Man Builds See-Thru Rocket
Ben Kransow builds a unique rocket engine in his workshop. This rocket engine is a hybrid that uses solid fuel (acrylic) as well as oxygen gas. The clear body allows you to see the combustion take place, as well as the changes that occur when the throttle is changed. Another feature of the hybrid rocket engine is that you can decrease the throttle or turn off the engine if desired, versus a solid fuel rocket that will continue to burn once lit until no more fuel is present.
Via Reddit
