| Tail Number / N-Number | N881JB |
| Manufacturer | BLEWSTER JAMES C COL USA RET |
| Model | RV4 |
| Manufacturer's Serial Number | 1289 |
| 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 | HAMMER ROGER W |
| Street | 8650 ISLAND DR S |
| City | SEATTLE |
| State | WA |
| Zip Code | 98118-4734 |
| Region | Northwest Mountain |
| County | King County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 1989-01-19 |
| Certificate Issue Date | 2020-09-24 |
| Last Action Date | 2020-09-24 |
| Expiration Date | 2027-09-30 |
| Status | Valid Registration |
| Mode S Code | 53021126 |
| Mode S Code Hex | AC2256 |