re: 60 MPH...achieveable? Who cares?!? Let blueprint an engine!
I have seen bicycles do 60MPH. I lived for many years in Enumclow WA. That's in the foot hills of Mt Rainier. There was a yearly race up to Paradise, in Mt Rainier Park. Those bikes just crawled uphill, but comming down they were sometimes puller over and ticketed by state police for exceeding the 55MPH limit! I have been passed by bikes while doing almost 60 and they were going faster than I was.