#### dong090909

##### Well-Known Member

The conditions for the lift balance of the coaxial anti-propeller rigid double rotors are: the upper and lower rotors are in the same phase

Proof method:

Junior high school mathematics and physics: vector analysis of forces

2. Second conjecture (an extreme case of the first conjecture)

If the number of blades can be infinite , the lift balance of the upper and lower rotors can be achieved at every moment. a flying saucer

3. Background:

A. When I first saw the Sikorsky ABC rotor concept, I remembered: the differential compensation theory commonly used in electronics, I think its biggest benefit should be to reduce lift fluctuations.

B. I'm curious: why the great companies don't mention: Conditions for rotor lift balance. At least I can't search it. And it affect the direction in which humans resolve lift fluctuations

C. I estimate:

---Flexible rotor, it really doesn't make sense.

---The rigid rotor is subject to the influence of the few blades of the mainstream helicopter, which does not reflect the value (more blades, low flight efficiency)

D. I tried simple communication with aviation professionals on the mainland, at least they did not overturn my point of view.

E. Unfortunately: these two conjectures are an important aerodynamic basis for the aircraft I designed.

4. Therefore, I hope you can review my conjecture.

Thanks