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May 24, 2017, 02:56 AM
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H King motor change


The 11 year old ACN 16/15/4 was a direct replacement for the H King motor. The ACN has 2100kV, a 3.2mm shaft, & optional wider bolt spacing. It alone cost as much as the complete H King. 2100KV must have been right near the minimum for inrunners.

Opening the H King revealed a completely dry gear. The H King motor was the kind which can't be opened & rewound. The motor bolted into soft plastic without washers. The best gear alignment was pretty bad. The MEGA has wider bolt holes but there's not enough room to drill more plastic.


The downhill runaways were fixed by dramatically decreasing the PID gains & limiting the minimum throttle to a value which brakes less. The minimum should be set more precisely to a level that just turns the motor. Also, the ACN motor had much higher cogging which led to nihilistic braking.


On the 1st drive with this motor, it used 880mAh to go 4.5 miles at 9 min/mile. There was no payload & the LEDs were on. That's 195mAh per mile, slightly lower than the Ruckus. Driven to destruction, its 4Ah 8.4V battery would go 20 miles. It's tempting to install a headlight switch.


Based on the blog history https://www.rcgroups.com/forums/show...Ruckus-testing, the Ruckus had a 4Ah 8.4V but it only went 10 miles until destruction while carrying a shirt.


It's strange that when using the 4200KV motor, the H King burned through 800mAh per mile. It must have been right above stalling.
Last edited by Jack Crossfire; May 24, 2017 at 11:45 PM.
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