Lee ihe e dere n'okpuru ebe a ma zaa ajụjụ ahụ n'otu asụsụ ahụ dị n'okpuru ebe a: N'oge mbụ Boeing Model 69, ọ sitere n'ike mmụọ nsọ site na nsonaazụ nke ule na FB-6, nke a na-arụ ọrụ site na Pratt & Whitney R-1340B Wasp radial engine. Boeing setịpụrụ iji engine a na onye na-alụ ọgụ nke e mere kpọmkwem maka ọrụ ụgbọelu, na-eji otu fuselage welded-tubing na nku osisi osisi dị ka nke Model 15, ma na-agbakwunye nnukwu spinner iji belata ikuku ikuku gburugburu engine (a kwụsịrị na mmepụta). Ngwá agha bụ ma ọ bụ abụọ.30 na (7.62 mm) egbe egbe, ma ọ bụ otu.30 na otu.50 na (12.7 mm); nku nwere ihe mgbakwunye dị ala maka ihe ruru 25 lb (11 kg), gbakwunyere bọmbụ nke ise nwere ike ịdabere na fuselage.
nsonaazụ nke ule na FB-6