Airplane & the conveyer belt

[Gawdzilla Sama]

...on the treadmills?

[HappySkeptic]

well, on the sides, under where the wing goes. Or perhaps they retract when the plane goes by.

[Gawdzilla Sama]

The tread mill is just a red herring. Can an airplane get into the air without wind blowing? No.

[Anomalocaris]

The tread mill is just a red herring. Can an airplane get into the air without wind blowing? No.

some can.   they depend on direct engine thrust to create lift with tilting nozzle engines such as does the harrier, others uses dedicated downward pointing lift engines such as the Russian yak-38, and a number of Others pivots while engines downwards to generate lift, such as the Osprey, and a number of other VTOL concepts.

Short of lifting using engine thrust, there are also designs that uses engines to help the wing generate lift without forward motion.   Some blow exhaust closely over top surface of the wing, and also uses the exhaust stream to entrain andditional ambient air to create a sheet of high velocity air over the wing to create lift, such as the YF-15.  Others bleed air from the engine through ducts to blow over top of the airfoil to reduce stall speed.

[Fake Messiah]

I guess another way to experiment this would be to get a rubber band airplane, wind its propeller and just let it go. But I remember that I always had to throw it, I think it would not fly without the throw.

[Anomalocaris]

I guess another way to experiment this would be to get a rubber band airplane, wind its propeller and just let it go. But I remember that I always had to throw it, I think it would not fly without the throw.

The minimum forward speed at which airflow over an airplane’s can generate enough lift to keep the plane airborne is called stall speed. 

when you let go of a rubber band plane without giving it a throw, it starts to fall downwards under gravity while also accelerate forward under the power of rubber band.   the question is will the plane hit the ground before the rubber band accelerate the plane above stall speed.

i guess typical rubber band is not powerful enough to win the race if you drop the plane from man height.   you can give rubber band a better chance by dropping the rubber band plane from a high balcony,   or use a stronger rubber band.

[BrianSoddingBoru4]

We've certainly come a long way from that fateful day in 1903 when Wilbur and Orville Wright, using only bits of canvas and some old bicycle parts, invented the first in-flight meal.

Boru

[Anomalocaris]

We've certainly come a long way from that fateful day in 1903 when Wilbur and Orville Wright, using only bits of canvas and some old bicycle parts, invented the first in-flight meal.

Boru

their place amongst the pioneers of human flight is gravely threatened by their failure to also invent the tiny, nearly unsurvivable airline toilet.

[Gawdzilla Sama]

The tread mill is just a red herring. Can an airplane get into the air without wind blowing? No.

some can.   they depend on direct engine thrust to create lift with tilting nozzle engines such as does the harrier, others uses dedicated downward pointing lift engines such as the Russian yak-38, and a number of Others pivots while engines downwards to generate lift, such as the Osprey, and a number of other VTOL concepts.

Short of lifting using engine thrust, there are also designs that uses engines to help the wing generate lift without forward motion.   Some blow exhaust closely over top surface of the wing, and also uses the exhaust stream to entrain andditional ambient air to create a sheet of high velocity air over the wing to create lift, such as the YF-15.  Others bleed air from the engine through ducts to blow over top of the airfoil to reduce stall speed.

I thought VTOL planes would be an obvious exception, so I ignored them. I've been on ships carrying Harriers.

[Anomalocaris]

on most aircraft driven by propellers mounted in the leading edge of the wing,   the additional lift created by pro wash contributes a significant amount to the total lift generated by the wing resulting from forward motion.    

Currently there are a number of electric UAV concepts which magnify this effect by mounting continuous row of of propellers over the entire leading edge of the wing.   In some of these designs the lift created by prop wash over wing along is enough to lift the UAV off ground.