Summary

The Remove Before Flight Arming Switch (RBF) is used to arm rockets and payloads on the pad. This system is more reliable and repeatable than a recessed switch or key switch that is normally used.

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Construction

The RBF is comprised of 5 components and 4 screws. The main body of the switch is machined of aluminum and provides the mounting for all the other components, along with 2 threaded holes for mounting the switch to the rocket. The next largest component is the steel pin, which is turned and cross-drilled to accept a warning tag.

The remaining components are all stock. The switch electronically operates with two micro limit switches, which are wired in series to provide dual redundancy. There is also space for a third to be added if needed, which would allow for the activation of one critical and one non-critical system with a single pin.

The pin is retained by a commercially available ball detent. The detent applies force to a groove in the pin, and requires 15 pounds of force pulling outwards to overcome. The force required to remove the pin can be adjusted by tightening or loosening the ball detent.

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Operation

To arm the RBF, the pin must be pulled completely clear of the rocket. This will allow the micro limit switches to actuate and arm the electronics.

If the onboard electronics have been setup to support this function, re-installing the pin into the switch can disarm the connected systems.