vegav1341

The XB-38 (B-17E converted to V-1710s) flew in 1943-- lost after an engine fire less than a month later. Only one conversion, by Vega.

My father knew someone who was aircrew on the XB-38. The story he told me was that the AAF provided the B-17 to Lockheed as a test bed for installing Allison V-1710 engines on the B-17. The hope was that the Allison engines would give the B-17 better high altitude performance than the Wright R-1820 engines. The V-1710 engines were the same as those used on the Lockheed P-38 Lightning. During a test flight the crankshaft in one of the engines seized and the engine caught fire. The crew abandoned the aircraft. The crew was made up of a mixture of Lockheed employees and AAF crewmen. The AAF crew was equipped with new nylon parachutes whereas the Lockheed crew had older silk parachutes. The silk parachutes all failed on opening and the entire Lockheed crew died. The AAF crew survived. The program was never continued because it was decided the V-1710 engines were more badly needed on P-38 Lightnings.

That's the sole Boeing XB-38 version of the Fortress powered by liquid cooled Allison V-1710 engines (as used in the P-38)...40 mph faster than B-17 but lower ceiling....crashed after crew bailed out during engine fire en.m.wikipedia.org/wiki/Boeing_XB-38_Flying_Fortress

The XB-38 (converted B-17E) flew in 1943-- crashed after an engine fire less than a month later.