NAR HPR Ignition Systems & Launch Controllers 2

Question 1

What is the typical resistance range for a properly installed high-power motor igniter as measured during a continuity check?

Accepted Answer

0.5 to 2.0 ohms

Answer

A properly installed igniter typically reads 0.5 to 2.0 ohms; readings significantly outside this range indicate a faulty igniter or poor electrical connection.

Question 2

What should a flyer do if the continuity check shows an open circuit (no continuity reading)?

Accepted Answer

Do not arm or launch; investigate and correct the problem before proceeding

Answer

An open circuit indicates the igniter is not properly connected; proceeding without continuity would result in a misfire and violates NAR safety rules.

Question 3

Which type of igniter is specifically designed and recommended for use with composite propellant high-power motors?

Accepted Answer

Copperhead or similar composite-compatible pyrotechnic igniter

Answer

Composite propellant motors require hotter igniters like copperheads designed to deliver sufficient energy to initiate the harder-to-ignite composite fuel grains.

Question 4

What is the purpose of having the RSO oversee or control the arming step of the launch controller?

Accepted Answer

To ensure proper oversight and prevent premature or unauthorized arming

Answer

RSO control of the arming step ensures proper procedural oversight and prevents premature, accidental, or unauthorized activation of the ignition system.

Question 5

What determines the required minimum length of launch lead cables connecting the controller to the igniter?

Accepted Answer

The length that places all personnel outside the minimum safe distance for the motor class being used

Answer

Launch lead length must be sufficient to place all operating personnel outside the minimum safe distance specified for the motor power level being used.

(NAR HPR) NAR High-Power Rocketry Certification Practice Test

(NAR HPR) NAR High-Power Rocketry Certification Practice Test

NAR HPR Ignition Systems & Launch Controllers 2