| Tail Number / N-Number | N521RJ |
| Manufacturer | JATHO JIM W |
| Model | RV 4 |
| Manufacturer's Serial Number | 1154 |
| 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 | 0-360-A1D |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 180 hp (134 kW) |
| Type of Registrant | Individual |
| Owner Name | DRAKE RANDALL W |
| Street | 3187 N PRIVATE RD 135E |
| City | SULLIVAN |
| State | IN |
| Zip Code | 47882 |
| Region | Great Lakes |
| County | Sullivan County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 1990-07-18 |
| Certificate Issue Date | 1998-08-07 |
| Last Action Date | 2020-09-09 |
| Expiration Date | 2028-02-29 |
| Status | Valid Registration |
| Mode S Code | 51507045 |
| Mode S Code Hex | A68E25 |