Well, the nice thing about a swing boom being made out of an existing bike is you just use what's already there. If you start re-bending fork legs and chopping head tubes to adjust angle and traill, it's probably easier to build from scratch. The two guys that have the swing booms said they'd sent me some photos, but who knows when that'll be. For the one I was going to make, I was simply going to extend the FD tube up and connect it to the fork crown instead of running it up to the handle bars. | It looks like that has a steering head angle of about 90 degrees and a large rake. Is that right?Traylor's plans call for an angle of 65 degrees and a rake of 1 inch, I think. How did you choose those steering parameters? I'd really like to see any more information you can provide, as I'm preparing to build one of these, probably this weekend, and I had planned on using the parameters above. I'm especially interested in the details of the joint between the front fork and the dropouts for the front wheel. Thanks for the photo and info. | | -Rod | | PS: I think I'll try it without handlebars first. | | -------------- Original message -------------- | From: "25hz" <25hz@xxxxxxxxxx> | | > Diggin up another old post . . . | > | > I helped two friends build two swing boom FWDs like Tom Traylor's and a | > friend of mine built another one | > (http://georgianbents.ca/trikefest%20fwd%20aug%202005.jpg), only they didn't | > look quite as refined as Tom's. Both of my friends' were no-weld versions, | > but I took the one bike and welded all the joints and removed and filled up | > the bolt holes (as best I could, anyway). The yellow bike was really hard | > to ride because the back rest kept twisting on it. The one guy moved and I | > just heard back from him so I'm hoping he can send me some pictures of his | > swing boom bent. | > | > For riding, they didn't feel anything like the python, at least in my mind, | > and they all had a fairly upright seating position. When you first started | > pedalling, you had to counter steer with the opposite arm and to turn it was | > a matter of fighting your arms with your legs or vice versa. This was only | > when first riding it, because after a few minutes, the control really | > smoothed out as you relaxed. Still being a novice on it, I found my arms | > and legs were moving as if I was walking and slight opposite pressure from | > my arms would counter the pedal force, so I sort of did the "salmon pedal | > steer" thing. When both my friends rode, they were as smooth as silk and | > one of them could ride with no hands as he had been commuting on his (about | > 15km round trip) for nearly two weeks. I was amazed because I had to keep | > pretty firm pressure on the handle bars at all times and couldn't imagine | > taking my hands off. Also, this was after I had over 500km on the python, | > so I was fairly competent at riding with just foot and hip control. | > | > I still want to build one of them anyway and there's no reason you have to | > use 26" wheels in a 26" frame so for ease, I'll maybe take a 27" frame and | > use 24" wheels. I really want to give the design a chance and see what it | > rides like if I get used to it. I'm really starting to prefer a laid back | > seat angle for better aerodynamics, like 30 degrees or flatter, but I don't | > know how that will adapt to a swing boom, or even the python trike. I guess | > I'll just have to try it and find out. ============================================================ This is the Python Mailinglist //www.freelists.org/list/python Listmaster: Jürgen Mages jmages@xxxxxx To unsubscribe send an empty mail to python-request@xxxxxxxxxxxxx with 'unsubscribe' in the subject field. ============================================================