rootbrowseIAC-11C4session 88. Advanced Propulsion: "Non Electric Non Chemical”Papers1. Concept for a Modular Solar Sail2. Beamed Energy for Ablative Propulsion in Near Earth Space3. Numerical investigate on the effects of the length of the flat-roofed parabolic nozzle on the multi-pulses laser propulsion4. trajectory optimiztion of ground based laser launch for two launch schemes5. design of a new vehicle propelled by multi-gbls and it's launch schemes6. nanosecond pulsed laser ablation of polytetrafluoroethylene based propellants: numerical analysis of thermal and mechanical events