Level 2 NAR Exam

NFPA 1127

Which of the following National Fire Protection Association standards provides a code for High Power Rocketry?

Part 101

What part of the Federal Aviation Regulations govern rocket activity?

1,500 grams (50 ounces or 3.3 lb)

What is the maximum launch (flight-ready) weight allowable for a rocket which does not require an FAA Certificate of Waiver or Authorization?

125 grams (4.4 ounces)

What is the maximum propellant weight allowable for a rocket which does not require an FAA Certificate of Waiver of Authorization?

A minimum of 18 years of age

Which of the following is a requirement for High Power Rocket Motor User Certification?

40,960 Newton-seconds

What is the maximum total impulse permitted in a High Power Rocket per NFPA 1127?

There is no limit provided the rocket weighs less than 1/3 of the average certified thrust.

What is the maximum allowable weight for a High Powered rocket permitted per NFPA 1127?

18 years old

What is the minimum age for User Certification?

The motor uses a "composite" propellant

Which of the following characteristics does NOT meet the definition of a High Power Rocket motor?

The rocket is multi-staged or propelled by a cluster of rocket motors.

Which of the following is (are) true of a complex High Power Rocket per NFPA 1127?

Launching, recovering and parking

According to NFPA 1127, a launch site is defined as containing areas for which of the following activities?

NFPA 1127, FAA part 101, and federal, state, local laws and regulations

A person shall fly a High Power Rocket only in compliance with

:

The fuel is in a different physical state

According to NFPA 1127, which of the following statements is always true concerning the definition of a hybrid rocket motor?

No, Flights into any clouds are prohibited unless specifically waived by FAA

You're attending a launch that has a thin cloud layer at 3,000 ft and clear blue skies above it. It is okay to punch through the cloud layer with a high powered rocket if there is a waiver or authorization granting flights up to 6000 ft?

No, the five-tenths coverage and horizontal visibility limitations apply

You are attending a launch where the sky is almost completely obscured by clouds at 5,000 feet except for a ~1,000 foot wide "hole" directly over the launch pads. Is it okay to launch a High Power Rocket to 6,000 feet if there's a Certificate of Waiver or Authorization (COA) granting Class 2 flights up to 8,000 feet?

The total impulse is more than 160 N-s

According tp the NFPA 1127, which of the following statements is true concerning the definition of a High Power rocket motor?

A G35 with 66 g of propellant

Which of the following rocket motors is NOT a high power rocket motor?

All of the Above

What information does FAA FAR 101.29 require you provide when filing for FAA Launch Authorization?

A) Estimated number of rockets and type of propulsion (liquid or solid), fuel(s) and oxidizer(s) B) Description of the launcher(s) planned to be used, including any airborne platform(s) and description of recovery system C) Highest altitude, above ground level, expected to be reached, launch site latitude, longitude, and elevation, and any additional safety procedures that will be followed D) All of the above

At any altitude where clouds or obscuring phenomena of more than five-tenths coverage prevails. At any altitude where the horizontal visibility is less than five miles, and Into any cloud

Which of the following are operating limitations for Class 2 High Power Rockets per the FAA's FAR 101 Regulations?

All of the above

According to NFPA 1127, a High Power Rocket shall only be launched if:

A) It contains any combination of motors having 40,960 Newton-seconds of total impulse or less B) It contains a recovery system that is designed to return all parts to the ground intact and at a landing speed at which the rocket does not present a hazard

C) It utilizes an electronically actuated recovery system as either a primary or backup deployment method if the installed total impulse is greater than 2560 Newton-seconds

D) All of the above

When the motor manufacturer allows it

According to NFPA 1127, when is it acceptable to alter a High Power Rocket motor?

All of the above

According to NFPA 1127, the definition of a High Power Rocket is a rocket vehicle that:

A) Is propelled by one or more High Power Rocket motors

B) Is propelled by a combination of model rocket motors having an installed total impulse of more than 320 Newton-seconds or a combination of model rocket motors having more than a total of 125 grams (4.4 ounces) of propellant weight

C) Weighs more than 1500 grams (53 ounces or 3.3 pounds) with motor(s) installed

D) All of the above

It indicates the total power range or impulse range of the rocket motor

What does the "H" in the motor designation H100-5 stand for?

160.01

H impulse

It is the average thrust in Newtons of the rocket motor

What does the "100" in the motor designation H100-5 stand for?

It is the ejection charge delay time

What does the "5" in the motor designation H100-5 stand for?

Newtons

What are the units of measurement for the "100" in the motor designation H100-5?

1280.00 Newton-seconds

What is the maximum allowable impulse for a "J" rocket motor?

4 motors

Assuming that each motor has the full allowable impulse, how many "H" motors have the same total impulse as a single "J" motor?

320 (Newton-seconds) divided by 64 (Newtons) = 5 (seconds)

You have an H64-8 rocket motor which has been certified to have a total impulse of 320.00 Newton-seconds. What is the approximate burn time for this motor?

J

The manufacturer's test data shows a total impulse of 690 Newton-seconds for your motor. What impulse class does your motor represent?

I

The manufacturer's test data shows an average thrust of 100 Newtons for 6 seconds for your motor. What impulse class does your motor represent?

20 degrees

What is the maximum launch angle, measured from vertical, for a High Power Rocket?

20 miles per hour

What is the maximum wind velocity allowable for launch operations?

The launcher shall be no closer than the Minimum Personnel Distance from any boundary of the launch site, and the Minimum Personnel Distance for an H motor is 100 feet

The minimum launch site dimension for your field is 1,500 feet. According to NFPA 1127, what is the minimum distance between the launch site boundary and the launcher for a 320 Newton-second motor assuming no public highways or occupied buildings in the area?

The launcher shall be no closer than the Minimum Personnel Distance from any boundary of the launch site, and the Minimum Personnel Distance for an H motor (320 N- sec) is 100 feet.

You plan to break the altitude record for "H" motors with a flight to 10,900 feet. You have a field that is 6,000 feet by 6,000 feet and a Certificate of Waiver or Authorization for flights up to 12,000 feet AGL. According to NFPA 1127, what is the minimum distance between the launch site boundary and the launcher for an H-powered altitude record attempt assuming no public highways or occupied buildings are in the area?

The size of the launch site is no less than one half (1/2) of the maximum altitude expected, calculated, simulated, or granted, so 9000 ft

The FAA has granted a Certificate of Waiver or Authorization for High Power Rocket flights up to 18,000 feet AGL for your event. If flights up to that altitude are expected, what is the minimum launch site dimension?

the launcher has to be the Minimum Personnel Distance, which for an O-impulse cluster is 2,000 feet, from the edges of the launch site. So even for a COA of only 2,500 feet, it would require a minimum 4,000 foot launch site dimension.

The FAA has granted a Certificate of Waiver or Authorization for High Power Rocket flights up to 2,500 feet AGL for your 2x "N" cluster-powered rocket. What is the minimum launch site dimension?

1/2, 1,500 feet

Except as provided in NFPA 1127 Paragraph 4.14.2(3), in no case shall the minimum launch site dimension be less than __________ the estimated altitude of the High Power Rocket to be flown, or __________.

1,500 feet

Your launch site borders with an interstate freeway. What is the minimum distance allowable for location of a High Power Rocket launch pad from the interstate freeway?

1500 ft

A farm owner offers you the use of their two (2) mile square farm property for a launch site. Their house is located in the middle of the farm. What is the minimum distance allowable for location of a High Power Rocket launch pad from the owner's house, assuming it is occupied?

No

A farm owner offers you their farm for a launch site. Their house is located in the middle of the farm, which is one quarter (1/4) mile by one quarter (1/4) mile square. Assuming you can get an FAA Certificate of Waiver or Authorization for High Power Rocket flights up to 2,500 feet, can you conduct a high power launch from this farm?

100 feet

What is the minimum personnel distance from a High Power Rocket containing a single "I" motor?

200 feet

What is the minimum personnel distance from a High Power Rocket containing three (3) "H" motors?

500 feet

What is the minimum personnel distance from a High Power Rocket containing two (2) "K" motors?

Flash Bulbs and low current ematches

Which of the following items used for motor ignition may accidentally ignite by the continuity test of some launch controllers?

60 seconds

In the event of a misfire, how long should you wait before approaching the launch pad?

Temperature cycling

Which of the following is most likely to cause catastrophic failure of a black powder rocket motor?

Parallel

Unless the motor manufacturer instructs otherwise, igniters for clustered rocket motors should be wired together in:

Only on the launch pad when ready for launch

When can igniters that are installed in rocket motors be checked for continuity?

"Though the wall" mounting

Which of the following is the preferred method for attaching fins to a High Power Rocket?

Cyanoacrylate glues (AKA "CA" or super glue)

Which of the following adhesives should not be used on rubber (or elastic) shock cord components?

White "Elmer's" type glues

Which of the following adhesives is most likely to be weakened under humid or wet weather conditions?

Slow-curing epoxy adhesives

Which of the following adhesives is best for motor mount construction using phenolic motor tubes?

Slow-curing epoxy adhesives

The centering rings provided with your High Power Rocket kit are a loose fit around the phenolic motor tube. Which of the following adhesives is the best choice for a strong joint?

The hole vents internal air pressure as the rocket gains altitude to prevent internal air pressure from prematurely separating the model

A small hole is typically recommended near the top, but below the nosecone or payload section shoulder, of a High Power Rocket's booster section. Why?

Composite motors should be ignited first

When clustering combinations of black powder and composite motors, which type of rocket motor should be ignited first?

Composite motors are more difficult and take longer to ignite

Why should composite motors be ignited first in a composite and black powder mixed cluster?

The launch control must provide additional current to ignite the additional igniters

If individual igniters are used for igniting a motor cluster, which of the following statements is typically true:

It can deliver more power to the rocket motor igniters

What is (are) the advantage(s) of using a "relay" type launch control?

There is a risk of spontaneous ignition or explosion

Petroleum based lubricants should not be used with the oxygen or nitrous oxide systems used in hybrid rocket motors. Why?

High pressure gas & low temperatures (frostbite)

Which of the following safety hazards may be associated with hybrid rocket motors?

The RSO's decision cannot be overturned by anyone

The Range Safety Officer (RSO) says that your model is unsafe to fly. Who has the authority to overturn this ruling?

This hole is used to sample air pressure readings outside the rocket's airframe

Parachute ejection systems that sense barometric pressure for activation need a vent to the outside in their compartment because:

The Range Safety Officer (RSO)

Which of the following individuals has the final authority in permitting a High Power Rocket to fly?

The rocket owner/builder

Which of the following individuals has the ultimate responsibility to ensure that a rocket was built in a safe manner?

The outside pressure distribution is not continuous around the model

Parachute ejection systems that sense barometric pressure can malfunction during supersonic flight because:

Parachute ejection occurred too soon or too late after motor burnout

Your rocket returned from its flight with "zipper" damage where the shock cord tore through the model's airframe. What is the most likely cause?

The payload shoulder was too loose in the body tube OR The rocket motor had a failure of its delay system

Your payload section, with a heavy payload, separated from your model immediately after motor burnout. What might be the cause?

50 feet

What is the distance around a launch pad for a "J" powered model that must be cleared of easy to burn material, assuming the motor is not "sparky?"

75 feet

What is the distance around a launch pad that must be cleared of easy to burn material for a rocket using a 2- motor cluster of full impulse "J" motors, assuming the motors are not "sparky?

75 feet

What is the distance around a launch pad to clear of all combustible and burnable materials for a rocket using a single "J" motor that uses titanium sponge in the propellant to emit sparks ("sparky" motor)?

An ingredient used in some rocket motors that emit sparks in the exhaust

What is "titanium sponge?"

All of the above

Consequences of inadequate motor retention can include:

A) The motor being ejected at apogee instead of the parachute, resulting in two falling objects

B) The motor being ejected from a cluster and flying on its own, under power

C) The motor flying through the rocket, destroying it

D) All of the above

Recovery system failures

According to NAR studies, the vast majority of unsuccessful flights fail because of:

Its mass times the square of its velocity

The kinetic energy of a descending rocket is a function of:

All of the above

You have an excellent flying field except that when winds are from the northwest at over 10 mph, rockets often drift into neighboring fields where you don't have permission to fly. Your alternatives include:

A) Limit flights to lower altitudes so rockets stay on the field

B) Move the launch pad closer to the NW edge of the field, provided there are no roads or houses within 1500 feet

C) Don't fly at times when the wind is problematic

D) All of the above

The function of firing circuits and onboard energetics shall be inhibited until the High Power Rocket is in the launch position. They can then be activated when non-essential personnel leave the pad area.

The function of firing circuits and onboard energetics shall be inhibited prior to removing the High Power Rocket from the launch position, and doing so only when non-essential personnel are not in the pad area unless otherwise directed by the RSO

When should onboard energetics and/or electronic controls be activated and when should they be inhibited?

Fire suppression devices, First Aid kits, and a method of communicating with everyone at the launch site

What equipment is required at launch sites?

All of the above

The Range Safety Officer (RSO) is concerned about your High Power Rocket's stability. Which of the following can be applied to determine the model's stability?

A) Fly a sub-scale, model rocket version of the actual model B) Perform manual calculations to determine the rocket's Center of Pressure (CP) location and verify the prelaunch Center of Gravity (CG) location C) Provide simulation data showing the rocket's Center of Pressure (CP) location and prelaunch Center of Gravity (CG) locations D) All of the above

You must leave it alone and you must call the power company

Your High Power Rocket lands on a power line. Which of the following is true?

You can fly in winds up to about 6 miles per hour, if you have the pads located closer to the upwind edge of the field and the rocket flies vertically (assuming minimum distances are maintained)

Your field is 1500 x 1500 feet and your FAA Certificate of Waiver or Authorization is 3,000 feet AGL. If you use parachutes sized to bring your rockets down at 20 feet per second, what is the maximum wind you can fly in for a rocket that will reach the altitude limit with an "H" motor?

An audible or visual indicator showing continuity through the rocket motor igniter

According to NFPA 1127, which of the following is NOT a required feature of a rocket motor ignition system (launch controller)?

A) A removable interlock device in series with the launch switch B) The system is electrically operated C) The launching switch returns to the "off" position when released D) An audible or visual indicator showing continuity through the rocket motor igniter

Consumption of alcohol and use of medication that could affect judgment, movement, or stability

According to NFPA 1127, which of the following are prohibited activities for participants prepping or launching High Power Rocket's as well as for spectators in the prepping areas?

25 feet

According to NFPA 1127, High Power Rocket motors, motor reloading kits, and pyrotechnic modules shall be stored at least __________ away from smoking, open flames, and other sources of heat.

For three (3) or more rockets, the minimum spectator and participant distance shall be the value set forth in Table 4.16.3 for a complex rocket with the same total installed impulse but not more than 610 m (2000 ft), or 1.5 times the highest altitude expected to be reached by any of the rockets, whichever is less AND For more than one (1) rocket, a minimum distance of 3 m (10 ft) shall exist between each rocket used

According to NFPA 1127, what extra constraints and launch distances are required when launching multiple High Power Rockets simultaneously?

Touch the igniter clips together to test for sparks in case the launch system is still accidentally energized

What is a common safety practice to follow just before hooking up the igniter leads to a rocket?

It resists electromagnetic interference from internal and external sources

Twisted wire pairs in rocket wiring are considered good practice because:

Electrostatic discharge (static electricity), Electromagnetic fields, e.g. nearby radios OR Control electronics malfunction

Black powder charges for recovery systems can be unintentionally fired by:

Launch rails are stiffer and less likely to impose unintentional tipoff on the rocket (no rod whip)

The use of launch rails, e.g. 1010 and 1015, in lieu of launch rods is encouraged because:

Arm recovery system electronics, install igniter, touch igniter clips together, connect clips to igniter

Which sequence below provides the highest level of range safety when launching a rocket utilizing an onboard electronically actuated recovery system?

The center of pressure (CP) must be behind the center of gravity (CG)

For a rocket to be stable, which of the following statements is true?

Adding sufficient weight to the nose cone

An unstable rocket can be made stable by:

Determining the relative positions of the center of pressure (CP) and center of gravity (CG)

Rocket stability can be estimated by:

The "Barrowman" method or The "cardboard cutout" method

A rocket's center of pressure can be estimated by using:

Increasing the size of the aft fins

An unstable rocket can usually be made stable by:

Become more stable in flight

During boost, a rocket powered by a solid rocket motor tends to:

A) Weak tubes or couplers that permit airframe bending

B) Misaligned motor mount tube or motor nozzle

Or

C) Inadequate airspeed leaving the launch pad on a windy day

Which of the following can cause unstable flight?

The center of pressure should be at least 1.0 body tube diameters behind (aft) the center of gravity

As a rule of thumb, how far should the center of pressure be from the center of gravity?

Where the center of gravity (CG) is located ahead (forward) of the center of pressure (CP)

The definition of Positive Stability in regards to a rocket is: