| Tail Number / N-Number | N21561 |
| Manufacturer | PIPER |
| Model | J3P |
| Year Built | 1938 |
| Manufacturer's Serial Number | 2474 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 2 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | LENAPE |
| Engine Model | AR3-160 |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 50 hp (37 kW) |
| Average Cruising Speed | 67 miles per hour |
| Type of Registrant | Corporation |
| Owner Name | WESTERN ANTIQUE AEROPLANE & AUTOMOBILE MUSEUM |
| Street | 1600 AIR MUSEUM RD |
| City | HOOD RIVER |
| State | OR |
| Zip Code | 97031-9800 |
| Region | Northwest Mountain |
| County | Hood River County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1964-08-24 |
| Certificate Issue Date | 2012-08-01 |
| Last Action Date | 2021-04-28 |
| Expiration Date | 2028-08-31 |
| Status | Valid Registration |
| Mode S Code | 50347531 |
| Mode S Code Hex | A1CF59 |