I strongly recommend that you start with about 1/2" of negative trail. With negative trail on a RWS trike, any side loads tend to straighten the bike out. The head tubes on the Walrus are vertical, and the horizontal pivot for the skates is 1/2" ahead of the vertical steering axis. When cornering at high "G" loading you can let go of the bars and it will quickly
With wheels instead of skates, you could get negative trail just angling the straight forks back, but that will induce some wheel-flop. You could get strong self-centering action with the forks angled foreward (conventionally) and enough rake (fork offset) to get negative trail.
You can check out the Walrus @
Mark E. Stonich
Minneapolis MN USA (612) 824-2372
Minnesota Human Powered Vehicle Assn. - Twin Cities Tandem Club
MnHPVA Web Site; http://www2.bitstream.net/~mstonich
Thursday, 29 January 2009