Guys,

I have an old hanger queen Stuka that I'd like to convert to E-power. This ship is around 40" span and with a 26 -4 stroke weighed in at 36oz dry. It flys well with a 9x6 to 10x5 prop. I'd like to get a power package in around 11oz. Looking at the available motors I think the new AXI 2814/16 @ 1035Kv, 3.7oz, coupled with a 4s1p 2100 mah pack about 7oz, would meet the weight mark. Question, is the 2814/16 a good motor for this size ship and will it make the 5 min, 20 sec flight time with the 2100 mahs?

Best,               DennisT

Well that's the battery I use in both my Vector and Nobler planes. I would think it would be ok for your plane.

I might go to a slightly lower kV (900 range if you can find one) to better match the 4s pack. Also I would consider the APC TE 11x5.5" prop.

What rpm are you thinking of running? that sort of sets the rpm (and the kV of the motor).

If you plan to stay with a 10" prop, then to be safe, I would stick with the kV=1035rpm/V. That should give you plenty of headway to select rpm.

With my Nobler, the lowest voltage from the 4s2100mAHr pack during a flight was 13.8V, during the overhead 8 maneuver. So with a kV of 1000 rpm/V, that would translate to an unloaded rpm of 13800. With a 10" prop, I am guessing you may need 10krpm to keep the tension ok at that stage, and 10k/13.8k is 72%, so I think you will be fine--especially if you need less rpm (and I have already derated the pack from the average 14.8V that most of us use in the "70%" rule.

If there is an issue, the 11" prop would need less rpm (assuming nominal pitch is about the same), so you could always rely on that.