I've never made anything quite like what the "Big-Boys" fly, but some of the solids I've flown had inexplicable catastropic-failures. (Inexplicable at the time) Later I'd found the stored motors were developing cracks in the fuel-grain, leading to severe over-pressures shortly after ignition. 15 to 20 ft flight, then kaboom.
Register for free to join our community of investors and share your ideas. You will also get access to streaming quotes, interactive charts, trades, portfolio, live options flow and more tools.