Rangarira ndima iri pasi apa uye ipapo pindura mubvunzo gare gare mumutauro mumwe chetewo sechikamu:  Passage: Zvisinei, USAAC akanga mwoyo kubudirira zvikabva, uye musi wa17 January 1936, kuburikidza pamutemo loophole, Air Corps akarayira 13 YB-17s (akatarwa Y1B-17 pashure November 1936 kuratidza ayo chaiwo F-1 mari) basa yokuedzwa. The YB-17 akabatanidza dzinoverengeka kuchinja zvinokosha kubva Model 299, kusanganisira simba zvikuru Wright R-1820-39 dutu injini. Kunyange zvazvo zvikabva zvaita kambani-anazvo uye haana kugamuchira muchiuto Serial (the B-17 zita pacharo haana kuoneka pamutemo kusvikira January 1936, anenge mwedzi mitatu pashure zvikabva zvaita aparara), rokuti "XB-17" akanga retroactively kushandiswa NX13372 kuti airframe uye akapinda lexicon kutsanangura wokutanga Flying Fortress.  Mubvunzo: Mauto Emuchadenga akakwanisa sei kuraira ndege dzeYB-17 13?
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