High effiency drivetrain with variable gearing

On 14 Dec, 18:19, Frank Krygowski wrote:

Using similar logic,
cranksets for bicycles are too expensive! Why? Because a Campy carbon
crank costs over $600. Therefore, we should all scoot along with our
feet on the ground, Draisienne-style!

It would be way more efficient. No need to supply a crank support
bearing and framework. Just use extendable stilts and variable
saddle height on a cantilevered beam. Hmmmmn.

Actually, probably only modest extensions required to enable proper
foot placement and efficient drive. Some sort of sling support is
required to reduce muscular effort and control the path of the leg
during the lifting part of the pedalling phase. I wonder has anyone
tried this fpor a HPV entrant.