NAR HPR Ignition Systems & Launch Controllers 3

Question 1

What does the 'arm' switch on a launch controller do in the ignition sequence?

Accepted Answer

It enables the high-current firing circuit so the launch button can complete ignition

Answer

It connects the battery to power only the continuity indicator light

Answer

It physically disconnects the safety key from the control circuit

Answer

It sends a low-power test pulse through the igniter to verify resistance

Question 2

What should be done with the launch controller leads during the mandatory wait period following a misfire?

Accepted Answer

Leave them connected while all personnel remain at the required safe distance

Answer

Disconnect them from the igniter immediately to make the system safe

Answer

Short them together to drain any residual current from the system

Answer

Connect a continuity meter to the leads to diagnose the fault remotely

Question 3

What is the purpose of a nozzle plug used with high-power rocketry motors?

Accepted Answer

To protect the propellant grain from moisture and debris until the igniter is installed

Answer

To cap unused nozzle holes in multi-nozzle or cluster motor configurations

Answer

To serve as an electrical connector joining igniter leads to the launch controller

Answer

To prevent motor ejection or forward motion of the motor during high-G flight

Question 4

At what stage of launch preparation should the launch controller leads be physically connected to the igniter?

Accepted Answer

At the pad, as the final step immediately before the RSO arms the system

Answer

At the prep area before loading the motor into the airframe

Answer

After motor loading but before the rocket is transported to the launch pad

Answer

At the pad, before inserting the safety key

Question 5

Why is it important to verify that no RF transmitters are active near a rocket on the launch pad?

Accepted Answer

RF energy can induce current in igniter leads and potentially cause inadvertent ignition

Answer

RF interference can corrupt the rocket's onboard altimeter flight data

Answer

Radio waves can chemically degrade composite propellant grains over time

Answer

RF transmitters can drain the launch controller battery through electromagnetic coupling

Question 6

What type of launch controller capability is required when igniting a cluster of two or more motors simultaneously?

Accepted Answer

A controller with multiple independent channels or high-current simultaneous multi-igniter capability

Answer

Any standard single-channel controller with a fully charged 12V battery

Answer

A wireless RF controller for increased operator safety

Answer

A controller with a minimum 24-volt output to overcome combined igniter resistance

Question 7

According to NAR safety rules, who holds final authority to give the launch command at a sanctioned high-power rocket launch?

Accepted Answer

The Range Safety Officer (RSO) or designated launch control officer

Answer

The certified owner or flyer of the rocket being launched

Answer

Any NAR member with a Level 2 or higher certification present at the launch

Answer

The owner or operator of the launch site property