We want to use APM to control a glider which should be launched by a weather balloon and climb up to 30 km altitude. The problem is to achieve best gliding performance to return against strong headwinds of up to 400 km/h. The stronger the headwind the higher the airspeed for best glide. The headwind's speed at all altitudes is known from ascent.
Our question now is: Is it possible to set and autonomously change the target airspeed during flight (without radio connect of course) and therefore control the pitch down angle of a motorless glider?
As far as we understand APM, the whole system is based on the idea of a more or less constant airspeed which is controlled by the motor. A glider's "motor" is the pitch down angle. The relationship between airspeed and pitch is known so I guess we could as well try to control the pitch angle (which seems to be the same problem). We absolutely want to avoid having to develop our own control system for the target speed.
Does anyone have experience with this or have a solution?
Many thanks for your help