I do have some concerns about the certification process however. There was a user on the forum who was completely in the dark as to why his rocket (shaped like a submarine) was unstable...yet he had earned a NAR Level 1 cert building only kit rockets before this happened. In my opinion, that should not have occurred, period. By the time a person reaches Level 1, they need to have a firm understanding of why and how rockets fly, including the CP/CG relationship. I'm not interested in a certification because I don't plan to go HPR, so I don't know the details of the certification process. Was there a failure here?
FC
He should have discussed/shown CG/CP on his L1 rocket. Being a kit it may have been quickly done or overlooked due to be obviously stable. The written test for L2 is more comprehensive, though the process leads slightly more toward memorizing than learning. It doesn't make people qualified rocket scientists, but I think it does a good job of adding a layer of safety and understanding. As nice as a written test for L1 would be, I think it would drive people away from high power. Even with no written test, they have to demonstrate a basic understanding of rocketry and stability. (and have the CP marked on the rocket) I'd say if he didn't understand CG/CP there was a failure in the process.
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From TRA-
Level 1 Certification allows flyers to fly High Power Rockets with a total installed impulse up
to 640 n-sec.
Airframe – The rocket must be built by the flyer. The rocket shall have a display on the
exterior identifying the calculated center of pressure. The rocket must be of “conventional
rocket design”. “Odd Rockets” including flying pyramids, saucers and flying spools will not be
allowed for any certification flight. The rocket may be either a kit or scratch built. Scratch built
rockets may contain commercially built components.
Recovery - Standard parachute recovery is required. Non-parachute recovery methods (e.g.
tumble, helicopter, gliding, etc) are not permitted for certification flights. If the rocket is using
dual deployment, the first event recovery may be via drogue-less or streamer as long as the
main or second event uses a standard parachute.
Motor – The certification flight must be with a single certified H or I motor (tested total impulse
between 160.01 and 640.00 n-sec). Staged and/or Clustered rockets may not be used for
certification flights. The flyer shall be observed by the certifying member or their designated
representative during the assembly (if a reload or hybrid) and preparation of the motor.
Electronics – Electronics are not required for level 1 certification flights.
Certification Flight – Level 1 Certification flight may take place at any insured launch. The
certifying member (i.e. Prefect, TRA Director, or TAP Member) must be present and witness
the certification flight. The certifying member must witness the rocket ascend in a stable
manner and descend in stabilized manner controlled by the recovery system.
Post-Flight Inspection – The rocket must be presented to the certifying member for
inspection. If the rocket cannot be recovered, but can be inspected in place (power lines, tree,
etc…
this is acceptable. The certifying member shall inspect the rocket for excessive
damage. Excessive damage shall be considered damage to the point that if the flyer were
handed another motor, the rocket could not be put on the pad and flown again safely.
Damage caused by wind dragging will not cause a disqualification.
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