I had a big day at the field today, I surpassed the 200 flight mark on the yellow camo Mig-35 below, so both planes in this picture are in the "200+ flight club" :). I wrote an article about my experiences and impressions of the long term durability of Foam Cure glue using the yellow plane as reference, you can read about that here.
However, I thought, what the heck, one never knows until one tries. So I set up a test to fly with my wattmeter in my plane. Not the prettiest looking test setup, but it worked.
I will admit that my limited knowledge of how electric motors work was learned back in high school and much of that knowledge is long lost in the sands of time. My learning curve on how brushless RC motors and their associated props, ESCs and batteries all work together is also quite steep, but I am always striving to learn and understand how things work so that I can understand and recommend the best possible prop/motor/ESC/battery combos for best power and long life of the components.
- Grayson Hobby SMJV2 2550 Kv motor with a 6x4 APC prop. I know this motor is not on our recommended parts list, but I tested this plane awhile back with it and it flies well. At $35 before shipping, I thought I might as well get some use out of it also and save some wear and tear on my other motors;
- Turnigy Plush 40A ESC;
- Zippy Flightmax 2200 3S 40C discharge battery.
The wattmeter is pretty heavy at 105 gr/3.7 oz, so my flying weight was about 25 oz.
I don't have telemetry in my plane, so hence the rather crude test setup, but I knew the wattmeter would display peak amps and watts during the time it was connected to my power system which is what I was looking for to see if there was an increase while flying compared to static testing on the ground.
I tested the plane on the ground and at 100% throttle held for five seconds saw peak Amps and Watts of 30A and 355W. While in the air, I did several five second bursts of full throttle while level both into and with the wind and several pure vertical climbs holding full throttle for five seconds. When I landed, the peak amps and watts had not changed, so in this test anyway, flying amp draw was less than static amp draw.
So very interesting testing and always nice to see numbers to back things up :).