| Tail Number / N-Number | N121MN |
| Manufacturer | NIELSEN MARK C |
| Model | RV-6 |
| Year Built | 1997 |
| Manufacturer's Serial Number | MN-01 |
| 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 | 0-320 SERIES |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 180 hp (134 kW) |
| Type of Registrant | Individual |
| Owner Name | NIELSEN MARK C |
| Street | 2859 CHAR LA MAR DR |
| City | GREEN BAY |
| State | WI |
| Zip Code | 54311-6574 |
| Region | Great Lakes |
| County | Brown County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 1997-03-29 |
| Certificate Issue Date | 1996-12-02 |
| Last Action Date | 2021-08-10 |
| Expiration Date | 2029-01-31 |
| Status | Valid Registration |
| Mode S Code | 50054211 |
| Mode S Code Hex | A05889 |