This entry explains clearly how poor understanding is resulting in incorrect arrangement of propellers, causing serous VTOL Flight safety issues, and shows the solution to the problem.

I am going to discuss V–22 Osprey aircraft as the most prominent case pertaining to the issues above.

Overall V–22 Osprey is an outstanding engineering achievement, given the humble means, the rotating propeller, it is using to achieve performance goals for the craft.

However, right from design phase, the craft was plagued by Flight instability problems.

Only the strong / irreplaceable need for such a craft, took it from design phase to production.

Despite long history of luck of flight robustness, no fundamental flaw in the deign of the craft was recognized / learned, thus no critical change was made to the initial design of the craft.

Below is description of what is that fundamental fault with V- 22 Osprey and how to fix it.

During reading refer to attached image RD-V-22 Osprey. Significant portion of air, between rotors jumps from one rotor to the other. Given enough time, these oscillations of air flux can amplify to Unacceptable levels, resulting Lift Force imbalance, with catastrophic consequences. This is exactly what happens with V-22-Osprey during Landing and Take Off phase.

Correct solution of the problem is to tilt the rotors to a some angle φ relative to each other, as is shown in the accompanied image RD-V-22 Osprey. This will result:

1. Increased distance between the tips of adjacent rotors and
2. Changing direction of air flux, entering the rotors. Thus making it harder for the air flux to jump from one rotor to the other.

This will completely remove Oscillating Air Flux Phenomena - OAFPH.

Knowledge of Flux oscillation phenomena between two rotors described above, goes beyond implementation in design of VTOL aircraft of V-22 type.

Electric VTOL aircraft with multiple rotors, is the most dynamic development in today’s Aviation Industry and that knowledge will be very helpful to the technology, to design safe and efficient aircrafts.

I believe:

1. Tilt angle φ about 30 degrees will be optimal and adequate.
2. It is not easy, neither too difficult to make an air craft with tilted rotors.
3. It is a must, mandatory for safety and robust flight.
   Objection that tilting the rotors, decreases uplift force has little foundation. It must be done for safety and flight robustness.
   Beside, once competing phenomena disappears, supply of air to the rotors improves, thus compensating the loss of uplift force.