The wheel the speed I am trying to calculate is under 20mph.....it all depend on the power needed to climb the hills. most people with cargo bikes on average hills will not need more that a two thirds hp motor if they pedal hard.
If I build this it will be with a one hp motor on trike velomobile.
If you looked at my blog you could see that it took me years of asking questions just find out how simple it was. Because most people can't understand that motors do not get the full HP until they spin at peak efficiency rpm.
And because they all want to go as fast as they can despite any laws.