Hi ya'll,
We seem to be getting some excellent info recorded!
Dickybird with a version of what I find to work well, good show!
Tintex with a new approach that makes sense.
We have used sandpaper to keep props from loosening so why not rotor blades?
The basic subject was flutter and it seems appropreate to look into that further.
There is an old axiom which we should consider. "when there is a problem determine the character and then the cause" Don't believe we have considered that as yet.
Another word for flutter would be flexing which would suggest the item is vibrating, moving both ways from it's normal setting.
Would seem causes of flutter could be sympathetic vibration and/or aerodynamic.
An example of vibration.would be Loyal Balyes and the Gee Bee. He pushed the engine above it's upper limit to establish a record. The engine did not like that and vibrated causing a wing panel to flutter and fail.
More common would be aerodynamic and control surfaces for instance.
A common sight is a flag waving (fluttering?) How come it does that? A flag is anchored solidly to the pole leaving passing air to effect what is not anchored.
In contrast if a control surface is hinged at the forward edge and that is all then passing air will effect it as with the flag. Such doings may work fine up to a given air speed. The air force increases as a square of the speed? Then as speed is increases flutter raises it's head.
Control surfaces are properly attached considering two factors.
Hinging>
First at the center of the surface's control force, that is where the force centers when the surface is producung work. (C/L perhaps?)
Secondly, when the first has been done then the surface is balanced about that hinge point,
Good part is when done that way the strength of the surface only has to relate to the force it will create.
It would appear that gyro people have traditionally outfoxed flutter by simply using structure to resist (offset?) any flutter forces. Obviously that has been a useable solution.
However, another consideration has recently raised it's head.
We have seen superior.excellent performance from a rotor
weighing half of the normal. The blades are obviously light ,are not robust but have sufficent strength.
This would appear to offer flutter ability?
No signs of flutter have been seen, how come possability?
The blades are attached to the hanger with one steel screw and
a second plastic screw.
The screws are on the center line of the hanger hinge.
The blades are attached along the airfoils center of lift.
The blades also balance at the attachment point.
Aerodynamically such attachment makes sense?
There is an old adage which says"Lighter flys better"
Reasoning is> weight requires power to move and lift to raise.
A lighter rotor feeds into such reasoning?
Another boring episode? Would hope not!
Good luck.

Hal [email protected]