As the rotor turns.

All_In

Gold Supporter
Joined
Apr 21, 2008
Messages
16,105
Location
San Diego, CA. USA
Aircraft
Airgyro AG915 Centurian, Aviomania G1sb
Total Flight Time
Gyroplane 70Hrs, not sure over 10,000+ logged FW, 260+ ultralights, sailplane, hang-gliders
Bad example , John. Because it is a bolkov 105 rotor, with 4 blades without drag hinge or flapping hinge (Doman's rotor?)
 
Bad example , John. Because it is a bolkov 105 rotor, with 4 blades without drag hinge or flapping hinge (Doman's rotor?)

No... The Doman rotor is a floating-hub rotor. It's also hingeless, but there's a difference. The Doman rotor aligns itself so that the axis perpendicular to the tip-path plane is always parallel to the rotor axle, that rests on a spherical bearing. In the hingeless rotor of the BO-105, the axis perpendicular to the tip path is not parallel to the rotor axle, so the blowback is achieved by blade-root flexing, and not with a physical hinge...
 
If the CG of the rotorcraft was not offset from rotor center, there would never be need of flap/drag hinges.

The BO-105 minimizes offset by locating the heavy stuff; – Engines and gearboxes above the cabin roof.
 
You're right, the Bolkov rotor is not Doman's systèm He is rigid. Flapping and lead lag are entrusted to the only flexibility of the blades.
Even without offset of the CG, there remains the flapping due to the flight forward ie about 2 degrees
 
I found the movement different and wondered why. You guys Rock!
 
Top