Deregistered Aircraft 1 of 1. This aircraft was previously assigned the N-number N4251Y.
| Tail Number / N-Number | N4251Y |
| Manufacturer | KUKLO ROBERT MICHAEL |
| Model | RK-1 |
| Year Built | 1981 |
| Manufacturer's Serial Number | 1 |
| Aircraft Type | Fixed wing single engine |
| 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 | VOLKSWAGEN |
| Engine Model | CONVERSION |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 36 hp (27 kW) |
| Type of Registrant | Individual |
| Owner Name | KUKLO ROBERT M |
| Street | ROUTE 1 BOX 6C |
| City | BYRON |
| State | CA |
| Zip Code | 94514 |
| Country | US |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 1981-09-08 |
| Certificate Issue Date | 1981-06-04 |
| Last Action Date | 1984-08-15 |
| Last Status | Registration Expired – Pending Cancellation |
| Cancellation Date | 2013-06-07 |
| Mode S Code | 51210304 |
| Mode S Code Hex | A510C4 |