>As an aside, note that one can achieve very close to zero g flight within a >gravitational field by flying an approximately parabolic flight path. This >is done with large jet transports for astronaut training. As far as the >airplane is concerned, this is very much the same as flying within a large >satellite that is orbiting the earth, at least for a short period of time >when the airplane is at the top of the parabola. Zero g's is experienced as soon as NASA's "vomit comit" (707 jet) starts the parabolic path, not just at the top. About 20 or more seconds of zero g's during each cycle. Flights last 2 hours regardless of how many "victims" get sick. Employees at Johnson space center can go along for the ride room permitting, but demand is low knowing that it's a 2 hour session. RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]