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Much more interesting is this very unusually shaped ATF design, the Model 908-833. Its particularity is to use the the on-board inert gas generation system or OBIGGS.
Interestingly the basic model number "908" goes back to the LightWeight Fighter (LWF) competitions of the early 1970s, so it's interesting that it was reused here for a mid-1980s project (I really hope that one day we can understand the Boeing logic in designating their projects...).
Source:
FIGHTER AIRCRAFT OBIGGS STUDY Volume I
BOEING MILITARY AIRPLANE COMPANY, June 1987
AIR FORCE WRIGHT AERONAUTICAL LABORATORIES AFWAL-TR-87-2024
(OBIGGS) processes engine bleed air into a nitrogen rich gas suitable for fuel tank inerting. Since the inert gas is produced during aircraft operation, the logistics problems of resupply vanish. Furthermore, the OBIGGS has weight and maintenance advantages over the foam system. (...)
The objective of this study was to develop a prototype development plan for installing the best choice OBIGGS in an Advanced Tactical Fiqhter (ATF). The best choice OBIGGS was based on detailed studies of inert qas requirements for AIF missions and trade-off studies to arrive at the best systcm preliminary desiqn. Detailed specifications were defined for' the best choice OBIGGS and life cycle cost studies were conducted to compare this OBIGGS with other fuel tank fire protection techniques.
Interestingly the basic model number "908" goes back to the LightWeight Fighter (LWF) competitions of the early 1970s, so it's interesting that it was reused here for a mid-1980s project (I really hope that one day we can understand the Boeing logic in designating their projects...).
Source:
FIGHTER AIRCRAFT OBIGGS STUDY Volume I
BOEING MILITARY AIRPLANE COMPANY, June 1987
AIR FORCE WRIGHT AERONAUTICAL LABORATORIES AFWAL-TR-87-2024