Since Plane determines wind direction most accurately while in loiter, maybe it’s a good idea to have a 2 orbit loiter command just after take off and just before landing to ensure best estimation of airspeed when no airspeed sensor is installed?
From the documentation "a synthetic airspeed estimate is calculated by the AHRS system by combining a wind estimate, the GPS ground speed and the response of the aircraft when turning. "
I’ve read in a post from a developed that a full 360 turn is best to allow for this calculation to be as accurate as possible.
I’ve also tested it myself a number of times - flying off straight from launch sometimes result in a wrong wind direction. Doing a full circle corrects this in terms of wind speed and direction very accurately.
I don’t use an airspeed sensor and have no problems at all. In Auto mode my cruise throttle is 50% and min throttle 35%. This allows for enough airspeed in a strong tail wind and minimises the risk of a stall in a turn or loiter.
I originally tried with an airspeed sensor but just found it difficult to calibrate and not very accurate.