https://en.m.wikipedia.org/wiki/Pratt_%26_Whitney_R-1830_Twin_Wasp

프랫 휘트니 R-1830


https://en.m.wikipedia.org/wiki/Wright_R-1820_Cyclone

R-1820


https://en.m.wikipedia.org/wiki/Wright_R-2600_Twin_Cyclone

R-2600


https://en.m.wikipedia.org/wiki/Pratt_%26_Whitney_R-2800_Double_Wasp

R-2800


https://en.m.wikipedia.org/wiki/Wright_R-3350_Duplex-Cyclone

R-3350

@Promotion