Question – A single block reduces the force on the pull by ½ and double the length of the rope pulled and double the pulling force? This is the typical quote made on all popular 4x4 winching sites. I have found this http://www.hardworkingtrucks.com/winch-pulling-power/ http://www.gowarn.com/warn-winches/winch-tips.aspx http://cdn.shptrn.com/media/mfg/437...ostPeopleDontKnowAboutWinching.pdf?1289591024 Having considered the above I feel pulley being used just to change the direction of a force. Considering friction this would in fact reduce the pulling force of the electric winch and not increase the pulling force. The Question – Is the popular 4x4 winching strategy of a single block actually providing a doubling of pulling power (not considering friction) or not?