| Tail Number / N-Number | N521R |
| Manufacturer | VICKERS |
| Model | SPITFIRE MARK IX |
| Year Built | 1943 |
| Manufacturer's Serial Number | CBAF-1X-1886 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 1 seat |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | ROLLS-ROYC |
| Engine Model | MERLIN |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 1,760 hp (1,313 kW) |
| Average Cruising Speed | 262 miles per hour |
| Type of Registrant | Corporation |
| Owner Name | APEX FOUNDATION |
| Street | PO BOX 245 |
| City | BELLEVUE |
| State | WA |
| Zip Code | 98009-0245 |
| Region | Northwest Mountain |
| County | King County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 1990-04-06 |
| Certificate Issue Date | 2001-12-12 |
| Last Action Date | 2022-07-18 |
| Expiration Date | 2029-08-31 |
| Status | Valid Registration |
| Mode S Code | 51507034 |
| Mode S Code Hex | A68E1C |