dtb850, efficiency, power test, Torque Effect, twinComments Off on A test to see if two motors will run on one large ESC 2.2 Kgs of static thrust @ 35 Amps both motors in parallel
A test to see if two motors will run on one ESC 2.2 Kgs of static thrust at 35 Amps both motors in parallel. Speed control was good
Results 2.2 Kgs of static thrust @ 35 Amps both motors in parallel 387 Watts total on a Turnigy 2200mAh 3C
Efficiency @ 387 Watts Thrust/Power = 5.75 Grams/Watt A single 850 delivered 1.4 Kgs for 22.4 Amps 235 Watts swinging a 11 X 4.7 on a 3C Thrust/Power = 6 Grams/Watt You would expect better efficiency as the static losses double in a twin installation. That said at 1.4 Kgs the efficiency is 6.7 Grams/Watt for the twin @ 17.9 A vs 6 Grams/Watt for the single motor, almost 12% better @ 22.4 A and again at 1Kg the twin is 7.66 Grams/Watt @ 10.2 A vs 7.07 Grams/Watt for the single 8.3% better @ 11.6A Twin D4023-850's driving 10 X 4.7 Slow fliers on a single Hobbyking SS Series 90-100A ESC all up weight motors, props, ESC including rig 322 Grams The Setup Hobbyking SS Series 90-100A ESC Weight: 85g Size: 70x50x13mm Cells: 2-7S Li Po Max Current: 90A [over 70A use 6S only] Burst : 100A No BEC Timing: 1/7/15/30 programmable PWM: 8/16K Two D4023-850 Out Runner Motor Rpm/V: 850kv Max Watts: 380W Max Amps: 35A Max Volt: 7.4~14.8v (2~4S) Idle Current: 1.5A Resistance: 0.039 ohms Weight: 107.1g
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