Ok. So I got some questions. I am running Tmotor 2814-11s, FF motor control set, with WKM and 4s. I want to upgrade my motors to carry a 5D/D800 comfortably withOUT having to upgrade the power system simultaneously. The battery upgrades will be more than the motors. From the forums, an email with Jim at monto and a few hours in Ecalc it doesn't look like that is a very attainable goal. It doesn't look like there are motors that will run 4s and 6s very well when give similar inputs in ecalc. Does anyone have experience upgrading to a heavy or heavier lift motor such as Tmotor MN4014-9 or MT3515 and staying on 4s, then later upgrading the power system? TMotor tech specs show lipo ranges of 3/4s to 8s but the numbers don't work in Ecalc. And this brings me to a larger question of backup helicopters. Are folks who have say 1 HL (6s) multi, also traveling with a backup that maybe runs on 4s? It seems like many people might be in this scenario but the amount of Lipos to travel with would be daunting. Are people just not traveling with backups often? I know some clients may that I travel with backups! Thanks!