The following is an extensive catalogue of the variants and specific unique elements of each variant and/or design stage of the Boeing B-17 Flying Fortress, a heavy bomber used by the United States Army Air Forces and other Allied air forces during World War II.

Originally designed as a heavy bomber, it has now been relegated to the light bomber class. The landing gear, tail gear, wing flaps and bomb doors are elec- trically operated and the brakes and cowl flaps are hydraulically op- erated.

2024年4月26日 · B-17空中堡壘轟炸機（B-17 flying fortress）是美國 波音在1930年代為美國陸軍航空軍所發展的四引擎重型轟炸機。 當時參與競爭此200架新型轟炸機合約的還有 道格拉斯 和 格倫·L·馬丁 兩家公司。

The B-17 could carry a wide range of high-explosive, fragmentation, incendiary and special aerial bombs weighing from 100 to 4000 pounds of the M30, M31, M43, M44 and others types. In a combat situation, bombs of British and Soviet models were also suspended.

The Boeing B-17 Flying Fortress is an American four-engined heavy bomber aircraft developed in the 1930s for the United States Army Air Corps (USAAC). A fast and high-flying bomber, the B-17 dropped more bombs than any other aircraft during World War II, used primarily in the European Theater of Operations.

The Flying Fortress is one of the most famous airplanes ever built. The B-17 prototype first flew on July 28, 1935. Although few B-17s were in service on Dec. 7, 1941, production quickly accelerated after the U.S. entry into World War II.

2024年4月26日 · B-17空中堡垒轰炸机（B-17 flying fortress）是美国 波音在1930年代为美国陆军航空军所发展的四发动机重型轰炸机。 当时参与竞争此200架新型轰炸机合约的还有 道格拉斯 和 格伦·L·马丁 两家公司。

The B-17Ds bore the brunt of the early fighting in the Pacific. The aircraft was continually improved and ultimately evolved into the B-17G with its distinctive chin turret. Although it served in all theaters of WW II, it is best known for its role in daylight bombing over Europe.

I am looking for a B-17 that my grandfather flew on was a waist gunner during the Pacific War. He was on one of the plans that flew from California to Hickam Field on 7 Dec 1941. The plane survived the bombing.

Designed to implement the United States Army Air Corps concept of Strategic Bombing the Boeing B-17 Flying Fortress was the undisputed centerpiece of the U.S. air campaign in Europe during the Second World War.