will rotate.
now, lets try our experiment with the engine mounted to the floor and the driveshaft going parallel to the floor. to connect to the helicopter blades you will need a connection between the horizontal driveshaft and the vertical blade connector shaft. the engine powers up and tries to rotate. the blades cannot move because they are clamped. the engine cannot rotate because it is connected to the floor of the helicopter, so, where can the energy go?
the only option is to spin the driveshaft, which pulls the entire helicopter around the cog that makes the 90 degree bend between the blades and the engine.
ah, i hear you say glacius, but what if this connection was welded up so it couldnt move, surely the engine would try to rotate the entire helicopter around the engines axis? well, it wouldnt happen because that would mean the helicopter would try to rotate about its tail beam. when it does that it is attempting to spin the engine, which is mounted to the rest of the helicopter body, while not rotating the blade mechanism. however, if the helicopter body rotates about the tail beam the blades do as well. with this logic applied back to the not welded 90 degree cog system the only way the helicopter could turn with an engine mounted parallel to the floor is the opposite way to the blades
this is true for pretty much any sort of connection between an engine and the helicopter blades because at some point you need a connection that is perpendicular to the blades
It's not the same.
YES the blades turn. RELATIVE to the engine.
Can you answer my earlier question? Take the blades away. You have a standard car engine with it's crankshaft pointing up centered on a turntable. The engine runs at 1000rpm. Spin the turntable in the opposite direction at 1000rpm, what is the rpm of the crankshaft relative to the ground?
Someone needs to get an appropriate speed motor and put it on top of some vinyl decks and video it
No as there is no 'free' spinning element in the helicopter scenario.
The plane doesn't cancel as the wheels spin twice as fast, what in the helicopter scenario do you believe would rotate twice as fast?