How do planes fly upside down?

WillyNelson said:
Plus the rotors of a Lynx are stiff enough to withstand the forces applied when it rolls. With most helicopters the linkage between the blade & the rotor head would collapse.
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Quite - It has some fancy fangled titanium hub that and withstand the massive forces involved - stunningly awesome chopper.
 
SteveOBHave said:
Helicopters don't actually fly upside down - not full scale ones anyway.
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Give it some rigid rotors and you can get pretty close to flying upside down. You have to be a complete nutter though, and be immune to ridiculous cockpit vibration, and not want to land anywhere with your rotors on, and not want a high top speed, and like replacing the hub system every week, and......

It's not practical, but damn it looks cool!

 
Justin said:
It's not 'all' about the AoA. Indeed AoA comes into it, though the aerofoil camber and also a lot of other factors do too, engine and structural limitations for example.
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I think he's suggesting your post implied symmetrical aerofoils were required.
 
RC helicopters can fly upside down:


I think they can change the blade angle to negative to achieve it.
 
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i fly helicopters, and yes, the blade pitch is collective and can usually be changed from 11 to -11 degrees, and usually works when the motor is ran at a constant rate (head hold mode) and then the throttle stick is used for controlling pitch :) (ie center throttle = no pitch, 100% throttle = +11 deg pitch, 0% throttle = -11 deg pitch)

it's an awesome hobby to get into :)


anyway onto planes, purely based on the aerofoil & how the flaps are designed (aile)
 
Addicted said:
i fly helicopters, and yes, the blade pitch is collective and can usually be changed from 11 to -11 degrees, and usually works when the motor is ran at a constant rate (head hold mode) and then the throttle stick is used for controlling pitch :) (ie center throttle = no pitch, 100% throttle = +11 deg pitch, 0% throttle = -11 deg pitch)

it's an awesome hobby to get into :)


anyway onto planes, purely based on the aerofoil & how the flaps are designed (aile)
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ah nice - I've always been keen to try flying a helo. My father was an airforce engineering officer so I grew up around this stuff and have done a little flying in fixed wing. My dads got a few planes and a heli (Rutan Long-EZ, Vari-EZ, Quickie and a Rotorway... possibly an Exec 162 but I can't be sure)

This is the Vari-EZ and you can see the wings to the Long-EZ along the wall.
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This is the Rotorway.
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Ka-50 Hokum/Black Shark and Ka-52 Alligator attack helicopters have operational ejection seats.

The french eurocopter Tiger had them too in the prototype but the Russians stole it in front of James Bond in Goldeneye so the production one doesn't have them anymore ;)
 
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