On Monday, January 9, 2017 at 9:10:02 PM UTC-6, Soartech wrote:
http://newatlas.com/vanilla-aircraft...-record/47295/

Very efficent!

Jet-fuel powered but with a large propeller at the back. Could be a Diesel engine driving it. I'm sure there are pistons and gear reductions involved..
Impressive performance, shows you on how little power a clean airframe can sustain altitude.