Learjet C-21

The C-21 is a twin-engined jet used for cargo and passenger transport by the U.S.A.F. The civilian version is known as the Model 35. The C-21 and Model 35 can carry eight passengers and 42 cf of cargo. The C-21 can also be configured to carry one litter or five ambulatory patients during medical evacuations.

The aircraft is equipped with autopilot, color weather radar, tactical air navigations systems, and high, very high, and ultra high frequency radios. The aircraft has a crew of two, and can be flown from either cockpit seat. The U.S.A.F. began using the C-21 in April 1984.

The plane burns 210 gallons of jet fuel per hour of routine usage. A full load of fuel costs $2,793.


Subassemblies: Body +4, Wings +2, 2 Engine Pods [Body:R,L], +2, 2 Fuel Pods [Wings:R,L] +1, 3 Retractable wheels +1.

Powertrain: Two 3,500-lb. thrust Turbojets [Pods]; 2,300-kWs advanced battery.

Fuel: 931 gallons jet fuel (Fire 13).

Occupancy: 2 NCS, 7 NPS, 1 CPS.

Cargo: 42 cf.


Armor F RL B T U

All: 3/5 3/5 3/5 3/5 3/5



Body: Autopilot, Medium, Long, and Very Long range radios, Precision Navigation Instruments, Transponder, 10-man Environmental Control.



Size: 48.5'x39.5'x12.25' Payload: 4.1 tons Lwt.: 9.15 tons

Volume: 1,158 cf. Maint.: 29 hours Price: $473,759


HT: 12. HPs: 900 Body, 169 each Wing, 56 each Engine Pod, 30 each Fuel Pod, 100 each Wheel.


aSpeed: 530 aAccel: 8 aDecel: 16 aMR: 4 gSR: 4

Stall Speed: 128 mph. Takeoff Run: 186 yards. Landing Run: 410 yards.

gSpeed: 354 gAccel: 22 gDecel: 10 gMR: 0.25 gSR: 4

Ground Pressure Extremely High. No Off-Road speed.


Design Notes:

Body is 965 cf; Wings are 96.5 cf, Engine Pods are 18 cf each, Fuel Pods are 6 cf each; wheels are 31.8 cf. Structure is Medium, Standard with Very Good Streamlining. Armor is DR 5 Expensive Metal. View is Poor. Mechanical controls. Design loaded weight is 20,986 lbs., which is 12% over the historical value. Actual wing area (253.3 sf) and loaded weight (18,300 lbs.) were used for performance calculations. Design aSpeed was 528 mph. Unit price for a military C-21A was $3.1 million in 1996.

The eighth passenger sits in a jumpseat behind the copilot.



The Model 35 is the civilian version of the C-21A.

The Model 36 is a longer range version, and has 2 fewer passenger seats to accommodate more fuel.


From the Aerodrome for GURPS

2008 by Jim Antonicic