https://aviationweek.com/mro/aircraft-propulsion/cargo-conversions-alternative-propulsion-boost-turboprop-aftermarket
Cargo Conversions, Alternative Propulsion Boost Turboprop Aftermarket | Aviation Week
Aging fleets, cargo conversions and sustainability initiatives are driving life-extension MRO work for older turboprops.
cargo conversionsalternative propulsionboostturbopropaftermarket
https://www.ainonline.com/news-article/2021-04-26/jetoptera-touts-fluidic-propulsion-system-quieter-more-efficient
Jetoptera Touts Fluidic Propulsion System as Quieter, More Efficient Alternative to Electric Power
The company's own aircraft prototype features a distinctive box-wing design combined with a canard that has already been evaluated in a wind tunnel.