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Posted 6/25/2009 Printable Fact Sheet
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Boeing JB-17G
3/4 front view of Boeing B-378 test bed for turbo prop engine, in flight near Edwards Air Force Base, Calif., on Aug. 9, 1956. (U.S. Air Force photo)
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Starting in 1943 and continuing after the end of World War II, some B-17Gs were converted for second line duties. The majority of the modified aircraft were made into transport variants. The CB-17G was initially designed as a troop transport capable of carrying up to 64 troops. The VB-17G was a VIP transport for high level staff officers.

The SB-17G, initially designated B-17H, was modified for use as a rescue aircraft. The RB-17G, initially designated F-9C, was a reconnaissance variant. A few aircraft were converted for use as drone directors and designated DB-17G.

The most unusual conversions were three B-17Gs converted to engine test beds. The nose section was removed and replaced with a strengthened mount for a fifth engine. The Pratt & Whitney XT-34, Wright XT-35, Wright R-3350 and Allison T-56 engines were all flight tested on JB-17Gs.

Type Number built/
CB-17G 26 Transport conversion
DB-17G ? Drone director conversion
JB-17G 3 Engine test bed
RB-17G 9 Recon conversion; F-9C
SB-17G 12 Rescue conversion; B-17H
TB-17G ? Trainer conversion
VB-17G 8+ Staff transport conversion

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