Feb 22

Feb 22, 2004

I increased the pivot angle today and discovered that the greater angle, the more steering input you have (duh!). However, because my pivot is so far back, it results in a negative trail and that makes for a very unstable ride at faster speeds. Positive trail would have the "X" shown in the photo slightly in FRONT of the wheel - positive trail is a requirement because when you turn the wheel while moving, forward motion wants to return the wheel to straight - thus providing a balance for your steering input. If the trail is NEGATIVE as it is in this photo, then forward motion wants to continue a steer which could result in some very scary moments. Don't try this at home.

I'm getting a lot of help from Bob Rohorn who has designed this really slick trike with similar steering geometry as what I am attempting.

http://www.rohorn.com

I could do this the easy way and just simply do everything he tells me to do - then I would get it right the first time, but I'm thinking of doing it all wrong first, slowly making my way to something that works - which I am certain will end up being exactly what he told me to do in the first place.

The dilemma at this point is in order to obtain a POSITIVE trail, I need to make the pivot more horizontal which will reduce the amount of steering. What I really need to do is RAISE the pivot up and maintain my positive trail - (hey - exactly like the Rohorn S'trike!).

Here is the general idea, but still, the problem with this is I'd like to get the pivot even higher. I'll play with some ideas and see what I can come up with....


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