Thermal gravimetric analysis(TGA), FTIR, Limited oxygen index(LOI) and vertical firing test are used to research the flame retardancy of the intumescent flame retardant on PP.

Easy to tune for vertical arrow flight, (porpoising) can be accomplished without even firing one arrow.

Aim A new scheme of vertical launching system was presented to solve the problems of combustion gas exhaust and protection, guarding against unexpected firing and so on.