Glossary
What is tricycle landing gear?
Landing gear with the third wheel at the nose, ahead of the two main wheels. The center of gravity sits ahead of the mains, so the airplane naturally tracks straight along the ground, which is why nearly every modern trainer is built this way.
Also called Nosewheel gear
That is the whole entry for now. The longer version, with the mechanics and worked examples, is still to be written. See autorotation for how those read once they exist.