This equates to more torque, less propeller RPM, and a quieter running engine. However, four-stroke engines need more maintenance and are harder to adjust. They offer better fuel economy but produce less power for their size. However, the .46 uses more fuel. The .46 also swings a slightly smaller propeller at a higher speed, thus giving higher top speed but less climbing ability.
Most trainers work great with a two-stroke engine.
Every engine needs fuel and a pump to put the fuel into the fuel tank. Engines needs a 1.5-volt battery and a special connector to ignite the glow plug. While this certainly isn't the only way to outfit your tote box, when you visit the flying field, most pilots rely on these same items for their ground support. Servos are the part of the airborne radio system that convey mechanical movement. Each moving part will need a servo to make that part move.