Flaps are an interesting problem for a model. In the full-size the plane has flap limiting speeds and the pilot has an ASI. A model should always be slowed down before applying flap, but the airspeed will be inconsistent without an ASI and you can't be sure at what slower speed each individual pilot will choose to lower the flap. Even then, we don't actually know what airspeed the model is doing with each individual pilot. Therefore do you pick a speed for the calculation that has a massive safety margin, such as the expected top speed in level flight, say 150mph? The result of that - a combination of a flap's large chord, huge deflection that is typical of flaps, and high airspeed is likely to produce a very high torque demand. The effect of airspeed is dramatic, so if you can be sure that you will slow down to some arbitrarily chosen speed say below 100mph, the torque demand will fall substantially. Calculations will become a good deal more accurate once we have the GPS module giving ground speed, it will allow us to come close to the actual airspeed instead of the guessing that mostly happens at the moment.
H