Gulfstream G450: specifications, range, cabin

The G450 is a large business jet with 8,056 km of range, a three-zone cabin and the G550 flight deck. It stayed in production for fourteen years, and together with the G350 a total of 365 aircraft were delivered. Here I go through the published figures and how they behave in service: how far the aircraft actually carries a full load, how it differs from the Gulfstream IV it grew out of, and what to check on a specific airframe.

Key specifications

Manufacturer and type-catalogue data. The figures for a specific aircraft come from its flight manual: equipment and modifications change the weights, and the range along with them.

Full specifications and selection — on the model page.

Where the G450 came from

The basis is the Gulfstream IV-SP, an aircraft of 1993. Gulfstream stretched the fuselage by 30 centimetres, fitted the nose section and flight deck from the G550, and replaced the engines with the upgraded Tay 611-8C. FAA certification came on 12 August 2004, deliveries started in 2005.

That approach gave a rare combination: an airframe proven on hundreds of aircraft over fifteen years, and a next-generation flight deck. This is exactly why the series lasted fourteen years and ended only when the all-new G500 arrived. The last G450 was handed over to its customer on 19 January 2018.

For a buyer on the pre-owned market this means predictability. Decades of statistics have accumulated on the GIV family airframe, the Gulfstream service network operates on every continent, and there is no shortage of specialists on the type.

Range: what sits behind the 4,350 miles

The published 4,350 nautical miles is a calculated figure. Behind it stands a fixed set of conditions: payload, cruise Mach number and the fuel reserve scheme. The calculation conditions for a specific aircraft are written into its flight manual, and that is what the number in a listing gets checked against.

What reduces the figure in service:

Speed. The M 0.80–0.85 band is a crew choice on every flight. The upper limit takes away part of the range.

Payload. A cabin filled with 14–16 people and their baggage costs hundreds of kilometres against the calculated payload.

Wind. Headwinds on east–west routes eat 5 to 15 percent depending on the season and the flight level.

Departure airport. A short runway, heat or elevation limits the take-off weight, and the fuel load with it.

A leg near the limit of the published range is planned with a tech stop or a reduced payload.

What the aircraft covers with confidence: Moscow–Dubai, Moscow–London, London–New York, Moscow–Delhi, European and Middle East routes in full. Westbound transatlantic in winter is calculated on the actual wind and payload.

The Pacific and routes from Europe into Southeast Asia are a different class already. For those you go to the G550 with its 12,501 km.

Cabin

Three living zones: a club group of seats, a conference zone with a table or a dining group, and a divan area in the aft section. A full galley, one or two lavatories. VIP layouts were built to order, so two aircraft of the same production year can be arranged differently.

Exact cabin dimensions come from the documentation of the specific aircraft: the layout was made to order, and a reference figure for the type says little here.

The typical layout is 14–16 seats, with a maximum of 19. What that number means in practice: 19 seats are fitted for group transport tasks, and at that payload the range is noticeably below the published one.

On an eight- to nine-hour leg the three zones work like this: the forward group for meetings and work, the middle one for meals, the aft one for rest. It is precisely this set of zones that separates the large class from the super-midsize, where passengers on a long leg sit in a single space.

The baggage compartment is accessible in flight — a common feature of the Gulfstream family and a noticeable advantage on routes with a stopover a day later.

Tay 611-8C engines

Two Rolls-Royce Tay 611-8C of 13,850 lb thrust each. The Tay family is fitted across the whole GIV family, the installed base is large, and the lives and removal costs are known to the market.

This is also where the main financial feature of the type sits. Removal and overhaul of a pair of Tay 611-8s outside an hourly cost programme runs $2–3 million, from what I see. That is comparable to the price of an entire previous-generation aircraft. So on a G450 the engine programme status is the first thing checked, and it affects the deal price more strongly than any other item.

More on the cost structure — in the breakdown of private jet ownership costs.

Ceiling and flight deck

The service ceiling is 45,000 feet. Six thousand feet lower than the G550, and it is felt on long legs: part of the weather has to be flown around, and the flight levels on popular routes are more crowded.

The PlaneView flight deck with four large displays came over from the G550 in full. The EVS enhanced vision system with its infrared camera puts the picture on a head-up display: on a night or fog approach this lowers the chance of a diversion to an alternate airport.

For an aircraft designed in the early 2000s the avionics fit looks current. Even so, the specific aircraft has to be checked: communication and surveillance requirements in different airspaces changed several times over the service life of the type, and some aircraft were upgraded while others were not.

G450, G350 and Gulfstream IV: what gets confused in listings

Gulfstream IV and IV-SP — the predecessors, the same airframe by geometry and the same 8,056 km of range, with a previous-generation flight deck without PlaneView and EVS. From what I see, the pre-owned market holds them in a $2.8–5.5 million band with a median around $4 million, while the G450 starts at $8.5 million. The difference in money is the avionics, the age of the airframe and the remaining lives.

G300 and G400 — designations for the GIV-SP after the 2002 rebranding. The G400 was built until 2004. It has nothing to do with the GIV-X, although the number "400" next to "450" confuses buyers regularly.

G350 — the same planform as the G450, with a reduced fuel capacity and a simplified specification. Range around 3,800 nautical miles, no EVS as standard. Built in a small series, rarely seen on the market.

G450 — the main production version of the GIV-X: 4,350 nautical miles, PlaneView, EVS.

The type is verified against the aircraft records. A Gulfstream IV-SP presented in a listing as "a G450 on paper" is an ordinary story on the pre-owned market.

What to check on a specific aircraft

Airframe time in hours and in cycles, separately. The remaining time on each engine to its next removal. The status of the hourly cost programme on the engines and on the auxiliary power unit. The calendar checks already done and the next one due. The avionics fit and the scope of upgrades for the airspaces where the aircraft will fly. The year of the last cabin refurbishment. The previous operating pattern: government and corporate aircraft flew different numbers of hours and kept their records differently.

Every item turns into money: either a discount off the price or a first-year ownership budget.

I have run deals on the Bombardier Global and the Embraer Legacy myself. From what I see, keeping an aircraft of this class costs 10 to 20 percent of its value a year: crew, pilot training, the operator, parking, fuel. When a client's route network does not call for this class, I talk them out of the purchase.

What the type itself costs and what it costs to keep — in the breakdown of Gulfstream G450 prices.

The figures here are a guide. The specifics are calculated from the documents of the specific aircraft.

Alexander Filimonov — business aviation: aircraft selection, purchase and entry into service.

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