Ed,

I did some checking and I believe that the 5320/28 will work, even if used on 8S. My initial intent was to keep the peak current in the 45 amp range. With this in mind, on 8S, the motor will spin a 17x12 at about that current. The power might be a little modest at 1200 watts, but felt that it would be adequate. On 10S, the prop of choice would be a 16x10 and the power would be in the 1600 watt range with a current draw closer to 50 amps.

The 5S packs which I own are the 3200 mah NEU Energy packs which are relatively light. A 10S pack of these cells is no heavier than an 8S of the 3700 mah Rhinos. I made this assessments earlier this year before I realized that 3200 mah might not give me the duration I would like: this is based on a plane with a 45 amp peak draw and a 28 amp draw average. These packs allow for only a 6 minute flight.

I think that in the end, I will have to play with props and batteries to find out what works best. I do appreciate your advice since it is based on actual experience and it is a better indicator of what to expect than the Motocalc or P-calc.

Thanks,

Teo