what's it called?
 

Over my course of training, it seems like almost everytime I rolled down the runway for take off, gradually gaining airspeed and rotor rpm, then all of a sudden the gyro hits an invisible "wall". A momentary "obsticle". This phenom was explained to me somewhat, but I can't remember. It kinda feels like what a strong downdraft might feel like, but no. The gyro quickly passses thru it, yet this always seems to occur. You give it a second and it goe's away. What's this called, and why does it happen? Would someone please explain? Thank you. MJD.

That's when the rotor becomes an "effective disc", and at max back stick becomes an air brake until it is tilted foward to become a lifting surface.



Tony

Uhhhhh!
 

And you received your training WHERE ? :confused:

Martin,

Can you be more specific? Does the "wall" occur while still on the ground (takeoff roll)? Or after you break ground?

And when the gyro passes through it, is it because you did something different with the controls to make it "go through it"?

More info will help all of us analyze the situation.

Tom

P. S. Don't mind Steve, he's ornery.

I was about to ask the same queestion!:tape:

Tony nailed it. Vance Breeze calls it "feeling the rotor start to bite."
Your rotor disc is at a high AoA and gaining rotational speed and reaches the point of developing significant lift. A strong componant of that lift is directed rearward acting like a huge amount of drag. The rotor thrust vector is well forward an will lift the nose of the gyro increasing the disc AoA and further increasing the rotor RPM. It can feel like you just bogged down in deep mud. Unless considerable power is added and / or the nose (AoA) lowered, it will slow you down dramaticaly.
That's the basic mechanics of it, your instructor should explain and demonstrate the best technique to safely use this "phenomenon" for shortest take off without "crowbaring" off on the tail wheel.
:yo:

staying in school...
 

Hey guys I feel like the wind just "blew my skirt up"! Embarresed!

Rotor Tom, I'm still on the runway when I sense "the bite".

Thanks for the explae Tony, nose goes up, forward on the stick, balance on the mains, add more power, more power. Nose wants to rise again, more forward stick, go to full power. I'm flying the aircraft.

Pete, thanks for the post. I like an explanation in detail. It's at a moment that I am kinda busy and don't want to bother to pull over and ask the instructor "just what the helly was that"? This has been explained to me, just never imprinted.

Steve, answer: Macon, Geee-orgia! Just teasing, I had a lot of fun learning from you, and you are a very good instructor and a great guy. (You made me laugh a lot.)

Anyone else want to add? All appreciated.

MJ Daly

"Period of reversed control".... at a certain speed pulling back on the stick will only slow you down so you push forward to gain speed for lift off. But th.at's just how I think of it......non technical answer

It sounds like atittude problem . . .reaching max climb and loosing fwd speed, kinda hovering!
Heron (way too far from been an expert)