Vertical compliance shouldn’t be necessary so long as the rotor is properly tracked.
Mast flexibility along with the greatest possible lead lag stiffness of the rotor should keep inplane resonance of the rotor/mast assembly above the excitation frequency. A slider does about the same thing as mast compliance except that it only works in a fore/aft direction.
I don’t have precise answers but a friend of mine had a gyro with a “redundant” mast; two pieces of 1” x 2” aluminum tube structurally bonded together. That thing shook no matter what blades were being used.
My gyro with 2-½ inch round 2024 x 0.120-wall tube was dead smooth. The same blades on Bob’s gyro rode like a jackhammer; we even swapped rotorheads to no avail.
Mast flexibility along with the greatest possible lead lag stiffness of the rotor should keep inplane resonance of the rotor/mast assembly above the excitation frequency. A slider does about the same thing as mast compliance except that it only works in a fore/aft direction.
I don’t have precise answers but a friend of mine had a gyro with a “redundant” mast; two pieces of 1” x 2” aluminum tube structurally bonded together. That thing shook no matter what blades were being used.
My gyro with 2-½ inch round 2024 x 0.120-wall tube was dead smooth. The same blades on Bob’s gyro rode like a jackhammer; we even swapped rotorheads to no avail.