"JS" wrote in message ...
Measured with a cad-program, for a turn radius of 30 m, the thread angle
should be 3.6 degrees, if the distance of the thread from cg is 2 m. Tighter
turn, wider angle. How precisely you can keep your thread in a 3-4 degree
angle?

js

Hello JS -You must be flying a hang glider to be capable of turning a 30 meter radius while thermalling. For a given bank angle, the theoretical turn radius is proportional to the square of the flight velocity. Right?
My unballasted Ventus requires about 48 kts of airspeed when
performing a 45 degree banked thermalling turn. Under those conditions
I calculate my turn radius to be about 204 ft, or 62 meters.
Dick Johnson