Hi ya'll,
There has been some technical talk on this spot so thought
the following might be of interest and you might have a reply
that would be most welcome.
It is said " The air flows down through a coptor rotor and up
through an autogyro rotor" The heli portion is obvious with the
rotor being much like a propeller. however the Gyro portion seems
to defy common sense. Lets look at the factors envolved.
Would believe rotor blades are rotating wings?
Wings develope lift and as Gyro arranged also forward motion?
A wing is an airfoil and for a foil to develope lift the airstream
must pass it chordwise.
Airstream is the air which an aircraft passes through. the air
streams by. The craft is moving, not the air.
Thus the airstream is paralell to the line of flight.
The airstream passes the rotor in the same manner as it does
the wing of an airplane.
Can assume the blade airfoils see a chordwise airstream?
Thus the blade airfoils develope lift and forward motion
The sum of all blade lift equates to disc and rotor lift?

Bottom line would appear to be that an airfoil could not work if
the airstream was at a vertical angle to it Flowed upwards.

A rotor developes lift because the upper blade airfoil side is at
a low pressure and the lower side is at a high pressure.
The lower side seeing high pressure suggests the blades are
pushing air downwards, displacing it. Displaced areas are filled
with air from an opposite direction. It could be assumed that some
amount of air thus flows down through the rotor?

Any thoughts on the above? Would be nice to have any thing
explained in plain English, OK?

Hal deBolt [email protected]