Has anyone used these??? Picked up a pack out of the "Oldies Box" from local hobby shop.
They're 38mm long, 8.75mm Dia. and have an 8sec burn time. Nozzle exit dia is about 2mm.
From the packet -
Model Rectifier Corporation (MRC) Edison, New Jersey Model Rocket Special Effects Engine.....
FX Engines are a low thrust-long burning dense smoke producing engine that are used to create pre lift-off smoke for added realism.
Igniting FX engines first, your model will sit on the launch pad and billow dense white smoke for as long as 8sec prior to lift-off