Dump'r - 2003/10

Dump’r is a relatively simple device that
safely discharges four- to 18-cell
Nickel Cadmium (Ni-Cd) and Nickel
Metal Hydride (NiMH) batteries at a fixed
1⁄2-amp rate. Discharge is initiated with the
push of a button and automatically
terminates when the pack reaches the
equivalent of .9 volt per cell. Dump’r
requires no external power and, other than
setting the “cell count” switch, needs no
adjustment or calibration

RADIO CONTROL ELECTRICS - 2005/03

THIS COLUMN INCLUDES a review of ESC motor (voltage)
cutoff and some discussion of the Goldberg Tiger ARF.
Based on reader mail, it’s clear that there is some misunderstanding
about the motor (voltage)-cutoff function found in most contemporary
ESCs. Following is some background and present-day info on the
subject.
In the earliest days of electric power, little was thought of—and
much less done about—controlling motor power in flight. Roughly 30
years ago, many E-fliers just turned on a manual motor switch,
launched, and flew until the Ni-Cd pack ran dry.

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