[Roger Gaemperle]

Steve,

Thanks for your reply. I guess only the original manuals could explain the differences. I was not able to locate them, unfortunately.

When looking for an explanation I found the following paragraph:

"The first attempts at constant-speed propellers were called counterweight propellers which were driven by mechanisms which operated on centrifugal force. A counterbalance was set up near or in the spinner, held in by a spring. When the propeller reached a certain RPM, centrifugal force would cause these counterbalances to swing outwards, which would drive a mechanism that twisted the propeller into a steeper pitch. When the airplane slowed down, the RPM would decrease enough for the spring to push the counterweights back in, realigning the propeller to the shallower pitch."

So it appears to be related to the constant speed propeller? But how was this solved with the earlier metall type propeller and with the large wooden propeller?

Maybe there is an airplane mechanic / propeller engineer in the forum who could help?

Thanks,
Roger