s p a r k s programming a kill switch for your electric n.
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S.P.A.R.K.S. Programming a kill switch for your electric . Alan Buckner Aug 3 , 2011. Contents. What is a kill switch? Why is a kill switch needed? Live demo Programming examples: Spektrum example Futaba example Why do we need 100% offset?. What is a kill switch.

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contents
Contents
  • What is a kill switch?
  • Why is a kill switch needed?
  • Live demo
  • Programming examples:
    • Spektrum example
    • Futaba example
  • Why do we need 100% offset?
what is a kill switch
What is a kill switch
  • Kill Switch Definition: A switch that will stop (kill) an engine or prevent a motor from operating.
  • Fuel Engines
    • Kill switch is needed to stop the engine from running after being started
    • Two types:
      • Throttle Cut feature, dependent on the throttle servo
      • Optoswitch. Required for some events.
  • What about Electrics?
    • Some ESCs are programmed to not start until the throttle is cycled.
    • I don’t know of any TX that has a kill switch feature for electrics
why is a kill switch needed
Why is a kill switch needed?

Unlike a fuel plane, the issue is that electrics will start immediately when any of the following accidentally occur:

  • Your neck strap hits the throttle stick
  • You drop or tip over your transmitter
  • You hit it with your finger accidentally

I have heard of many people being cut by props or damaging a plane due to this. I even know someone in this club who is very careful but needed stitches because of this. Accidents happen…

spektrum example 1
Spektrum Example 1
  • It seems there are two ways to accomplish this which are similar. Example 1 is what I figured out through experimentation.
spektrum example 2
Spektrum Example 2

Example 2 is from: http://www.rc-soar.com/spektrum/index.htm

Implementing a Throttle Kill function

  • There is no throttle kill function provided with the DX-7, instead there's 'Throttle Idle Recovery'.
  • For those who prefer a traditional Kill function, here's a solution which works off the MIX switch:
  • Use PMIX-5 or PMIX-6
  • mix THRO->THRO
  • SW=MIX
  • Rate = -100 / -100 (note both negative)
  • Offset = -125 (note negative)

Note 1: use only PMIX-5 or 6, otherwise the kill setting will vary with idle trim.

Note 2: The kill position is adjusted via Offset.

futaba example page 1
Futaba Example – Page 1
  • Throttle to throttle, linear mix
  • Note that trim is inhibited from affecting this mix
futaba example page 2
Futaba Example – Page 2
  • Rates are opposite to negate the throttle
  • Rate B may not be necessary to set
  • For some reason, I needed 104% to fully stop the prop, even though trim should not affect this mix.
futaba example page 3
Futaba Example – Page 3
  • Assigned to switch “G”
  • Note that mix “off” means “throttle stick active” so I changed the switch assignments.
why do we need 100 offset
Why do we need -100% offset?

Bi-directional linear

A Slave  B

A  Master  B

why do we need 100 offset1
Why do we need -100% offset?

Bi-directional linear

Bi-directional anti-linear

A Slave  B

A Slave  B

A  Master  B

A  Master  B

why do we need 100 offset2
Why do we need -100% offset?

Bi-directional linear

Bi-directional anti-linear

A Slave  B

A Slave  B

A Slave  0

A  Master  B

A  Master  B

0 Master  A

Uni-directional anti-linear

why do we need 100 offset3
Why do we need -100% offset?

Bi-directional linear

Bi-directional anti-linear

Slave Stick

Slave Stick

Slave Stick

Slave Stick

U  0

U  0  D

U  0  D

U 0  D

0 U

D 0  U

D 0  U

D 0  U

Master Stick

Master Stick

Master Stick

Master Stick

Uni-directional anti-linear

Uni-directional anti-linear on dual axis

Offset

tips cautions
Tips / Cautions
  • Depending on the transmitter and mix used, the throttle trim may still move the prop even with the kill switch activated. In many cases, this can be disabled.
  • Before turning on my TX, always ensure all switches are in their default positions, but there’s a catch on some transmitters. The mix “on” is actually throttle “off”. Spektrum TXs force “on” to be down/forward which is confusing. I loosened my switch and twisted it around  My Futaba allows me to program the switch direction.
  • After programming, hold the plane in case you programmed it incorrectly. It may go to full power!
  • Always ensure that your throttle stick is low before enabling or it may turn on at high throttle.
  • From what I have read, you cannot do this on the DX6i