Excel sheet calculates necessary circling radius as a funtion of the min. speed, reserve speed for gusts and bank angle.
Note 1: speed reserves for gusts may be adapted for gust level, for AGL and according aircraft behaviour
Note 2: The analysis is based on a simplified calculation model. The results are not accurate at very low speeds, large span and small circle radius due to the uneven distribution of lift over the span. The speed for the inner wing is given as an indication.
Lift distribution 1comet (preliminary design) according to AVL for 165 kg, circling radius 25 m, 45 deg. bank
(Note : AVL lift distribution is not considered in simplified calculation model above, but AVL results are not in contradiction to above calculations and flight measurements you see the inner wing is flying at a very high cl.