Mixed Deck — All NAR HPR Topics Flashcards

What is the purpose of 'dog barf' (cellulose wadding or fire blanket) placed above the motor in a rocket?

Answer: To protect the recovery system from ejection charge gases and hot particles

Wadding or a fireproof blanket shields the recovery parachute and shock cord from the hot gases and burning particles produced by the ejection charge.

What effect does extremely cold ambient temperature have on alkaline batteries used in avionics bays?

Answer: It significantly reduces capacity and can cause voltage sag under load

Cold temperatures slow the electrochemical reactions in alkaline batteries, reducing usable capacity and causing voltage to drop more rapidly under current draw.

What determines the classification of a rocket motor?

Answer: Total impulse measured in Newton-seconds

Rocket motors are classified by total impulse (Newton-seconds), with each letter designation representing a doubling of the impulse range from the previous letter.

What charge output specification must a rocketeer verify when selecting an altimeter for a specific airframe diameter?

Answer: Maximum current output and recommended e-match resistance range

The altimeter's pyro output current must be sufficient to fire the chosen e-match within its specified resistance range to guarantee reliable ignition.

What is the purpose of a launch checklist?

Answer: To ensure all launch protocols are completed

A launch checklist is an indispensable tool for high-power rocketry, ensuring that every critical step and safety protocol is meticulously followed before a launch. It helps prevent omissions, verifies proper rocket assembly, motor installation, and recovery system readiness. By systematically checking off items, the checklist significantly reduces the risk of accidents or malfunctions due to human error.

For a Level 3 NAR certification attempt, how many TAP members must witness and approve the flight?

Answer: Two TAP members

NAR Level 3 certification requires two currently active TAP members to witness and approve both the documentation review and the certification flight.

What is the purpose of a 'nomex chute protector' in a recovery bay?

Answer: To shield the parachute from hot ejection gases during deployment

Nomex (aramid) is heat-resistant and wraps around the parachute to protect it from scorching by the hot gases produced by the ejection charge.

Which wiring practice is critical to prevent RF interference from triggering e-matches in high-power rocketry electronics?

Answer: Twisting pyro lead wires together and keeping runs short

Twisting pyro lead wires cancels induced electromagnetic fields and keeping runs short minimizes the loop area that can act as an antenna.

What safety gear should be used when handling rocket motors?

Answer: Goggles and gloves

When handling rocket motors, especially during preparation or loading, there's a risk of accidental propellant exposure or ignition. Goggles protect the eyes from chemical splashes or debris, while gloves prevent skin contact with propellants and ensure a secure grip, enhancing overall safety.

What factor most affects rocket stability during flight?

Answer: The relationship between center of gravity and center of pressure

The relationship between center of gravity (CG) and center of pressure (CP) determines aerodynamic stability, with CG needing to be forward of CP for stable flight.

Which federal agency requires a waiver or authorization for high-power rocket flights above 18,000 feet AGL?

Answer: FAA

The FAA requires a Certificate of Authorization (COA) or waiver for HPR flights that penetrate Class A airspace above 18,000 feet MSL.

What determines the classification of a rocket motor?

Answer: Total impulse measured in Newton-seconds

Rocket motors are classified by total impulse (Newton-seconds), with each letter designation representing a doubling of the impulse range from the previous letter.

What determines the classification of a rocket motor?

Answer: Total impulse measured in Newton-seconds

Rocket motors are classified by total impulse (Newton-seconds), with each letter designation representing a doubling of the impulse range from the previous letter.

What is the primary safety concern during rocket launch operations?

Answer: Ensuring the launch area is clear and all safety distances are maintained

Maintaining clear launch areas and proper safety distances is the primary concern, protecting all participants and spectators from potential hazards.

What is the role of the rocket's nose cone?

Answer: To reduce drag and improve aerodynamics

The nose cone is the foremost part of a rocket, specifically shaped to minimize air resistance. Its aerodynamic design, typically a pointed or curved shape, allows the rocket to cut through the air more efficiently, reducing drag and improving overall flight performance.

Which of the following is a safe procedure when connecting e-matches to an altimeter before a flight?

Answer: Connect e-matches first, then install the battery

E-matches should be connected before the battery is installed so the altimeter has no power and cannot accidentally fire the pyro channels during connection.

What regulatory requirements apply to high-power rocketry?

Answer: FAA waiver for airspace, fire marshal notification, and NAR/TRA certification

High-power rocketry requires FAA airspace waivers, fire marshal notifications, and flier certification through NAR or TRA, ensuring safe operations.

A rocketeer holds NAR Level 2 certification. Can they assist in certifying another person's Level 1 flight?

Answer: Yes, Level 2 (or higher) certified members can certify Level 1 flights

Any NAR member certified at or above the level being attempted may serve as a certifier for lower certification levels.

What documentation must be filed for a high-power rocket flight?

Answer: Flight log and motor certification documents

Maintaining a flight log is essential for tracking rocket performance, identifying potential issues, and demonstrating compliance with safety regulations. Motor certification documents prove that the motors used meet NAR standards for safety and performance, which is crucial for legal and insurance purposes. These documents collectively ensure accountability and safe operation within high-power rocketry.

When transitioning between treatment phases, what is essential?

Answer: Document the rationale for change and update goals accordingly

Documenting the rationale for treatment phase changes and updating goals ensures continuity of care, clear communication, and appropriate progress tracking.