| Tail Number / N-Number | N121Y |
| Manufacturer | WITTMAN TAILWIND |
| Model | W-8 |
| Year Built | 1966 |
| Manufacturer's Serial Number | 141 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Not Type Certificated |
| Number of Seats | 1 seat |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | CONT MOTOR |
| Engine Model | 0-200 SERIES |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 100 hp (75 kW) |
| Average Cruising Speed | 112 miles per hour |
| Type of Registrant | Individual |
| Owner Name | SELK GARY B |
| Street | 3601 GOLF RD |
| City | EAU CLAIRE |
| State | WI |
| Zip Code | 54701-9018 |
| Region | Great Lakes |
| County | Eau Claire County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 1979-10-29 |
| Certificate Issue Date | 2002-04-30 |
| Last Action Date | 2022-09-10 |
| Expiration Date | 2030-01-31 |
| Status | Valid Registration |
| Mode S Code | 50054617 |
| Mode S Code Hex | A0598F |