| Tail Number / N-Number | N4588 |
| Manufacturer | THORP |
| Model | T-18 |
| Year Built | 1973 |
| Manufacturer's Serial Number | 671 |
| 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 | 0-290 SERIES |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 140 hp (104 kW) |
| Average Cruising Speed | 97 miles per hour |
| Type of Registrant | Individual |
| Owner Name | SMITHENRY ERIC J |
| Street | 4973 N 1500TH ST |
| City | NEWTON |
| State | IL |
| Zip Code | 62448-4616 |
| Region | Great Lakes |
| County | Jasper County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 1979-12-03 |
| Certificate Issue Date | 2019-03-26 |
| Last Action Date | 2022-01-11 |
| Expiration Date | 2029-03-31 |
| Status | Valid Registration |
| Mode S Code | 51311504 |
| Mode S Code Hex | A59344 |