| Tail Number / N-Number | N21DV |
| Manufacturer | VIHLEN |
| Model | PITTS SPECIAL S-1S |
| Year Built | 1977 |
| Manufacturer's Serial Number | 7-0335 |
| 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 | I0360 SER |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 180 hp (134 kW) |
| Type of Registrant | Individual |
| Owner Name | HILL JACK C |
| Street | 102 JUANITA LN |
| City | ARNOLD |
| State | MO |
| Zip Code | 63010-3811 |
| Region | Central |
| County | Jefferson County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 1980-08-05 |
| Certificate Issue Date | 2020-02-26 |
| Last Action Date | 2023-01-22 |
| Expiration Date | 2027-02-28 |
| Status | Valid Registration |
| Mode S Code | 50333610 |
| Mode S Code Hex | A1B788 |