HPR Level 2—Section C: Range and Safety Practices
C1) What is the maximum launch angle, measured from vertical, for a High Power Rocket?
A) 10 degrees
B) 15 degrees
C) 20 degrees
D) 25 degrees
C2) What is the maximum wind velocity allowable for launch operations?
A) 20 miles per hour
B) 25 miles per hour
C) 15 miles per hour
D) 30 miles per hour
C3) 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?
A) 100 feet
B) 320 feet
C) 750 feet
D) The launcher may be located anywhere on the launch site to compensate for wind
C4) 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?
A) 100 feet
B) 1,500 feet
C) 3,000 feet
D) The launcher may be located anywhere on the launch site to compensate for wind
C5) 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?
A) 1,800 feet
B) 4,500 feet
C) 9,000 feet
D) 18,000 feet
C6) 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?
A) 500 feet
B) 1,250 feet
C) 1,500 feet
D) 4,000 feet
C7) 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 __________
A) 1/4, 1,500 feet
B) 1/2, 1,500 feet
C) 1/4, 2,500 feet
D) 1/2, 2,500 feet
C8) 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?
A) 750 feet
B) 1,500 feet
C) 3,000 feet
D) 5,280 feet (1 mile)
C9) 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?
A) 750 feet
B) 1,500 feet
C) 3,000 feet
D) You cannot launch unless the house is empty
C10) 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?
A) Yes
B) Yes, but the pads have to be the minimum personnel distance from the edge of the field
C) Yes, but the house has to be empty
D) No
C11) What is the minimum personnel distance from a High Power Rocket containing a single “I” motor?
A) 200 feet
B) 100 feet
C) 75 feet
D) 50 feet
C12) What is the minimum personnel distance from a High Power Rocket containing three (3) “H” motors?
A) 200 feet
B) 100 feet
C) 75 feet
D) 50 feet
C13) What is the minimum personnel distance from a High Power Rocket containing two (2) “K” motors?
A) 50 feet
B) 100 feet
C) 300 feet
D) 500 feet
C14) Which of the following items used for motor ignition may accidentally ignite by the continuity test of some launch controllers?
A) Nichrome wire
B) Flashbulbs
C) Very low current electric matches
D) Both “B“ and “C“ above
C15) In the event of a misfire, how long should you wait before approaching the launch pad?
A) 15 seconds
B) 60 seconds
C) 5 minutes
D) As soon as signs of smoke are gone
C16) Which of the following is most likely to cause catastrophic failure of a black powder rocket motor?
A) Temperature cycling
B) Electromagnetic fields
C) Vibration
D) High altitude
C17) Unless the motor manufacturer instructs otherwise, igniters for clustered rocket motors should be wired together in:
A) Series
B) Parallel
C) Short Circuit
D) Open
C18) When can igniters that are installed in rocket motors be checked for continuity?
A) Any time
B) Only in an enclosed shelter
C) Only on the launch pad when ready for launch
D) Igniters should never be checked for continuity while installed in a rocket motor
C19) Which of the following is the preferred method for attaching fins to a High Power Rocket?
A) Tube surface mounting
B) “Wedge” mount
C) “Though the wall” mounting
D) All fin mounting methods are all equally strong; it does not matter
C20) Which of the following adhesives should not be used on rubber (or elastic) shock cord components?
A) Slow-curing epoxy adhesives
B) Cyanoacrylate glues (AKA “CA” or super glue)
C) Aliphatic resin-based (yellow) glues
D) White “Elmer’s” type glues
C21) Which of the following adhesives is most likely to be weakened under humid or wet weather conditions?
A) Slow-curing epoxy adhesives
B) Cyanoacrylate glues (AKA “CA” or super glue)
C) Aliphatic resin based (yellow) glues
D) White “Elmer’s” type glues
C22) Which of the following adhesives is best for motor mount construction using phenolic motor tubes?
A) Slow-curing epoxy adhesives
B) Cyanoacrylate glues (AKA “CA” or super glue)
C) Aliphatic resin based (yellow) glues
D) “Hot melt” adhesives
C23) 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?
A) Slow-curing epoxy adhesives
B) Cyanoacrylate glues (AKA “CA” or super glue)
C) Aliphatic resin based (yellow) glues
D) “Hot melt” adhesives
C24) 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?
A) This hole allows excessive ejection charge pressures to vent to reduce shock cord stress
B) The hole is used for air pressure readings for onboard altimeters
C) The hole vents internal air pressure as the rocket gains altitude to prevent internal air pressure from prematurely separating the model
D) The hole allows easy verification that a parachute is installed
C25) When clustering combinations of black powder and composite motors, which type of rocket motor should be ignited first?
A) Composite motors should be ignited first
B) Black powder motors should be ignited first
C) It does not matter which motors are ignited first
D) Clusters should never mix composite and black powder motors
C26) Why should composite motors be ignited first in a composite and black powder mixed cluster?
A) Composite motors are more difficult and take longer to ignite
B) Composite motors are more likely to “cato” than black powder motors
C) The exhaust products from black powder motors prevent composite motor ignition
D) Composite motors are more powerful than black powder motors
C27) If individual igniters are used for igniting a motor cluster, which of the following statements is typically true:
A) The launch control must have an audible as well as visual indication of igniter continuity
B) The launch control must provide additional current to ignite the additional igniters
C) The launch control must provide higher voltage to ignite the additional igniters
D) The launch control must use a car battery as a power source
C28) What is (are) the advantage(s) of using a “relay” type launch control?
A) It is cheaper than a non-relay launch control
B) The relay allows a better indication of igniter continuity
C) It can deliver more power to the rocket motor igniters
D) Both “B” and “C” above
C29) Petroleum based lubricants should not be used with the oxygen or nitrous oxide systems used in hybrid rocket motors. Why?
A) They thicken when exposed to oxygen or nitrous oxide
B) They lose their lubricating properties when exposed to oxygen or nitrous oxide
C) There is a risk of spontaneous ignition or explosion
D) The lubricant can promote corrosion of the metal components in the presence oxygen or nitrous oxide
C30) Which of the following safety hazards may be associated with hybrid rocket motors?
A) High pressure gas & low temperatures (frostbite)
B) Low temperatures (frostbite)
C) Corrosive materials
D) High pressure gas
C31) The Range Safety Officer (RSO) says that your model is unsafe to fly. Who has the authority to overturn this ruling?
A) The Launch Control Officer (LCO)
B) The individual who “checked-in“ the model
C) Three high power certified flyers who agree the model is safe
D) The RSO’s decision cannot be overturned by anyone
C32) Parachute ejection systems that sense barometric pressure for activation need a vent to the outside in their compartment because:
A) This hole allows excessive ejection charge pressures to vent
B) This hole is used to sample air pressure readings outside the rocket’s airframe
C) This hole vents internal air pressure as the rocket gains altitude to prevent internal air pressure from prematurely separating the model
D) This hole allows easy verification that the battery is installed
C33) Which of the following individuals has the final authority in permitting a High Power Rocket to fly?
A) The Launch Control Officer (LCO)
B) The Range Safety Officer (RSO)
C) The Check-in Officer
D) The rocket owner
C34) Which of the following individuals has the ultimate responsibility to ensure that a rocket was built in a safe manner?
A) The Launch Control Officer (LCO)
B) The Range Safety Officer
C) The rocket owner/builder
D) All of the above
C35) Parachute ejection systems that sense barometric pressure can malfunction during supersonic flight because:
A) Aerodynamic heating changes the values of electronic components
B) The outside pressure distribution is not continuous around the model
C) Static discharges will “zap” sensitive electronic components
D) Both answers “A” and “B” are correct
C36) 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?
A) Parachute ejection occurred too soon after motor burnout
B) Parachute ejection occurred too late after apogee
C) Parachute ejection occurred at apogee on a vertical flight
D) Both “A” and “B”
C37) Your payload section, with a heavy payload, separated from your model immediately after motor burnout. What might be the cause?
A) The center of pressure at burnout was behind the center of gravity
B) The payload shoulder was too loose in the body tube
C) The rocket motor had a failure of its delay system
D) Both “B” and “C” are correct
C38) 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?”
A) 10 feet
B) 30 feet
C) 50 feet
D) 75 feet
C39) 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?”
A) 10 feet
B) 30 feet
C) 50 feet
D) 75 feet
C40) 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)?
A) 30 feet
B) 50 feet
C) 75 feet
D) 150 feet
C41) What is “titanium sponge?”
A) A substitute for ejection wadding
B) An ingredient used in some rocket motors that emit sparks in the exhaust
C) An effective cleaning tool for high power rocket motor casings
D) A lightweight material used in nose cones on supersonic rockets
C42) 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
C43) According to NAR studies, the vast majority of unsuccessful flights fail because of:
A) Unstable rocket designs
B) Rocket motor malfunctions
C) Recovery system failures
D) Structurally unsound rockets
C44) The kinetic energy of a descending rocket is a function of:
A) Its mass
B) Its velocity
C) Its mass times its velocity
D) Its mass times the square of its velocity
C45) 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
C46) When should onboard energetics and/or electronic controls be activated and when should they be inhibited?
A) 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.
B) When the rocket is in the prep area.
C) 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 D) Both “A” and “C”
D) Both “A” and “C”
C47) What equipment is required at launch sites?
A) Fire suppression devices (such as fire extinguishers)
B) First Aid kits
C) Fire suppression devices and First Aid kits
D) Fire suppression devices, First Aid kits, and a method of communicating with everyone at the launch site
C48) 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
C49) Your High Power Rocket lands on a power line. Which of the following is true?
A) You can retrieve it if the power line is on a wooden (not metal) pole
B) You must leave it alone and you must call the power company
C) You can retrieve it if you have a non-conductive tool, such as a “hot-stick”
D) You can retrieve it if part of it is already on the ground
C50) 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?
A) You are limited only by the HPR maximum wind of 20 miles per hour
B) You can fly at 15 mph, if you locate the pad at the upwind edge of the field and tilt into the wind
C) 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)
D) This field can only be used in calm winds for flights to the 3,000 foot altitude limit
C51) 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
C52) 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?
A) Consumption of alcohol
B) Use of medication that could affect judgment, movement, or stability
C) Using a cell phone due to possible interference with a rocket’s onboard energetics and/or electronic controls
D) Both “A” and “B” above
C53) 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.
A) 10 feet
B) 25 feet
C) 50 feet
D) 75 feet
C54) According to NFPA 1127, what extra constraints and launch distances are required when launching multiple High Power Rockets simultaneously?
A) The LCO shall appoint a contest judge to determine which rocket wins the liftoff
B) 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
C) For more than one (1) rocket, a minimum distance of 3 m (10 ft) shall exist between each rocket used
D) Both “B” and “C”
C55) What is a common safety practice to follow just before hooking up the igniter leads to a rocket?
A) Touch the igniter clips together to test for sparks in case the launch system is still accidentally energized
B) Run an additional simulation to ensure the rocket and motor are a safe combination
C) Check the skies to ensure no aircraft are in the area
D) Stand next to the rocket for a photograph
C56) An electronically actuated recovery system, as either a primary or backup deployment method, is required if the installed total impulse exceeds:
A) 1280 N-sec
B) 2560 N-sec
C) 5120 N-sec
D) 10240 N-sec
C57) Twisted wire pairs in rocket wiring are considered good practice because:
A) It reduces strain on solder joints
B) It improves the routing of wire bundles
C) It resists electromagnetic interference from internal and external sources
D) It reduces resistance in wire bundles
C58) Black powder charges for recovery systems can be unintentionally fired by:
A) Electrostatic discharge (static electricity)
B) Electromagnetic fields, e.g. nearby radios
C) Control electronics malfunction
D) All of the above
C59) The use of launch rails, e.g. 1010 and 1015, in lieu of launch rods is encouraged because:
A) Launch rails create less drag on the launching rocket
B) Launch rails are stiffer and less likely to impose unintentional tipoff on the rocket (no rod whip)
C) Launch rails are easier to clean than launch rods
D) All of the above
C60) Which sequence below provides the highest level of range safety when launching a rocket utilizing an onboard electronically actuated recovery system?
A) Arm recovery system electronics, install igniter, touch igniter clips together, connect clips to igniter
B) Install igniter, touch igniter clips together, connect clips to igniter, arm recovery system electronics
C) Install igniter, arm recovery system electronics, touch igniter clips together, connect clips to igniter
D) None of the above
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