Re: ultralight/moped anyone?
Back to the nuts and bolts....and there is nothing wrong with dreaming.
A moped that will do 30 mph with just it and a rider will not make near that speed given the size of wing needed to get whatever weight you have off the ground.
You are right about the human powered crafts- they are amazing feets of engineering- particularly the materials they use...and those materials are difficult to obtain and expensive.
Dream on...but realize that there is a reason you don't find 3 or 4 hp flying machines. Trust me, if that worked, you would find them on the 'net.