RE: How do I size my rec battery ( 7 servo's)?
Let's be more precise, all.
The above consumption should be 15 mAh per 1 minutes flying (instead of 15 mA per minute).
In real life that means current of 900 mA = 0.9 A (15 mA * 60 min = 15 mAh).
I have measured 120 - 160 mAh energy comsumption during 10-15 minutes flying of 2 meter pattern plane with 6 servos (analog). Since I went to digital servos I have used Lithium battery which I monitor using voltage, not mAh:s .
So, I would suggest using ESV, of course, but also a computer controlled field charger. 1100 mAh will be enough for couple of flights. After that charge and check how much was consumed during those flights. Or better yet, dicharge the pack and see how much was still available.
Just my two cents,
ini