Cessna Citation X Warning: You are not logged in. Your IP address will be publicly visible if you make any edits. If you log in or create an account, your edits will be attributed to your username, along with other benefits.Anti-spam check. Do not fill this in! ==Design== [[File:Queensland Nickel Pty Ltd (VP-CFP) Cessna 750 Citation X in the Douglas Aerospace hangar 2.jpg|thumb|Unpainted airframe showing metal construction]] {{Refimprove|date=March 2023}} The Citation X uses a new wing, tail, tail cone, landing gear, and systems, designed from scratch and not based on prior Citations. Part commonality is limited to some cockpit controls, the windshield, and the tail light bulb.<ref>{{cite web |last1=ReadyJetGo |title=Cessna Citation X |url=https://readyjetgo.medium.com/cessna-citation-x-private-jet-faf85e702c3 |website=Medium |date=31 October 2019 |access-date=3 March 2023}}</ref> The pressure bulkhead is also similar to previous designs. The Citation X has the same fuselage cross-section as the Citations III, VI and VII; however, the wing attachment to the fuselage is different from the attachment in previous Citation. The Citation X was the first aircraft from Cessna to use a Rolls-Royce engine and fully-integrated avionics.<ref>{{Cite web|url=https://cessna.txtav.com/en/citation/xls|title = Citation XLS+}}</ref> The aircraft incorporates a number of innovative design features. One attribute that is often first noticed is the large diameter of the engine intakes. This feature, related to the high [[bypass ratio]] turbofan, reduces the noise from the engines and improves [[fuel efficiency]]. Another obvious characteristic is the highly [[swept wing]] with a [[supercritical airfoil]], used in order to increase the [[critical Mach number]] and therefore the top speed. The Citation X has 37 degrees of [[sweepback]] at the quarter chord, more than any other business jet and, among civil aircraft, second only to the [[Boeing 747]]'s 37.5 degrees. The horizontal and vertical stabilizers are also highly swept and are arranged in a T-tail configuration. ===Airframe=== [[File:Cessna 750 Citation X AN0983363.jpg|thumb|The [[area rule]]d fuselage]] A significant amount of effort throughout the design process was directed towards reducing the Citation X's total drag. The resulting design includes an [[area rule|area-ruled]] fuselage for efficient [[transonic]] flight and a highly swept [[supercritical wing]]. The Citation X's wing is slung below the fuselage rather than passing through it. This allows increased volume in the fuselage, a one-piece wing, and simplified wing-fuselage connections. ===Engines=== [[File:AE 3007engine1.JPG|thumb|[[Rolls-Royce AE 3007]] turbofan]] The Citation X is powered by two [[Rolls-Royce AE 3007]]C (up to S/N 750-172) or AE 3007C1 engines (S/N 750-173 and subsequent), each with 6442 lbs (28.66 kN) or 6764 lbs (30.09 kN)<ref>{{cite book|last=Cessna|title=Model 750 Pilot's Operating Handbook|publisher=Cessna Aircraft Company|location=Wichita, KS}}</ref> of thrust, respectively. They are pod-mounted on the sides of the rear fuselage. It is the first Cessna aircraft to be powered by a Rolls-Royce engine. The engine has solid [[titanium]] blades and a three-stage low-pressure turbine. The engine's fan has approximately a 5 to 1 bypass ratio for improved fuel efficiency and low acoustic signature. The unit also incorporates the Honeywell GTCP36-150CX Auxiliary Power Unit (APU). ===Powered controls=== Another first for Cessna is the inclusion of powered controls in the Citation X. The controls are powered by dual-hydraulic systems for redundancy. There are two elevators and the tailplane is all-moving for trim. The rudder is in two pieces: the lower portion is hydraulically powered and the upper portion is electrically powered. Each wing has five spoiler panels, to be used both for roll control (in addition to the ailerons) and as speed brakes. One of the major challenges of the Citation X design was finding enough space in the wing to run all the necessary hydraulic lines. As Paul Kalberer, the chief engineer of the Citation X program, explained, the Citation X needs just as many hydraulic pumps and actuators as a large airliner, but has much less space inside the wings. ===Avionics=== [[File:The front office of the Citation X (5100778418).jpg|thumb|Cockpit]] [[Honeywell]] provides the avionics system for the [[glass cockpit]]. The [[Honeywell Primus]] 2000 [[EFIS]] flight director system is composed of five 7-inch Γ 8-inch CRT screens. Dual flight management systems with [[GPS]] are standard. In the Citation X+ the avionics were changed to the Garmin G5000 system.<ref name=xplus-pilot-report /> ===Elliptical winglets=== In 2008, [[Winglet Technology]], with the help of Cessna, began flight testing epoxy/graphite elliptical [[winglets]] on a Citation X. Flight testing was nearing completion in late 2008, with FAA [[supplemental type certificate|supplemental type certification]] expected in 2009. The winglets increase range by 150 nm, lower fuel burn by 4β5%, improve hot and high performance as well as climb rate, permitting a climb to [[flight level]] 430 in 22 minutes, as opposed to 26 minutes without the modification. Climb to flight level 450 at maximum takeoff weight is possible without a [[step climb]].<ref>{{cite news|title=Winglet Technology Nearing Completion of Cessna Citation X Elliptical Winglet Flight Testing |url=http://www.skycontrol.net/industry/winglet-technology-nearing-completion-of-cessna-citation-x-elliptical-winglet-flight-testing/ |url-status=dead |access-date=22 June 2009 |publisher=Sky Control |date=5 October 2008 |archive-url=https://web.archive.org/web/20081009045721/http://www.skycontrol.net/industry/winglet-technology-nearing-completion-of-cessna-citation-x-elliptical-winglet-flight-testing/ |archive-date=2008-10-09 |location=Orlando, FL }}</ref> Cruise speed at altitude is expected to increase by 15 knots, and maximum takeoff weight will increase by 1200 lbs (545 kg). Excluding installation, the kit's projected cost is $395,000.<ref>{{cite news|last1=Croft|first1=John|title=New winglet manufacturer excels on Citation X|url=https://www.flightglobal.com/news/articles/new-winglet-manufacturer-excels-on-citation-x-317202/|access-date=22 June 2009|publisher=[[Flightglobal]]|date=10 October 2008|location=Washington DC}}</ref> Elliptical winglets were made standard on Citation X+.<ref name=xplus-pilot-report>{{cite web|url= https://www.ainonline.com/aviation-news/business-aviation/2014-11-01/citation-x-pilot-report |title= Citation X+ Pilot Report}}</ref> Summary: Please note that all contributions to Christianpedia may be edited, altered, or removed by other contributors. If you do not want your writing to be edited mercilessly, then do not submit it here. You are also promising us that you wrote this yourself, or copied it from a public domain or similar free resource (see Christianpedia:Copyrights for details). 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