Autodynamic rotor head
 

I will start soon the design of an autodynamic rotor head. Has anybody tried it in the past?

Norbert MOSSON

RE: Autodynamic rotor head
 

I'm not familiar with that term. It's probably just my own lack of knowledge but can you explain what it is or post a picture? I'm curious now!

RE: Autodynamic rotor head
 

Hello Norbert

Wow, you have a challenge there. Are you going to use delta 2 inclination on the lead lag hinges as Cierva did ? I don't have any images but I do have a short movie of the autodynamic in action.....I will try to dig it out .

What method are you going to use ?

Sean

RE: Autodynamic rotor head
 

The autodynamic head is the way of acheiving jump take off without any additional pitch variation. The way it works is very simple: When a torque is applied to the rotor, the blades rotates around their drag hinges in the opposite direction to the rotor rotation from 5° to 10°. If now you are using a drag hinge that is not perpendicular to the blade axis oriented in the way of having a blade pitch decrease when the blade moves downward, you are able to spin up your rotor at a speed that can exceed the flying speed without having any lift (ideally, the blade pitch would be the one of no lift during spin up). When you release the clutch, the blades takes their normal flying pitch by release of applied torque, and excess of speed converted into lift and the gyro can make its jump.

I will start by designing the driving system and the clutch, during the winter, and the complete autodynamic head in a second phase. If nobody tried this before, it will be just more difficult to experiment this...[&o]

Norbert

RE: Autodynamic rotor head
 

Ahhh, OK Norbert.....Thanks, I understand now!

RE: Autodynamic rotor head
 

Hello Norbert

I did see a design once for a simpler method of obtaining a jump take-off.

Essentialy each blade can rotate ( exactly like pitch change on a helicopter ) except that they are sprung to remain at flight rpm. Through the centre of the rotor shaft passes the driveshaft which ends with a spider that has ( for 3 bladed roter ) 3 legs. These legs when driven push against the spring tension holding the flight pitch rpm causing the pitch to reduce to 0. Soon as the drive is removed they snap back to flight rpm. If that doesnt make sense I will attempt to draw it .

Sean