Pegasus 1
(BE53-2) The two prototype engines were demonstrator engines which developed about 9,000 lbf (40 kN) on the test bed.
Neither engine was installed in a P.1127.

Pegasus 2
(BE53-3) Used in the initial P.1127s, 11,500 lbf (51 kN)
Pegasus 3
Used on the P.1127 prototypes, 13,500 lbf (60 kN)
Pegasus 5
(BS.53-5) Used for the Hawker Siddeley Kestrel evaluation aircraft at 15,000 lbf (67 kN)
Pegasus 6
(Mk.101) For initial production Harriers at 19,000 lbf (85 kN), first flown in 1966 and entered service 1969
Pegasus 10
(Mk.102): For updating first Harriers with more power and used for the AV-8A, 20,500 lbf (91 kN), entering service in 1971.

Pegasus 11
(Mk.103) The Pegasus 11 powered the first generation Harriers, the RAF's Hawker Siddeley Harrier GR.3, the USMC AV-8A and later the Royal Navy's Sea Harrier.
The Pegasus 11 produced 21,000 lbf (93 kN) and entered service in 1974.

Pegasus 14
(Mk.104) Navalised version of the Pegasus 11 for the Sea Harrier, same as the 11 but some engine components and castings made from corrosion-resistant materials.

Pegasus 11-21
(Mk.105 / Mk.106) The 11-21 was developed for the second generation Harriers, the USMC AV-8B Harrier II and the BAE Harrier IIs.
The original model provided an extra 450 lbf (2.0 kN).
The RAF Harriers entered service with the 11-21 Mk.105, the AV-8Bs with F402-RR-406.
Depending on time constraints and water injection, between 14,450 lbf (64.3 kN) (max.
continuous at 91% RPM) and 21,550 lbf (95.9 kN) (15 s wet at 107% RPM) of lift is available at sea level (including splay loss at 90°).
The Mk.106 development was produced for the Sea Harrier FA2 upgrade and generates 21,750 lbf (96.7 kN).

Pegasus 11-61
(Mk.107) The 11-61 (aka -408) is the latest and most powerful version of the Pegasus, providing 23,800 lbf (106 kN).
This equates to up to 15 percent more thrust at high ambient temperatures, allowing upgraded Harriers to return to an aircraft carrier without having to dump any unused weapons which along with the reduced maintenance reduces total cost of engine use.
This latest Pegasus is also fitted to the highly effective, radar-equipped AV-8B+.
This version combines the proven advantages of day and night STOVL operations with an advanced radar system and beyond-visual-range missiles.
The RAF/RN was in the process of upgrading its GR7 fleet to GR9 standard, initially through the Joint Upgrade and Maintenance Programme (JUMP) and then through the Harrier Platform Availability Contract (HPAC).
All GR7 aircraft were expected to have been upgraded by April 2010.
Part of this process was the upgrade of the Mk.105 engines to Mk.107 standard.
These aircraft were known as GR7As and GR9As.
Pegasus 1
(BE53-2) The two prototype engines were demonstrator engines which developed about 9,000 lbf (40 kN) on the test bed. Neither engine was installed in a P.1127.
Pegasus 2
(BE53-3) Used in the initial P.1127s, 11,500 lbf (51 kN)
Pegasus 3
Used on the P.1127 prototypes, 13,500 lbf (60 kN)
Pegasus 5
(BS.53-5) Used for the Hawker Siddeley Kestrel evaluation aircraft at 15,000 lbf (67 kN)
Pegasus 6
(Mk.101) For initial production Harriers at 19,000 lbf (85 kN), first flown in 1966 and entered service 1969
Pegasus 10
(Mk.102): For updating first Harriers with more power and used for the AV-8A, 20,500 lbf (91 kN), entering service in 1971.
Pegasus 11
(Mk.103) The Pegasus 11 powered the first generation Harriers, the RAF's Hawker Siddeley Harrier GR.3, the USMC AV-8A and later the Royal Navy's Sea Harrier. The Pegasus 11 produced 21,000 lbf (93 kN) and entered service in 1974.
Pegasus 14
(Mk.104) Navalised version of the Pegasus 11 for the Sea Harrier, same as the 11 but some engine components and castings made from corrosion-resistant materials.
Pegasus 11-21
(Mk.105 / Mk.106) The 11-21 was developed for the second generation Harriers, the USMC AV-8B Harrier II and the BAE Harrier IIs. The original model provided an extra 450 lbf (2.0 kN). The RAF Harriers entered service with the 11-21 Mk.105, the AV-8Bs with F402-RR-406. Depending on time constraints and water injection, between 14,450 lbf (64.3 kN) (max. continuous at 91% RPM) and 21,550 lbf (95.9 kN) (15 s wet at 107% RPM) of lift is available at sea level (including splay loss at 90°). The Mk.106 development was produced for the Sea Harrier FA2 upgrade and generates 21,750 lbf (96.7 kN).
Pegasus 11-61
(Mk.107) The 11-61 (aka -408) is the latest and most powerful version of the Pegasus, providing 23,800 lbf (106 kN). This equates to up to 15 percent more thrust at high ambient temperatures, allowing upgraded Harriers to return to an aircraft carrier without having to dump any unused weapons which along with the reduced maintenance reduces total cost of engine use. This latest Pegasus is also fitted to the highly effective, radar-equipped AV-8B+. This version combines the proven advantages of day and night STOVL operations with an advanced radar system and beyond-visual-range missiles. The RAF/RN was in the process of upgrading its GR7 fleet to GR9 standard, initially through the Joint Upgrade and Maintenance Programme (JUMP) and then through the Harrier Platform Availability Contract (HPAC). All GR7 aircraft were expected to have been upgraded by April 2010. Part of this process was the upgrade of the Mk.105 engines to Mk.107 standard. These aircraft were known as GR7As and GR9As.
Rolls-Royce Pegasus