Can anyone out there explain to me which Twin-Wasp engines went in the various models of the Curtiss Hawk 75? It was with joy that I obtained a copy of Gerry Beauchamp's and Jean Cuny's book, Curtiss Hawk 75. It explained and clarified many things, except the engines. If you category all the engines with all the planes supposedly associated with them, then according to the book you would get something like this:
engine aircraft fuel octane SCG Y1P-36, H75A-1 87, 100(tested by France) S1CG P-36A(late) 100 S1C1G P-36C 100 SC3G H75A-1, H75A-2, H75A-3 87 Y1P-36, P-36A S1C3G H75A-3, P-36A, P-36C 91/98, 92, 91
-13 Y1P-36, P-36A(early), H75A-1 H75A-2, H75A-3 92,100
-17 P-36A(late), P-36C 100
As you can see not a lot makes sense. I certainly don't fault the authors. They were simply reporting from there various sources, but it certainly makes for confusion. I understand that the U.S. military designations R-1830-13 and R-1830-17 had a civilian equivalant. I believe(?) that the -13 is the exact equivalent to the R-1830-SCG. The
-17 is much trickier for me. In the book, the majority of P-36A's had a -17, even though all my earlier sources said it had the -13. Yet the book also states that the P-36C had a different engine, the S1C1G as compared the earlier S1CG in the majority of P-36A's. I could go on and on, please help!