Watch this video about turbo engines on HowStuffWorks. The home-built, self starting GR-5A turboshaft engine is completely constructed from off the shelf items (mostly from eBay), the 8 horsepower engine is like no other turbine. The engine features an electric start, electronic control system, and an internal alternator to generate power to run the engines systems; a propane fuel source, external battery and starter switch is virtually all that is needed to run the GR-5A. See how turbo engines work in this video from Don "RCDon" Giandomenico (www.rcdon.com).