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| Manufacturer | Boeing |
| Model | Boeing Model 21 (NB) |
| Modification | Model 21 (NB-1) |
| Country | USA |
| Years | 19 |
| Type | Other |
| Main rotor diameter | - |
| Tail rotor diameter | - |
| Wingspan | 11.23 m |
| Length | 8.76 m |
| Height | 3.56 m |
| Wing area | 31.96 m2 |
| Zero fuel weight | - |
| Empty weight | 969 kg |
| Maximum takeoff weight | 1287 kg |
| Normal takeoff weight | - |
| Flight duration | - |
| Engine | 1 Lawrance J-1 |
| Power | 1 x 200 HP |
| Thrust | - |
| Maximum speed | 160 km/h |
| Cruising speed | 145 km/h |
| Rate of climb | - |
| Practical range | 483 km |
| Service ceiling | 3110 m |
| Hovering ceiling | - |
| Crew | 2 |
