unducted fan

CFM RISE CFM RISE program fuel efficiency future of aviation jet engine technology open fan open fan engine single-aisle aircraft sustainable aviation

Cleared Direct Aug 17, 2026

The CFM RISE Open Fan, the Unducted Engine With Blades You Can See, and the Bet That the Next Big Jump in Fuel Burn Means Taking the Cowling Off

CFM's RISE open fan engine ditches the cowling to cut fuel burn 20% versus today's LEAP, with flight tests due around 2027-2028.

Vector

Cleared Direct Aug 9, 2026

The Open Fan and CFM's RISE Program, the Unducted Engine Betting That the Next Big Efficiency Jump Comes From Taking the Cowling Off

CFM's RISE open fan engine ditches the cowling to cut fuel burn 20%, reviving a 1980s idea the tools couldn't build until now.

Vector

Cleared Direct Jul 29, 2026

The CFM RISE Open Fan, the Unducted Engine With No Cowl, and the Twenty Percent Fuel Burn Bet That Could Reshape the Single-Aisle Jet

CFM's RISE open fan engine ditches the cowl to chase 20% lower fuel burn on the next single-aisle jet - here's how it works and when it might fly.

Vector