| Tail Number / N-Number | N21MH |
| Manufacturer | HEPPERLEN HARRY M III |
| Model | RV-4 |
| Year Built | 1995 |
| Manufacturer's Serial Number | 2670 |
| 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 | 0-360-A1D |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 180 hp (134 kW) |
| Type of Registrant | Individual |
| Owner Name | KANNAPELL JOSEPH H |
| Street | 5323 AIR PARK LOOP W |
| City | GREEN COVE SPRINGS |
| State | FL |
| Zip Code | 32043-8911 |
| Region | Southern |
| County | Clay County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 1996-02-12 |
| Certificate Issue Date | 2019-09-12 |
| Last Action Date | 2022-08-30 |
| Expiration Date | 2029-09-30 |
| Status | Valid Registration |
| Mode S Code | 50334104 |
| Mode S Code Hex | A1B844 |