| Tail Number / N-Number | N81BJ |
| Manufacturer | JANZEN JAMES |
| Model | RV 4 |
| Year Built | 1989 |
| Manufacturer's Serial Number | 978 |
| 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 | O&VO-360 SER |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 180 hp (134 kW) |
| Type of Registrant | Individual |
| Owner Name | BUDAHN CHRISTOPHER W |
| Street | 6525 COUNTY 30 BLVD |
| City | KENYON |
| State | MN |
| Zip Code | 55946-3701 |
| Region | Great Lakes |
| County | Goodhue County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 2022-05-17 |
| Certificate Issue Date | 2021-04-05 |
| Last Action Date | 2021-04-05 |
| Expiration Date | 2028-04-30 |
| Status | Valid Registration |
| Mode S Code | 52603445 |
| Mode S Code Hex | AB0725 |