Thanks for all the responses. I would like to clarify some of my thoughts ....... #1 My mention of the balloon was misleading. I don't want a ballon for floating ..... I want a parachute that opens and deploys in one second. It seemed to me that in order for this to happen, the parachute must be opened with gas pressure. #2 I can see that flying between mountains that have not been sussed out ahead of time could be scary. I want to autogiro where the obstacles have all been cataloged. I want to create an autogiro corridor between Denver ( near Denver ) and Pueblo, Colorado . I don't want to fly more than 500 feet off the ground. My understanding of the glide characteristics ( which may be incorrect ) of an autogiro make it possible to pick short landing spaces and do a "flare landing". #3 By adding a second engine perhaps I can reduce failure to a 50% loss of power and the ability to choose a "safe" landing. #4 My intention is to make autogiro with a crash cage that survives 40 mph with 4 point support for the inhabitants plus a seat that is " locked " into the crash cage. I would want to protect for pieces of the autogiro flying around chaotically. #5 I want the autogiro to be able to shift to fixed wing flight in the air ( and back again ) and go from 80 mph ( 129 kph ) in autogiro mode to 140 mph ( 225 kph ). All of this this may be an unattainable dream .... #6 I want a dual ( or triple ) redundant virtual instrument panel , I want GPS terrain maps digitally displayed , I want the rotor and stuff that could fall apart instrumented to a extreme degree. #7 Super dream ...... I want flat packs strapped to the chest and back of the passengers that activate in free fall or manually to create a "fall ball" around the user that slows their descent to the ground and then provides adequate cushioning to stop them safely. Maybe a new sport. Best Gus -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist