| Tail Number / N-Number | N21QT |
| Manufacturer | HARPER MERLE F |
| Model | SEA HAWKER |
| Manufacturer's Serial Number | 21 |
| 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 | O&VO-360 SER |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 180 hp (134 kW) |
| Type of Registrant | Individual |
| Owner Name | HARPER KEN C |
| Street | 2450 WATERGATE WAY |
| City | KENAI |
| State | AK |
| Zip Code | 99611-8852 |
| Region | Alaskan |
| County | Kenai Peninsula Borough |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 1987-06-20 |
| Certificate Issue Date | 2011-08-29 |
| Last Action Date | 2020-04-11 |
| Expiration Date | 2027-08-31 |
| Status | Valid Registration |
| Mode S Code | 50334231 |
| Mode S Code Hex | A1B899 |