| Tail Number / N-Number | N687HR |
| Manufacturer | CRAIG A COOK |
| Model | HARMON ROCKET II |
| Year Built | 2020 |
| Manufacturer's Serial Number | 227 |
| 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 | LYCOMING |
| Engine Model | IO 540 SER |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 260 hp (194 kW) |
| Kit Manufacturer | HARMON ROCKET LLC |
| Kit Model | HARMON ROCKET II |
| Type of Registrant | Individual |
| Owner Name | COOK CRAIG A |
| Street | 235 LADERA WAY |
| City | OCEANSIDE |
| State | CA |
| Zip Code | 92054-4526 |
| Region | Western-Pacific |
| County | San Diego County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 2020-12-26 |
| Certificate Issue Date | 2020-10-26 |
| Last Action Date | 2020-10-26 |
| Expiration Date | 2027-10-31 |
| Status | Valid Registration |
| Mode S Code | 52216767 |
| Mode S Code Hex | A91DF7 |