| Tail Number / N-Number | N2129U |
| Manufacturer | BRANTLY |
| Model | B-2 |
| Year Built | 1962 |
| Manufacturer's Serial Number | 177 |
| Aircraft Type | Rotorcraft |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 2 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | LYCOMING |
| Engine Model | O&VO-360 SER |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 180 hp (134 kW) |
| Average Cruising Speed | 75 miles per hour |
| Type of Registrant | Individual |
| Owner Name | MARZICH FRANK M |
| Street | 787 TULIP LANE |
| City | ROCKFORD |
| State | IL |
| Zip Code | 61107 |
| Region | Great Lakes |
| County | Winnebago County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Certificate Issue Date | 1989-01-27 |
| Last Action Date | 2022-08-29 |
| Expiration Date | 2029-10-31 |
| Status | Valid Registration |
| Mode S Code | 50342226 |
| Mode S Code Hex | A1C496 |