Comparison of Bell AH-1Z Viper and Sikorsky S-61R [S]ave
| Attribute |  Sikorsky S-61R × |  Bell AH-1Z Viper × |
|---|---|---|
| General | ||
| Manufacturer | Sikorsky Helicopter | Bell Helicopter |
| Model | Sikorsky S-61R | Bell AH-1Z Viper |
| Country | United States | United States |
| Manufactured from (year) | 1959 | 2008 |
| Manufactured to (year) | 1970 | - |
| Type | Military Helicopters | Military Helicopters |
| Icao | S61R | AH1Z |
| Performance | ||
| Engine | 2x General Electric T58-GE-10 | 2x 2 × General Electric T700-GE-401C turboshaft |
| Power, hp (hp) | 1,500 | 1,800 |
| Avionics | - | THALES Avionics TopOwl HMS/D |
| Max cruise speed (km/h) | 265 | 370 |
| Travel range (km) | 1,256 | 685 |
| Fuel economy (km/l) | - | 0.68 |
| Service ceiling (m) | 6,401 | 6,096 |
| Rate of climb (m/sec) | 11.28 | 14.17 |
| Weights | ||
| Max take off weight (kg) | 10,000 | 8,392 |
| Max payload (kg) | 2,948 | 2,614 |
| Fuel tank capacity (l) | 2,585 | 1,561 |
| Dimensions | ||
| Seats | 3 | 2 |
| Cabin height (m) | 1.9 | - |
| Exterior length (m) | 22 | 17.67 |
| Tail height (m) | - | 4.31 |
| Fuselage diameter (m) | 2.8 | 0.83 |
| Wing span (m) | 19 | 14.6 |
| Wing tips | No Winglets | No Winglets |
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