| Tail Number / N-Number | N251RK |
| Manufacturer | KNOWLES JAMES R |
| Model | SONEX |
| Year Built | 2011 |
| Manufacturer's Serial Number | 1071 |
| 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 | AEROCONVER |
| Engine Model | AEROVEE |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 80 hp (60 kW) |
| Kit Manufacturer | SONEX AIRCRAFT LLC |
| Kit Model | SONEX |
| Type of Registrant | Individual |
| Owner Name | END EDWARD G |
| Street | 5409 MONTAVIA LN |
| City | INDIANAPOLIS |
| State | IN |
| Zip Code | 46239-6868 |
| Region | Great Lakes |
| County | Marion County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 2011-07-16 |
| Certificate Issue Date | 2022-01-11 |
| Last Action Date | 2022-01-11 |
| Expiration Date | 2029-01-31 |
| Status | Valid Registration |
| Mode S Code | 50456266 |
| Mode S Code Hex | A25CB6 |