If you do a search for model rocket electronic payload, you will see a lot of entries for medium to high power, large diameter rockets. These types of rockets are large, typically 80mm (3.1 inches) in diameter or larger. These rockets are flown in large open areas, often deserts and dry lake beds. These larger rockets also use larger propellants, typically in the High Power Rocketry (HPR) range of “H” and above impulse level. Not only do these motors require you to be certified in HPR, the...