| Tail Number / N-Number | N191S |
| Manufacturer | SISLER |
| Model | CYGNET SF-2A |
| Year Built | 1977 |
| Manufacturer's Serial Number | 112 |
| 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 | VOLKSWAGEN |
| Engine Model | CONVERSION |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 36 hp (27 kW) |
| Average Cruising Speed | 85 miles per hour |
| Type of Registrant | LLC |
| Owner Name | VIKING AIRCRAFT LLC |
| Street | PO BOX 646 |
| City | ELKHORN |
| State | WI |
| Zip Code | 53121-0646 |
| Region | Great Lakes |
| County | Walworth County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 1979-05-19 |
| Certificate Issue Date | 2016-01-26 |
| Last Action Date | 2021-08-13 |
| Expiration Date | 2029-01-31 |
| Status | Valid Registration |
| Mode S Code | 50266562 |
| Mode S Code Hex | A16D72 |