End Burner: An end burner is a type of motor that when lit the rocket launches with a low amount of thrust. As the fuel burns, pressure starts to build in the chamber. The pressure builds because it has a small nozzle and a short core. It has the most amount of thrust at the burnout of the motor.
Core Burner: A core burner has a core that burns outward equally from all sides. When lit it has an equal amount of thrust because of the fuel having an equal burn in all directions.
Black Powder Rocket Fuel: The most commonly used small model rocket engines are the black powder engines. These are the "traditional" model rocket engines that have been in production since the 50's. Black powder model rocket engines are made of a paper tube with a clay nozzle, a solid pellet of black powder propellant, a smoke/delay charge, and an ejection charge.
R-Candy Rocket Fuel: R- candy is a type of rocket fuel that is made up of potassium nitrate and common white sugar. Rocket candy is called such because of its sugar content and appearance of caramel. The sugar acts as the fuel and the potassium is the oxidizer.