Ideas on power choice
Motorcalc is an indicator, not an absolute predicter. Consensus is that it rarely hits the nail on the head. Take a look at the GWS EPS-400 series motors. By all means, go with 7.2 volts if possible. This will reduce amperage needs. The Dare cub should easily fly on a 7.2V 400 motor with either 8 cell nimhs or 2S1P li-polys. The nimhs should give you 6-8min flight time. The li-polys would allow double or triple that depending on whether you use Kokams or Etecs, and the MAH chosen. Incidentally, the amps pulled in actual flight conditions is usally around 2/3rds static measurements
JT