Hi I think there is or maybe was a front wheel driven tadpod from Russia, the S-327. On the page http://www.trike.ru/en/photos.php are some pictures off an three wheel drive tadpod trike, S-3 3x3 which could be an evolvement. But both are steered by handelbars. Gerald -----Ursprüngliche Nachricht----- Von: Vi Vuong <vi_vuong@xxxxxxxxx> An: Python <python@xxxxxxxxxxxxx> Gesendet: So., 21. Aug 2011, 18:36:09 GMT+00:00 Betreff: [python] FWD tadpole for velomobile 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