assembly 38 which upon expansion drives support means 20 in the direction of arrow 40 piston assembly 38 is one form of drive means 28 in fig1 that can be used in the present invention upon expansion of piston assembly 38 the attached missile is given a forward velocity the exact magnitude of the velocity is a function of the pressure used in driving telescoping piston assembly 38 driving telescoping piston assembly 38 is power supply 30 which can in turn be activated or receive power from the aircraft itself in addition to the boost assist mechanism the missile will also require some form of hold back release mechanism 45 which can also serve as sway bracing to firmly anchor the missile to launcher 12 to unlock hold back release mechanism 45 as well as disconnect electrical umbilical 34 and support means 20 from the missile itself a sequencing mechanism 46 and an initiator assembly 48 are connected to the power system to provide proper timing and order of events to launch the missile a cam bearing 50 is mounted on each side of support mechanism 20 and fits into guide groove 52 on each side of support mechanism 20 within launcher 12 guide groove 52 curves upward at the end of the piston stroke such.