| Tail Number / N-Number | N85BU |
| Manufacturer | DORNIER |
| Model | BU 133 |
| Year Built | 1940 |
| Manufacturer's Serial Number | 32 |
| 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 | SIEMENS |
| Engine Model | SH14 |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 113 hp (84 kW) |
| Average Cruising Speed | 114 miles per hour |
| Type of Registrant | Individual |
| Owner Name | MARTIN JAMES D |
| Street | 3279 LAVILLA RD |
| City | GRAFORD |
| State | TX |
| Zip Code | 76449-4559 |
| Region | Southwestern |
| County | Palo Pinto County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 2002-01-11 |
| Certificate Issue Date | 2020-02-18 |
| Last Action Date | 2022-09-29 |
| Expiration Date | 2030-02-28 |
| Status | Valid Registration |
| Mode S Code | 52722453 |
| Mode S Code Hex | ABA52B |