Here's some motor calc's to get you thinking about this a bit more. I selected these motors using these criteria:
- Keep prop speed below 6500 for low noise (cell count)
- Static current selected so that peak efficiency current is at 1/3 throttle
- Pack capacity selected for duration = ~10 minutes at 2/3 throttle
- Only consider 10 to 12 S packs
It's hard to beat the A60 18L on 12S . . .