| Tail Number / N-Number | N641RM |
| Manufacturer | KOSCO MARK J |
| Model | KOSCO RV-6 |
| Year Built | 2003 |
| Manufacturer's Serial Number | 23127 |
| 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) |
| Kit Manufacturer | VANS AIRCRAFT INC |
| Kit Model | RV-6 |
| Type of Registrant | Individual |
| Owner Name | KWIECINSKI WIT W |
| Street | 70 W HURON ST APT 1105 |
| City | CHICAGO |
| State | IL |
| Zip Code | 60654-3844 |
| Region | Great Lakes |
| County | Cook County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 2003-11-07 |
| Certificate Issue Date | 2019-09-06 |
| Last Action Date | 2022-05-02 |
| Expiration Date | 2029-09-30 |
| Status | Valid Registration |
| Mode S Code | 52065165 |
| Mode S Code Hex | A86A75 |