| Tail Number / N-Number | N81DK |
| Manufacturer | KOONS DONALD H |
| Model | CYGNET |
| Year Built | 1981 |
| Manufacturer's Serial Number | 152 |
| 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 | REVMASTER |
| Engine Model | 2100 |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 65 hp (48 kW) |
| Type of Registrant | Individual |
| Owner Name | MCGRATH JOHN P |
| Street | 303 S MAIN ST |
| City | CONCORD |
| State | NH |
| Zip Code | 03301-3452 |
| Region | New England |
| County | Merrimack County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 1982-05-26 |
| Certificate Issue Date | 2017-05-30 |
| Last Action Date | 2023-01-22 |
| Expiration Date | 2027-05-31 |
| Status | Valid Registration |
| Mode S Code | 52603530 |
| Mode S Code Hex | AB0758 |