Propellors connected by wheels to other propellors change speeds at different rates, which when given an opposite thrust command (forward/back, back/forward) causes some propellors to change direction before others, which 'jams' the other propellors into their current thrust direction. This results in the propellors fighting eachother for control of the shaft and winds up slowing them all down. This can be fixed by stopped the propellors manually before letting them change direction, however I do not see why this could not be fixed. Attached is the blueprint (which is quite large, user beware) and several clips showing this in action, as well as a picture of the propellor setup.
#Props Connected by Wheels change speed at different rates
blissful relic
As a note, this also affects the AI. any designs with props connected in a similar matter with wheels will jam on a random chance when changing directions.
brisk meteor