4 ms·
Accelerometers are bound to detect such adverse effects. Correcting roll and pitch automatically shouldn't be hard. Also, I would guess that the higher the ma
by loup-vaillant 13y ago
Accelerometers are bound to detect such adverse effects. Correcting roll and pitch automatically shouldn't be hard. Also, I would guess that the higher the main rotor (compared to the centre of mass), the more susceptible the device. So, if you build the main rotor as close to possible as the centre of mass, you should have a more neutral design.
While we're at it, I've flown a little toy with two main rotors, rotating in opposite directions, controlling power and yaw, while the tail rotor controlled pitch (the whole thing was auto-stable, so there was no need for roll control). It worked like a charm. So, if we're willing to suffer the complexity of an actual swashplate[1], we could try a design with 2 main rotors, one above, and one below, hereby getting a neutral, manoeuvrable, and (hopefully) efficient design.
[1]: https://en.wikipedia.org/wiki/Swashplate_%28helicopter%29 https://en.wikipedia.org/wiki/Swashplate_%28helicopter%29
- CraigJPerry 13y agoAIUI there's all sorts of considerations & trade-offs. E.g. the motors have a limit to how quickly they can change output (up to around 400Hz today). Because there's no swashplate on the upper rotor of those wee co-axial rotor designs, they're really ineffective in cross wind. You can't apply the required corrective input when the top rotor gets blown off axis.
- loup-vaillant 13y agoThe design I was thinking about puts the lowest rotor below the gravity centre. First, it would lower the highest rotor, and second, crosswind would have the opposite effect on the low rotor. I really expect such a design to be neutral.