Hi All ! I'm changing my engine, it's in thread : https://www.homemodelenginemachinist.com/threads/glow-engine.30315/page-4 with the ignition unit I have a question : With the model engines ( flamer eater, stirling, internal combustion ...) how to determine the size, diameter, weight ..of flywheel . to ensure the necessary inertia? or just based on experience and many experiments? Thanks for reply !