NAR HPR Recovery Systems & Deployment 3

Question 1

Which type of pyrotechnic device is most commonly used to separate rocket sections for recovery deployment?

Accepted Answer

Black powder charge in a sealed charge cup

Answer

A measured black powder charge in a sealed cup or bulkhead produces the controlled gas pressure needed to separate sections and deploy parachutes.

Question 2

What does 'apogee deployment' refer to in high-power rocketry recovery?

Accepted Answer

Releasing the drogue chute at or near the peak of the flight

Answer

Apogee deployment releases the drogue parachute at peak altitude, stabilizing the rocket for the remainder of descent before main chute deployment.

Question 3

A recovery harness rated for 1000 lbs is used on a 20 lb rocket. Which scenario could still cause harness failure?

Accepted Answer

Shock load from sudden snatch force exceeding static rating

Answer

Snatch force — the sudden jerk when a parachute fully inflates — can create dynamic loads far exceeding the static weight, potentially overloading rated hardware.

Question 4

What is the primary advantage of using a deployment bag (D-bag) for main parachute packing?

Accepted Answer

It controls staged canopy inflation to reduce snatch force

Answer

A deployment bag retains the canopy until the suspension lines are fully stretched, staging inflation and dramatically reducing peak snatch force.

Question 5

Under NAR HPR rules, a rocketeer's recovery system must return the rocket to the ground at a speed considered safe. What is the commonly accepted maximum descent rate for the main canopy phase?

Accepted Answer

Under 20 mph

Answer

NAR guidelines target landing speeds under roughly 20 mph to prevent damage to the rocket and injury hazards to spectators.

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

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

NAR HPR Recovery Systems & Deployment 3