how blade rocks???

bshamblin

Member
Joined
Nov 20, 2004
Messages
35
Location
morganton nc
flyers,

exactly how and in which direction does the rotor blade ( 2blade ) system rock back and forth to adjust/equalize lift??? will the blades move horizontally ,( slightly back when advancing , decreasing the angle of attack,) and forward ( backward to direction of flight) when retreating (therefore increasing aoa ) ??? does that make the "loose" bearing need to be the one at the very top of the rotor bar???

thanks,

muchtolearninnc
 
Rather than trying to explain your question by typing the answer (I'm a very slow typist), I will give you a few great references to find this and many other questions.

First, if you want to learn the basics about gyros, you must invest in (or download) the Rotorcraft Flying Handbook (FAA-H-8083-21) put out by the FAA. Chapters 15-21 are devoted to gyroplanes specifically.

Also, try a Google search by typing "dissymmetry of lift". It will give you more links to your question than you have time to read.

Scott
Gyroplane CFI
 
Bill,
You can purchase the handbook (it is well printed with color illustrations) or download it for free at:
av-info.faa.gov/data/traininghandbook/faa-h-8083-21.pdf
Heather
 
Thanks for the info, I already have one but the downloaded material will save me time on translation to portuguese.
Good going
Heron
 
The Rotorcraft Flying Handbook is one great source of information.
One question to those whose English is better than mine: I usually stumble over the text at the bottom of page 2-3: "Angle of attack should not be confused with pitch angle. Pitch angle is determined by the direction of the relative wind ...".
I thought, pitch angle was determined by the axis of rotation and angle of attack by the relative wind.
Can anyone explain, please, where I make the mistake?

Peter
 
Peter: You are right. The book is wrong.

Angle of attack (AOA) is the angle at which the air actually meets the airfoil. It is measured relative to the airfoil's chord line. You can't see angle of attack directly, because air is invisible.

Pitch, on the other hand, is a mechanical measurement. It is the angle between the airfoil's chord line and a plane (or disk) that is perpendicular to the axis of rotation.

Pitch in a rotorcraft blade is comparable to incidence in a fixed wing.
 
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