Cessna Citation Hemisphere: Difference between revisions
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The Silvercrest [[axial compressor|axial]]-centrifugal high-pressure compressor architecture is common below {{cvt|7,000|lbf|kN}} but rare in its {{cvt|10,000|-|12,000|lbf}} range, and the pressure losses complexity at the final [[Centrifugal compressor|centrifugal]] stage made it slow to respond to commands in high altitude tests. |
The Silvercrest [[axial compressor|axial]]-centrifugal high-pressure compressor architecture is common below {{cvt|7,000|lbf|kN}} but rare in its {{cvt|10,000|-|12,000|lbf}} range, and the pressure losses complexity at the final [[Centrifugal compressor|centrifugal]] stage made it slow to respond to commands in high altitude tests. |
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This made Dassault cancel its silvercrest-powered [[Falcon 5X]], but the Hemisphere business case depends on it as it could lead to the best [[fuel economy in aircraft|fuel efficiency]] in the segment. |
This made Dassault cancel its silvercrest-powered [[Falcon 5X]], but the Hemisphere business case depends on it as it could lead to the best [[fuel economy in aircraft|fuel efficiency]] in the segment. |
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Textron is confident Safran can resolve the problems before the 2019 [[first flight]].<ref>{{cite news |url= https://www.flightglobal.com/news/articles/fate-of-hemisphere-project-hinges-on-silvercrest-fix-445390/ |title= Fate of Hemisphere project hinges on Silvercrest fix, CEO says |date= 31 |
Textron is confident Safran can resolve the problems before the 2019 [[first flight]].<ref>{{cite news |url= https://www.flightglobal.com/news/articles/fate-of-hemisphere-project-hinges-on-silvercrest-fix-445390/ |title= Fate of Hemisphere project hinges on Silvercrest fix, CEO says |date= 31 January 2018 |author= Stephen Trimble |work= Flightglobal}}</ref> |
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In April 2018, development was suspended to see how Safran manage the Silvercrest problems before a decision on its continuation is made, or to defer it or to switch to another engine.<ref>{{cite news |url= https://www.ainonline.com/aviation-news/business-aviation/2018-04-18/textron-aviation-suspends-citation-hemisphere-program |title= Textron Aviation Suspends Citation Hemisphere Program |author= Mark Huber |date= April 18, 2018 |work= AIN}}</ref> |
In April 2018, development was suspended to see how Safran manage the Silvercrest problems before a decision on its continuation is made, or to defer it or to switch to another engine.<ref>{{cite news |url= https://www.ainonline.com/aviation-news/business-aviation/2018-04-18/textron-aviation-suspends-citation-hemisphere-program |title= Textron Aviation Suspends Citation Hemisphere Program |author= Mark Huber |date= April 18, 2018 |work= AIN}}</ref> |
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Revision as of 04:08, 23 August 2018
| Citation Hemisphere | |
|---|---|
| |
| Role | Corporate Jet |
| National origin | United States |
| Manufacturer | Textron Aviation |
| First flight | 2019 |
| Status | In development |
The Cessna Citation Hemisphere is a 4,500 nautical miles (8,300 km) range business jet project by Cessna, expected to fly in 2019 and announced at the 2015 National Business Aviation Association (NBAA) conference with the widest cabin in its class.[1] It will have a maximum speed of Mach 0.9.[2]
Although the Snecma Silvercrest was originally selected, the process was re-opened to the Pratt & Whitney Canada PW800.[3] The Silvercrest with over 12,000 lbf (53 kN) of thrust was confirmed for the 2016 NBAA Convention, along the selection of Honeywell Primus Epic cockpit and Thales Group fly-by-wire flight control system.[4]
The Silvercrest axial-centrifugal high-pressure compressor architecture is common below 7,000 lbf (31 kN) but rare in its 10,000–12,000 lbf (44,000–53,000 N) range, and the pressure losses complexity at the final centrifugal stage made it slow to respond to commands in high altitude tests. This made Dassault cancel its silvercrest-powered Falcon 5X, but the Hemisphere business case depends on it as it could lead to the best fuel efficiency in the segment. Textron is confident Safran can resolve the problems before the 2019 first flight.[5]
In April 2018, development was suspended to see how Safran manage the Silvercrest problems before a decision on its continuation is made, or to defer it or to switch to another engine.[6] In May 2018, Safran announced it had launched a high-pressure compressor redesign for a go-ahead decision by the middle of 2019, after testing, shelving the Hemisphere program if problems cannot be fixed.[7]
Specifications
Data from Citation Hemisphere[2]
General characteristics
- Capacity: 12 passengers
- Fuselage diameter: 102 inches (260 cm)
- Powerplant: 2 × Snecma Silvercrest turbofans, 12,000 lbf (53 kN) thrust each
Performance
- Cruise speed: 516 kn (594 mph, 956 km/h) mach 0.9
- Range: 4,500 nmi (5,200 mi, 8,300 km)
- Cabin Altitude: 5,000 ft (1,500 m)
See also
Related development
Aircraft of comparable role, configuration, and era
References
- ^ "Cessna showcases new Citation Longitude at NBAA 2015; announces large cabin Citation Hemisphere" (Press release). 16 November 2015.
- ^ a b "Citation Hemisphere". Cessna.
- ^ "A Discussion with Pratt & Whitney Canada President John Saabas". AirInsight. June 9, 2016.
- ^ "Cessna selects engine, avionics and fly-by-wire suppliers for the latest in its large-cabin Citation business jet family" (Press release). Textron Aviation. October 31, 2016.
- ^ Stephen Trimble (31 January 2018). "Fate of Hemisphere project hinges on Silvercrest fix, CEO says". Flightglobal.
- ^ Mark Huber (April 18, 2018). "Textron Aviation Suspends Citation Hemisphere Program". AIN.
- ^ Stephen Trimble (28 May 2018). "Silvercrest compressor redesign underway as Hemisphere awaits decision". Flightglobal.
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