# Tag Info

Accepted

### Why are most multirotors built with an even number of rotors?

Yaw authority and ease of mixing is generally the answer - since yaw response isn't necessarily the most linear, being able to have N number of motors contribute to yaw in one direction with the same ...
• 846
Accepted

### How to calculate how much lift to be generated for my helicopter to takeoff?

Using the equations from this question $$L = C_l \cdot A \cdot 0.5 \cdot r \cdot V^2$$ Where: $L$ is lift force $C_l$ is the lift coefficient $A$ is the blade area (0.04 square meters) $r$ is the air ...
• 7,418

### Proper rotor fastening (Nyloc nut)

@JacobB's answer that you just need to tighten the nut more is correct, but I just want to explain why it (feels like it) is stuck when it is flush with the top of the motor shaft. Nyloc nuts, or ...
• 2,654
Accepted

### Proper rotor fastening (Nyloc nut)

I've had the same thing happen when using these same motors and props (and others). The propeller seems to get stuck at a point where it is not flush with the motor. From my experience, the solution ...
• 5,792
THERE IS A BIT OF MISUNDERSTANDING HERE, THE LIFT EQUATION CANNOT BE DIRECTLY USED FOR HELICOPTERS The correct equation for rotary-wing is: $T = ½ \rho (\omega R)^2 \pi R^2 C_T$ where $\omega$ is the ...