If you can ignore the over-the-top music on this video from Top Flight, the MIT spin-off company has some very interesting power technology that can get 100 mile range of one gallon of gas. More details in this Technology Review article.
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Getting back to inboard generator, here's what SULLIVAN (RC Starters and accs.) if offering since 2013.
http://www.sullivanuv.com/images/products/NEW/alternators/S676-500D...
This is one of the compatible engines....Looks familiar ?
Just add a fan cooling assembly and a voltage regulator and you get 2800 Watts under 5 pounds (dry).
those liquid piston engines are awesome
Very cool, the 95% efficient generator and a light weight engine design like the Wankel are probably just what you need to make this work.
It looks like a Wankel type engine like LiquidPiston is developping:
http://liquidpiston.com/technology/x-mini-gasoline/
Connected to a Hallback Array type of motor-generator
http://www.launchpnt.com/portfolio/aerospace/electric-machines-for-...
afaik hydrogen fuel cells are not really off the shelf. After a few use lots of parts need to be replaced.
Complete coverage of DEMO, New Tech Solving Big Problems, can be found at bit.ly/DEMOsite. Photo by Stephen Brashear (www.stephenbrashear.com)