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Archive for the ‘twin’ Category

Gen
05

Yellow boat 4 revised powertrain surface props and single rudder

heli motor, surface props, Turnigy, twin Commenti disabilitati su Yellow boat 4 revised powertrain surface props and single rudder 













Nov
27

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

dtb850, efficiency, power test, Torque Effect, twin Commenti disabilitati su 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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