| Tail Number / N-Number | N9421 |
| Manufacturer | HARPER-BOWERS FLY BABY |
| Model | 1A |
| Manufacturer's Serial Number | 67-3 |
| 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 | A&C65 SERIES |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 65 hp (48 kW) |
| Average Cruising Speed | 112 miles per hour |
| Type of Registrant | Individual |
| Owner Name | NOACK TRACY L |
| Street | 1125 W 19TH AVE |
| City | OSHKOSH |
| State | WI |
| Zip Code | 54902-6605 |
| Region | Great Lakes |
| County | Winnebago County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 1978-03-15 |
| Certificate Issue Date | 2017-02-02 |
| Last Action Date | 2023-01-17 |
| Expiration Date | 2030-02-28 |
| Status | Valid Registration |
| Mode S Code | 53213421 |
| Mode S Code Hex | AD1711 |