en.wikipedia.org/wiki/CFM_International_RISE
2 corrections found
plans are to achieve a 20% reduction in fuel burn and carbon dioxide emissions compared to similar earlier experimental designs by the two CFM parent companies SAFRAN and GE Aviation (now GE Aerospace), and others.
CFM does not describe the RISE program’s 20% target as an improvement over earlier experimental open-rotor designs. Official CFM, GE Aerospace, and Airbus materials say the target is relative to today’s/current commercial engines, including today’s narrow-body engines and the LEAP family.
Full reasoning
This comparison basis is misstated.
Official descriptions of the RISE program consistently say its fuel-burn / CO2 goal is measured against current engines in service, not against earlier experimental open-rotor concepts from GE, Safran, or others.
Evidence:
- CFM’s own RISE overview says: “Program goals include improving fuel efficiency by more than 20 percent compared to today’s engines.”
- GE Aerospace says the RISE program supports an engine that aims to be “20% more fuel-efficient, with 20% lower carbon emissions, than current commercial engines.”
- Airbus says the RISE engine “aims to reduce fuel consumption and CO2 emissions by 20% compared to today’s narrow-body engines.”
- CFM’s sustainability page is even more specific that next-generation CFM technology could bring “up to a 20% reduction in fuel burn and CO₂ vs. today’s LEAP engine family.”
So the article’s wording is not just imprecise; it changes the benchmark from today’s commercial / LEAP-era engines to older experimental designs, which is a different claim.
4 sources
- RISE Overview - CFM International
Program goals include improving fuel efficiency by more than 20 percent compared to today’s engines, as well as testing technologies for compatibility with alternative fuels.
- 5 Things to Know About the CFM RISE Program | GE Aerospace News
The RISE program is advancing technologies to support a future aircraft engine that aims to be 20% more fuel-efficient, with 20% lower carbon emissions, than current commercial engines.
- Propulsion systems | Airbus
The RISE engine will be flight tested on an Airbus A380 test platform by the end of the decade, and this EU-funded OFELIA project aims to reduce fuel consumption and CO2 emissions by 20% compared to today's narrow-body engines.
- Sustainability - CFM International
Advanced, disruptive technology could bring up to a 20% reduction in fuel burn and CO₂ vs. today’s LEAP engine family.
Boeing X-66A (proposed)
The X-66A demonstrator is not a proposed application for the CFM RISE engine. Boeing selected Pratt & Whitney GTF engines for the X-66A flight demonstrator.
Full reasoning
Listing the Boeing X-66A as an application for CFM RISE is contradicted by the companies involved in the X-66A program.
RTX announced that Boeing selected Pratt & Whitney and Collins for the X-66A, stating that Pratt & Whitney would support Boeing with “Pratt & Whitney GTF™ engines” and that Pratt & Whitney would “work with Boeing to apply GTF engines to the X-66A.”
NASA’s X-66A announcement likewise describes Boeing and NASA building the demonstrator by modifying an MD-90 and replacing its engines, but does not identify CFM RISE as the propulsion choice. The later RTX/Boeing supplier announcement does identify the engine choice, and it is Pratt & Whitney GTF, not CFM RISE.
So the X-66A should not be listed as a proposed application of the RISE engine.
2 sources
- RTX selected by Boeing for X-66A NASA Sustainable Flight Demonstrator Project
Two RTX business units, Pratt & Whitney and Collins Aerospace, will support Boeing with Pratt & Whitney GTF™ engines, and Collins nacelles and engine accessories. ... We'll work with Boeing to apply GTF engines to the X-66A.
- Next Generation Experimental Aircraft Becomes NASA's Newest X-Plane - NASA
To build the X-66A, Boeing will work with NASA to modify an MD-90 aircraft, shortening the fuselage and replacing its wings and engines.