aircraft propulsion

Cleared Direct Oct 13, 2026

The CFM RISE Open Fan Engine, the Unducted Rotor GE Abandoned in the Nineteen Eighties, and the Engineering Bet That Could Rewrite Commercial Aviation Efficiency in the Twenty Thirties

CFM International's RISE program is developing an open fan engine targeting 20% better fuel burn than current turbofans, with entry into service projected for the mid-2030s.

Vector

Cleared Direct Jul 25, 2026

Ampaire, the Parallel Hybrid Retrofit, and the Startup Betting That the First Electric Airplanes Won't Throw Away Their Engines

Ampaire's parallel hybrid retrofit cuts fuel burn 25-50% by keeping the engine and adding an electric boost, betting practical electric flight won't ditch combustion yet.

Vector

Cleared Direct Jul 21, 2026

Hydrogen, Fuel Cells, and the Zero-Emission Airplane That Might Not Run on Batteries at All

How hydrogen fuel cells and combustion could power zero-emission flight - and the weight, volume, and infrastructure hurdles still in the way.

Vector