Ray Allison's USS LWB Tandem


Ray Allison brought a blue recumbent tandem he built for his daughter in Iowa. Looks a bit like two Tour Easy frames joined together, but with under seat steering, which his son-in-law prefers. Main frame is 1 1/2 muffler pipe top and bottom tubes, joined to donor bike front and rear sections. The front down tube needed a little bending (with a come-along winch!) to get things to fit right. It was all acetylene brazed except for the manufacturers joints in the front and rear sections that were left intact as much as possible. Ray says it handles well solo or with a volunteer on the back, and the stoker has amazingly little effect on it.



The crowd was very impressed, and Ray was invited to come back any time with his trike too.

Beautiful workmanship throughout the bike, even though it's only his 3rd one (Not that his first one, a Tadpole trike has any ugly on it). This isn't the 1st time I've seen someone, who learned metalworking at a "Real Job", build a great looking bike without any input from frame or HPV builders. Ryan Fuchs' Tadpole Trike or Ray Bricks USS LWB come to mind. Mark



It has LOTS of seat adjustment range along seat rails attached to the top of the main tube. Seats are two older style BikeE seats. Tires are 20 front and 26 rear, though the front fork was originally 26" and needed shortening and re-brazing. The USS remote steering needed to be tweaked to a 1.5:1 ratio in order to get enough steering motion, especially at slow speeds (other LWB riders will understand!).



The fillets on Ray's frame are the smallest I've ever seen, no bigger than TIG welds. Ray, retired pipefitter, used Brutus-G 100,000 psi brazing filler.

Sounds too good to be true, but with it's rated 100,000 psi strength, tiny fillets should be all you need for Chrome-moly 4130, which is rated at rated at 135,000 psi.

I heard someone mention that the fillets didn't look strong enough. But the stuff Ray built his frame from isn't as strong as the filler rod, so bigger fillets would be a waste of filler and gas.
Mark


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