See where it says "shaft drive" on the drain pipe? That's to indicate that they intend for the two cranksets to be coupled by a shaft running inside the drain pipe. Not necessarily a good plan, but it does mean the stoker won't be doing all the work.
Anyway, it's very old and all this was covered at length when Specialized unveiled this particular comedy mock up.
See where it says "shaft drive" on the drain pipe? That's to indicate that they intend for the two cranksets to be coupled by a shaft running inside the drain pipe. Not necessarily a good plan, but it does mean the stoker won't be doing all the work.
Anyway, it's very old and all this was covered at length when Specialized unveiled this particular comedy mock up.