| Tail Number / N-Number | N121YX |
| Manufacturer | ENGERT LARRY R |
| Model | WAIEX |
| Year Built | 2011 |
| Manufacturer's Serial Number | W0121 |
| 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 | JABIRU |
| Engine Model | 3300 |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 120 hp (90 kW) |
| Kit Manufacturer | SONEX AIRCRAFT LLC |
| Kit Model | WAIEX |
| Type of Registrant | Individual |
| Owner Name | ENGERT LARRY R |
| Street | 7274 N FREEZEOUT CT |
| City | COEUR D ALENE |
| State | ID |
| Zip Code | 83815-9858 |
| Region | Northwest Mountain |
| County | Kootenai County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 2011-10-13 |
| Certificate Issue Date | 2011-04-27 |
| Last Action Date | 2022-11-22 |
| Expiration Date | 2030-04-30 |
| Status | Valid Registration |
| Mode S Code | 50054645 |
| Mode S Code Hex | A059A5 |