Last summer we showed the latest version of Bob Horn's recumbent racer with two wheel steering. If you're new here, Bob's race bike is his own design and entirely scratch built and when you decide to incorporate 2WS, you can't just look around to see how everyone else did it and choose the method you like best, because recumbent 2WS race bikes are non existent. So Bob thought about the problem, came up with a solution, fired up the metal lathe and got to work.
He has a nice explanation on his website with photos of his "split hub center steering" assembly and his engineering looks both well conceived and beautifully executed. Of course this leads to a logical next question, if you can steer the drive wheel, why couldn't you drive the steering wheel? As you might guess, Bob is already thinking in this direction which means we could see a 2WS and 2WD racer. Stay tuned.