- Aug 8, 2009
Or you could use a 100 foot extension cord to get up and away to a reasonable altitude and airspeed and avoid the high power VTO battery drain. The VL can be much less power hungry and is not as severe operating condition. A good landing gear might absorb a landing thrust deficiency as well as a non vertical landing particularly in an engine out situtation.I think as tempting as a IC-hybrid style power system seems, it does have a bundle of its own complexities and compromises. For starters you've just upped the complexity by at least a factor of two. You need to add significant cooling systems (and drag) into the equation (unless you go turbine, perhaps). More significantly you need to carry at least twice the weight in electrical machines than you do for a battery only solution and you need to deal with engine noise, vibration isolation and heat management, fuel systems and pumps. None of this is new news but it all adds to the plates you're already spinning to get a design together. Oh, and you'll need to carry some (high-power density = heavy and expensive) batteries anyway...
Generally not as cut-and-dried a decision as you might think.