It says the gear reduction is 3.75:1 way too much reduction. My 1:1 motors aren't very fast but they are faster than his and with a load too. The props I use are the same diameter and pitch. 2:1 is perfect for these things. In any event, I couldn't fathom paying more than a couple hundred dollars for one, this tool wants $980!!! Oh well, some fool will pay it.