A recent injury that occurred at the field highlights the need to observe specific safety precautions when flying electrics.  The flyer was attempting to disconnect the motor battery when he accidently bumped the throttle stick on the transmitter.  The motor started and the prop cut his hand and arm. This necessitated a trip to the ER and 12 stitches.  Fortunately, the flyer has recovered from the injury. Recommended safety precautions follow.

1.    Airplane and Transmitter Positioning on Bench.

After the model is assembled for flight, and before connecting (or disconnecting) the battery, place the transmitter well out of reach with the throttle fully off.  Tie the airplane down, use the vertical bench holdbacks, or have someone else hold it.   When the motor battery is connected for the first time following assembly, assume that the motor may immediately go to full throttle and handle the airplane accordingly.  Develop the habit of never reaching over the prop from the front when servicing the plane or connecting/disconnecting the battery.  In short, keep all body parts WELL CLEAR of the prop arc.

2.    Failsafe Settings

If the radio has a failsafe function, program it so that the throttle goes off when the failsafe activates.

3.   Throttle Kill Switch
Some radios have a throttle kill switch.  When the kill switch is set to the active position, power to the motor is off regardless of throttle stick position. Use this switch if your radio has one.

4.     Arming Plug

Use of an Arming Plug, as shown in the attachment below, is highly recommended.  When the Arming Plug is removed, power will not be applied to the ESC and the motor will not run.  In operation, the Arming Plug is connected as the last step prior to taxiing/flying and is removed as the first step after landing/taxiing.

5. Power Sequencing

 Power Application
A. Position the throttle stick to off and turn the transmitter on.
B. If the airplane has separate receiver and motor batteries, apply power to the receiver first.
C. Apply motor battery power.

Power Removal
A. Remove motor battery power.
B. Remove receiver power if the airplane has separate receiver and motor batteries.
C. Remove transmitter power.

Arming Plug.pdf356.27 KB
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