| Tail Number / N-Number | N4721G |
| Manufacturer | SKYHOPPER |
| Model | II |
| Year Built | 1965 |
| Manufacturer's Serial Number | AR-1 |
| 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 | CONT MOTOR |
| Engine Model | 0-200 SERIES |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 100 hp (75 kW) |
| Average Cruising Speed | 85 miles per hour |
| Type of Registrant | Individual |
| Owner Name | RUTKIEWICZ ADOLPH H |
| Street | 40 RUTKIEWICZ RD |
| City | RAVENA |
| State | NY |
| Zip Code | 12143-2731 |
| Region | Eastern |
| County | Albany County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 1984-07-23 |
| Certificate Issue Date | 1965-09-16 |
| Last Action Date | 2021-01-23 |
| Expiration Date | 2028-06-30 |
| Status | Valid Registration |
| Mode S Code | 51345412 |
| Mode S Code Hex | A5CB0A |