| Tail Number / N-Number | N21WZ |
| Manufacturer | BUSH STEPHEN ROBERT |
| Model | RV-4 |
| Year Built | 2000 |
| Manufacturer's Serial Number | 2637 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Not Type Certificated |
| Number of Seats | 2 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | LYCOMING |
| Engine Model | AEIO-320 SER |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 160 hp (119 kW) |
| Type of Registrant | Individual |
| Owner Name | BUSH STEPHEN ROBERT |
| Street | 8311 COUNTY ROAD 120 |
| City | SALIDA |
| State | CO |
| Zip Code | 81201-9402 |
| Region | Northwest Mountain |
| County | Chaffee County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 2000-11-15 |
| Certificate Issue Date | 2007-08-23 |
| Last Action Date | 2021-01-11 |
| Expiration Date | 2028-01-31 |
| Status | Valid Registration |
| Mode S Code | 50334465 |
| Mode S Code Hex | A1B935 |