I've read through as many helicopter-autopilot discussions here as I could find. I'm trying to quantify what the issues are with going from a fixed wing autopilot to a helicopter autopilot. What I've been able to gather, is that vibration seems to top the list. There also seems to be an issue with the number of controller channels - at least with the ArduPilot. Are there other ones to be worried about?
Thanks...
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Heading - need magnetometer
Barometric sensors may not work in the rotor downwash
Pitot tubes won't work in the rotor down wash
Ultrasound sensors for height above ground may not work due to vibrations
even short GPS errors/outages and/or other short IMU errors need to be dealt with cleverly, where a fixed wing will stay up for a while and can recover when new GPS/IMU data comes in a helicopter will quickly be in a state from which it can't recover.