Hi All, I would like make another case for a center-steer FWD tadpole, not sure if we can call it a python tadpole when it's realized. Using the same pivot configuration as a bike, the trike could gain another driving wheel, as discussed here before in 2006, //www.freelists.org/post/python/Question-for-the-experts,4. The main requirement is hands-free riding like the delta version (all the time), but with improved high-speed stability / aerodynamics in velomobile application. The challenge seems to be making the differential / axle that retains the seat rise effect (tilting?). Any suggestions? Thanks, Vi