The key differences between the Gulfstream G650 and the Gulfstream G650ER primarily revolve around their range capabilities, which are achieved through a software modification rather than physical structural changes.

Here are the key distinctions:

Extended Range (ER) Capability: The Gulfstream G650ER is specifically the Extended Range (ER) Version of the Gulfstream G650.

Fuel Capacity:

    ◦ Gulfstream G650: Standard fuel capacity of 44,200 lb / 6,597 gal (20,049 kg / 24,972 ltr).

    ◦ Gulfstream G650ER: Increased fuel capacity of 48,200 lb / 7,194 gal (21,864 kg / 27,232 ltr).

    ◦ Despite the difference in capacity, both models physically have the same fuel tanks. The G650ER's ability to carry more fuel is due to a software modification that allows the aircraft to take on more fuel.

Maximum Takeoff Weight (MTOW):

    ◦ Gulfstream G650: 99,600 lb / 45,179 kg.

    ◦ Gulfstream G650ER: 103,600 lb / 46,993 kg. This represents a Gross Weight Increase that is 4,000 lbs / 1,814 kg greater than the G650.

Range:

    ◦ Gulfstream G650: 6,959 nm / 12,760 km.

    ◦ Gulfstream G650ER: 7,507 nm / 13,773 km.

    ◦ When flying with full seats, the difference is also notable: G650 has a range of 5,912 nm / 10,949 km, while the G650ER has a range of 6,459 nm / 11,962 km.

Takeoff and Landing Performance:

    ◦ Takeoff Performance SL ISA BFL: G650 is 5,858 ft / 1,736 m, while G650ER is 6,299 ft / 1,920 m.

    ◦ Landing Performance FAA Field Length: G650 is 2,680 ft / 817 m, while G650ER is 2,445 ft / 745 m.

Conversion and Cost:

    ◦ A Gulfstream G650 can be converted into a G650ER through the ASC 014 – GVI Extended Range (G650ER) Modification.

    ◦ This conversion involves software changes and can only be performed by Gulfstream.

    ◦ The overall cost for this conversion is approximately $2,000,000 USD. (at June 2025)

• Certification Status: Despite the enhanced capabilities, the G650ER is not considered a new aircraft model and holds the same certification as a G650.

It is essential to note that several other specifications, including fuselage dimensions, cabin dimensions, typical crew and passenger configurations, pressurization, normal cruise speed, climb rate, ceiling, and engine type (Rolls-Royce BR 725 A1-12 with "On Condition" TBO), remain unchanged between the G650 and G650ER. Both models also feature the Gulfstream PlaneView II (Honeywell Primus Epic II) Avionics Suite, which includes a Head-Up Display (HUD), Synthetic Vision System (SVS), and Enhanced Vision System (EVS).

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