| Tail Number / N-Number | N21SW |
| Manufacturer | WITRY STEVEN ROY |
| Model | PITTS S1E |
| Manufacturer's Serial Number | 8-0107 |
| 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 | LYCOMING |
| Engine Model | AEIO-360 SER |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 180 hp (134 kW) |
| Type of Registrant | Individual |
| Owner Name | PENSENSTADLER MARK A |
| Street | 15076 LINDBERGH CT |
| City | LINDEN |
| State | MI |
| Zip Code | 48451-9054 |
| Region | Great Lakes |
| County | Genesee County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 1990-10-05 |
| Certificate Issue Date | 2021-10-26 |
| Last Action Date | 2021-10-26 |
| Expiration Date | 2028-10-31 |
| Status | Valid Registration |
| Mode S Code | 50334316 |
| Mode S Code Hex | A1B8CE |