The RB-36E was born from the YB-36A developmental model and an additional 21 B-36A production models for the reconnaissance role. These then ended their days as reconnaissance platforms upgraded to the D-model standard. The B-36F followed the D-models as well but instead were completed with 6 x R-4360-53 radial piston engines of 3,800 horsepower as well as 4 x J-47-GE-19 series jets. 34 of the mark were delivered. The reconnaissance model became 24 of the RB-36F series.
The B-36H introduced a new cockpit and mission equipment but more or less followed the B-36F model line. 83 of this mark were completed. The NB-36H was a one-off H-model product used in nuclear reactor propulsion trials in an attempt to produce a heavy bomber powered by nuclear means. The RB-36H was the reconnaissance H-model form.
The B-36J was introduced as a high-altitude strategic bomber variant and brought along increased fuel stores for improved range, a reinforced undercarriage, and tail-gun-only defensive armament. 33 of this type were completed.
The B-36J featured a length of 49.4 meters with a wingspan of 70 meters and a height of 14.25 meters. Its empty weight was listed at 166,165lb with a Maximum Take-Off Weight (MTOW) of 410,000lb. Its typical crew complement numbered thirteen specialists. Power was served through 6 x Pratt & Whitney R-4360-53 "Wasp Major" radial piston engines of 3,800 horsepower with assistance from 4 x General Electric J47 series turbojets delivering an additional 5,200lbf of thrust. Maximum speed reached 418 miles per hour with cruising speeds of 230 mph. Combat radius lay in the 3,985 mile range with a ferry range out to 10,000 miles. The B-36J's service ceiling was 43,600 feet and rate-of-climb measured at 1,995 feet per minute.
Beyond its 72,000lb internal bombload, the J-models carried 2 x 20mm M24A1 cannons in a remote-operated tail turret to protect against closing threats from the rear.
The B-36 went on to stock the inventory of the United States Air Force solely and was never exported nor used by any other U.S. service branch. It formed a major component of Strategic Air Command (SAC) for years after its introduction while also fulfilling the general heavy bomber requirement of several bomber wings and the reconnaissance role for a few other groups. 384 total aircraft were ultimately completed from 1946 to 1954.
The line was eventually given up for good come February of 1959 as the B-36 was now formally succeeded by the Boeing B-47 "Stratojet" series. Only a few complete B-36 aircraft exist today as museum showpieces with many having been scrapped decades ago.
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