I have been measuring my Aviation Design F-100 (similar size to the BVM F-100) and putting the values into the spreadsheet. Once again I am very surprised at how little power the servos need. The ailerons, flaps and rudder could have used very ordinary servos, not the expensive and power hungry JR8511s that I fitted. The all moving tailplanes will have to wait for Oli's next article, I am looking forward to that. The screenshots below show aileron, flap, rudder in that order, with aileron and rudder calculated at 150mph, flap at max 100mph. As you can see the ailerons only need a servo of 1.4kgcm torque (approx 20ozin I think). Even at 200mph this only rises to 2.4kgcm ( 34ozin I think). The flaps have very little travel in this model hence the low torque required, but even if speed is set to 150mh to allow for forgetting to raise the flaps, the torque required still only peaks at 3.9kgcm ( 54ozin).
I am building the Mick Reeves Lightning next and had assumed I would be using servos like the JR8511 all round, but I will run the numbers through this spreadsheet before making any purchase.

Harry