Re: TN 27 Gear Ratio

[frankr]

In your example, the ratio would be 25:50, which could be stated as 2:1 (two turns of the pinion to one turn of the prop gear). However, that is seldom the case in the real world. A typical 6hp motor has 15 teeth on the pinion and 26 on the prop shaft gear. So that is stated as 15:26 because it cannot be divided and come up with whole numbers. On your example, a tooth on the big gear would meet with the same tooth on the pinion on every second turn of the pinion. Over and over again. Making the ratio like the 6hp example means the same teeth do not match up for many turns. In other words it spreads the wear.