In this post I will finish all the remaining details on the front of the R-1820 engine. (As I mentioned in earlier posts, this model is intended for the outdoor scenes, with closed cowlings. That’s why I recreated the more complex rear part in a simplified form, just to check if it fits properly to the airframe).
One of the most exposed “Cyclone” details is the variable-pitch propeller governor (Figure 89‑1):
This is an additional unit that controls the pitch of the Hamilton-Standard propeller. (It controls the oil pressure, which determines the actual pitch of the propeller blades). You can find it in every aircraft, but it is often dismounted from the “standalone” engines, presented in the museums. The large wheel at its top is used as an actuator attachment. The actuator can be a pushrod or a cable from the cockpit. In the case of the SBD (and many other WWII aircraft) it was a control cable (Figure 89‑1b). The engine depicted in Figure 89‑1a) is a standalone museum exposition, thus it lacks such a cable.