There have been some rumored demands for a piston engine ground attack aircraft, why can't air forces upgrade older planes to match the Super Tucano? - Quora
More environmentally friendly fuels approved for Cessna piston-powered aircraft - Asian Aviation
Piston-powered aircraft from the 1950s were as fuel-efficient as the current average jet | LOW←TECH MAGAZINE
How It Works: Piston Engine - AOPA
World's Fastest Four-Engine Piston-Powered Aircraft: Story of the Republic XR-12 9781580071635 | eBay
Close Up View Of Airplane Biplane With Piston Engine And Propeller On A Cloudy Sky Background Stock Photo, Picture and Royalty Free Image. Image 94718062.
How to Care for a Piston Engine Aircraft - Aviation Oil Outlet