| Tail Number / N-Number | N145WM |
| Manufacturer | WILLIAMS |
| Model | MONOCOUPE 90C |
| Year Built | 1976 |
| Manufacturer's Serial Number | W-1 |
| 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 | CONT MOTOR |
| Engine Model | 0-300 SER |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 145 hp (108 kW) |
| Average Cruising Speed | 85 miles per hour |
| Type of Registrant | Individual |
| Owner Name | GWYN KENNETH R |
| Street | 157 BROKEN BRANCH TRL |
| City | MOUNT AIRY |
| State | NC |
| Zip Code | 27030-7284 |
| Region | Eastern |
| County | Surry County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 1979-11-27 |
| Certificate Issue Date | 2021-11-04 |
| Last Action Date | 2021-11-04 |
| Expiration Date | 2028-11-30 |
| Status | Valid Registration |
| Mode S Code | 50133503 |
| Mode S Code Hex | A0B743 |