Notes: These pages mostly assume you're running a browser window at least 1000 pixels wide, and that you don't mind downloading up to 30kB as part of a page. That lets me put reasonable sized gifs in the text where they make sense, and many of them don't shrink very well. There is a tar.gz file (3MB) with the whole bundle in it so you can download that and browse offline, you can also get the DXF (CAD) files I used in it. Windows users need not fear, WinZip will deal with tar.gz files just fine, but sometimes non-MS users have trouble with .zip files.
I borrowed the Greenspeed pictured here from the Lamb family with a view to buying it. It's a tandem recumbent trike with trailer trike (trailer not pictured) Here's a Greenspeed photo of it. But it wasn't really what I wanted, despite the idea being a great one.
I started comparison shopping with the intention of not just making a Greenspeed clone, and looked around the web for ideas. Peter Eland has built his own, and TRICE in England make the X2 which breaks apart into very small sections. TriSled also have a tandem which I've seen photos of. But the more I look the more it seems that there is really only one tandem design - the Greenspeed one. Eventually I decided to buy a set of GS plans and go from there.
But getting to that point was entertaining. I bought a small notebook to record ideas in, and spent time thinking, drawing and talking to people. I asked a few questions on the trikes mailing list as well. Ken Wilson and Ian Humphries provided much needed advice, and tried very hard not to laugh at some of my ideas. I've recorded many of these ideas in these pages.
The first step for me is to build a trailer. This gives me some way to carry the bigger bits around easily, and also a chance to practice putting bike frames together. In the usual chicken-and-egg scenario, the easiest way to get the tube for the trailer home is to carry it on the trailer. The idea is to make something simple but with a decent carrying capacity. In this case a couple of BMX front wheels supporting some 1 3/4" tube, about 1.5m long and 1m wide. The attachment is going to be a bit crude, probably a couple of chain links (not bike chain!) and a clamp onto one side of the rear triangle.
A few useful Links