| ENGINE | |
| MODEL NUMBER | 250-C47B |
| MANUFACTURER | Allison Gas Engine Co |
| TORQUE / HORSEPOWER | |
| Maximum continuous power | 93.5 % torque/630 shaft
horsepower |
| Takeoff power (5 minute limit) | 100 % torque/674 shaft horsepower |
| AIRSPEED LIMITATIONS (INDICATED) | |
| Maximum airspeed Vne | 140 knots |
| Maximum airspeed for Autorotation
| 100 knots |
| Maximum airspeed at 93.5 to
100% torque | 100 knots |
| Maximum
airspeed with doors off | 100 knots |
| RECOMMENDED AIRSPEEDS (INDICATED) | |
| Minimum rate of decent | 55 knots in autorotation |
| Maximum glide
distance | 80 knots in autorotation |
| Hydraulic
failure | 70 – 100 knots |
| Best rate of climb | 60 knots |
| ALTITUDE | |
| Maximum altitude at 5,000 pounds (2268 kilograms) GW |
20,000 feet Hp (Pressure Altitude) |
| Maximum altitude above 5,000 pounds (2268
kilograms) GW | 10,000 feet Hd (Density Altitude) |
| WEIGHTS | |
| Average empty weight | 2,870 pounds |
| Maximum gross weight (internal) | 5,000
pounds |
| Maximum gross weight (external) | 5,500 pounds |
| Cargo hook rated capacity | 2,650 pounds (maximum) |
| FUELS | |
| Maximum capacity w/o Aux. Tanks | 128.8 U.S. gallons (490
liters) |
| ASTM type Jet B (JP-4) | All
temperatures |
| ASTM type Jet A or A-1 (JP-5) | -25 F (-32 C) |
| APPROVED LUBRICANTS | |
| Engine and power train gear case oils must conform to MIL-L-7808, MIL-L-23699, or
DOD-L-85734(AS) 555 series specification. |
| Hydraulic fluid | MIL-H-5606
1 pint in system
I
pint in reservoir |
| MAIN ROTOR | |
| Number of blades | 4 |
| Diameter | 35 feet |
| Chord | 10.04 inches |
| Twist | -13 degrees |
| Engine to main rotor gear ratio | 15.23 to 1 |
| RPM at 100% | 413 |
| TAIL ROTOR | |
| Number of blades | 2 |
| Diameter | 65 inches |
| Chord | 6.40 inches |
| Twist | 0 degrees |
| Engine to main rotor gear ratio | 2.53 to 1 |
| RPM at 100% | 2497 |
| AIRFRAME | |
| Overall length | 41 feet 8.5 inches |
| Overall height | 10 feet 3.8 inches |
| PASSENGER/CARGO DOOR OPENING | |
| Height | 39 inches |
| Width | 36 inches |
| Ambulance | + 25 inches |
| CARGO AREA VOLUME | |
| Main cargo area | 85 cubic feet |
| Baggage compartment | 16 cubic feet |
Niagara
Helicopters Limited
