| Tail Number / N-Number | N721JK |
| Manufacturer | KITZ JOHN |
| Model | RV-4 |
| Year Built | 1996 |
| Manufacturer's Serial Number | 164 |
| 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 | 0-320 SERIES |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 180 hp (134 kW) |
| Type of Registrant | Individual |
| Owner Name | MCDANIEL HARDEY I |
| Street | 4677 S 700 E |
| City | MARION |
| State | IN |
| Zip Code | 46953-9752 |
| Region | Great Lakes |
| County | Grant County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 1996-09-24 |
| Certificate Issue Date | 2017-09-22 |
| Last Action Date | 2020-04-12 |
| Expiration Date | 2027-09-30 |
| Status | Valid Registration |
| Mode S Code | 52324025 |
| Mode S Code Hex | A9A815 |