Aviator168
Member
I don't know what the design is. Looks like as long as it is loaded, it will keep spinning doesn't matter up or down.
I think it is just an articulated rotor but on flapping. No blade advance and pitch compensation.
Watch the “Magic Rotor” on Youtube. Each blade is on a torsion bar with effective hinge near the leading edge. With load, each blade twists nose down.
The person presenting the video doesn’t understand autorotation and thinks he’s invented something.
If you the blades are link in pitch, when the advancing blade pitches down, the retreating blade pitches up, the blades don't need to be flapping any more. Mast bumping won't be an issue, right?
If you the blades are link in pitch, when the advancing blade pitches down, the retreating blade pitches up, the blades don't need to be flapping any more. Mast bumping won't be an issue, right?
The linkage is simple. Just allow the pitch to freely float and the two blades are hard linked together so if the pitch of goes up, the other much go down. I have not figured out how to set the pitch during flight; but a preset pitch is possible.I'm not sure if a rotorhead with such a linkage does actually exist. Something like that was invented in the 1930s, I think... A 4-bladed rotor with each pair of opposed blades linked in pitch... A variation of the 'floating hub'...
But I'm not sure. It's just a fuzzy memory...
Wow. I was not expecting that drag is a lot higher at 0 AoA.Doug,
Calculated comparison with usual pitch setting of 3 degrees and with 0 degrees (Rotor 7 m x 0.18 m, NACA0012, Forward speed 90 km/h, Lift 2500N)
With the pitch setting of 3 degrees: Rotor drag 473N and 400 rpm
With the pitch setting of 0 degree : Rotor drag 786N and 521 rpm