| Tail Number / N-Number | N3781G |
| Manufacturer | HILLER |
| Model | HH-120 |
| Year Built | 1953 |
| Manufacturer's Serial Number | 534663 |
| Aircraft Type | Rotorcraft |
| Category | Land |
| Builder Certification | Not Type Certificated |
| Number of Seats | 1 seat |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | HILLER |
| Engine Model | 8RJ2B |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 4 hp (3 kW) |
| Average Cruising Speed | 99 miles per hour |
| Type of Registrant | Corporation |
| Owner Name | CLASSIC ROTORS MUSEUM |
| Street | 2690 MONTECITO RD |
| City | RAMONA |
| State | CA |
| Zip Code | 92065-1611 |
| Region | Western-Pacific |
| County | San Diego County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 2004-06-04 |
| Certificate Issue Date | 2004-06-02 |
| Last Action Date | 2022-05-10 |
| Expiration Date | 2027-08-31 |
| Status | Valid Registration |
| Mode S Code | 51052005 |
| Mode S Code Hex | A45405 |