High Power Rocketry, also known as HPR, is similar to model rocketry with differences that include the propulsion power and weight increase of the model. They use motors in ranges over “G” power and/or weigh more than laws and regulations allow for unrestricted model rockets. Like model rockets, High Power rockets are typically made of safer, non-metallic materials such as cardboard, plastic, and wood, however, construction and recovery techniques usually differ somewhat, due to the requirements imposed by the use of HPR motors. This means that these models must be constructed in such a way that they have the ability to safely fly under these higher stress conditions.
High Power rocket motors cannot be purchased over the counter by the general consumer and typically are not carried by your average hobby store. They can be mail-ordered or purchased at some launch sites by adult modelers who are High Power certified, which is a requirement to purchase and use them. The NAR offers a three level certification program for modelers who want to fly high power rockets. Also, High Power rockets must be flown in compliance with their own separate High Power Rocket Safety Code.
Launching High Power rockets requires more preparation than launching model rockets. Not only is a larger field needed, but FAA clearance must be arranged, well in advance of the launch date. There may also be local or state regulatory issues to be addressed before you can fly your first high power rocket. This is another good reason for joining a NAR Section — many organized clubs already have the personnel and experience in making these tedious arrangements, freeing you to concentrate on the actual flying.