The Pratt & Whitney J75 (civilian designation: JT4A) is an axial-flow turbojet engine first flown in 1955. A two-spool design in the 17,000 lbf (76 kN) thrust class, the J75 was essentially the bigger brother of the Pratt & Whitney J57 (JT3C).

You can find military-style boots, high top sneakers, slip ons, dress shoes and everything in between at J75 Shoes. Offering an incredibly diverse selection of colors, materials, and details, J75 Shoes caters to the individualist who craves the look and detailing of …

The J75 powered the first U.S. operational Mach 2 fighter-interceptor, the Convair F-106 Delta Dart, and the Republic F-105 Thunderchief fighter-bomber, Lockheed U-2A reconnaissance aircraft, and North American F-107A. The JT4 was used on the Boeing 707-220/-320 and the McDonnell Douglas DC-8-20/-30 airliners.

The larger J75 incorporated many mechanical and aerodynamic improvements. The military version with afterburner powered the Convair 106 interceptor and the Republic F105 Thunderchief fighter-bomber. This artifact is installed in the museum's F105, which served in Viet Nam.

Learn about the Pratt & Whitney J75-P-17 Turbojet Engine that powered the F-106 Delta Dart Ultimate Interceptor the last of the Century Series Fighters

J75 engines were rated at 109 to 118 KN (24,500 to 26,500 lb) thrust with afterburner, depending on the model. The J75 powered the Convair F-106 Delta Dart - the first U.S. operational Mach 2 fighter-, the Republic F-105 Thunderchief fighter-bomber, and North American F-107A.

Mar 25, 2025 · The first prototype CF-105 was powered by two Pratt & Whitney J75-P-3 engines. The J75 is a two-spool axial-flow afterburning turbojet. It has a 15-stage compressor section (8 low- and and 7 high-pressure stages) and 3-stage turbine section (1 high- …

Pratt & Whitney J75 (JT4) The Engine: Specifications : The J75 was a scaled up J57 and first flew in 1955. This turbojet was in production from 1956 through 1967.

The J75 was a scaled up J57 and first flew in 1955. This turbojet was in production from 1956 through 1967.

Aware of the competition from the Rolls-Royce Conway turbofan, Pratt & Whitney decided to develop the JT3D turbofan from the JT3C turbojet for later deliveries of the Boeing 707 and the Douglas DC-8, then nearing entry into service. A 2-stage fan replaced the first 3 stages of the 9-stage JT3C LP compressor.