Wright R-1750AB
Wright R-1750 series engines were intermediate developments of the Wright P-1 and P-2 Cyclones, and led to the R-1820 Cyclone. R-1750 variants powered the Keystone XLB-6, LB-6, LB-9, LB-10, LB-11, LB-11A, B-5A; the Thomas-Morse Xo-21A; Douglas O-29 and General Aviation C-14 and C-15. The R-1750AB produced 525 hp.