Co-Motion also build tandems with no diagonal tube. Pretty sure somebody there has a calculator and a book of engineering formulae :-)
I've always wondered how Alex Singer got away with no diagonal tubes on his tandems:
It cannot be just the tiny triple triangle at the back right?
He was one of the best tandem builders in the 40s and 50s, and laws of physics where the same then, so probably he knew what he was doing...
I feel bad I have shown a Singer in the AntiPorn thread, but I had to illustrate my question...
(I also always wondered about his tandems why he didn't have the drive chain from the rear chainring directly, like on a lot of tandems... Jack Taylor tandems have that detail too...)
I've always wondered how Alex Singer got away with no diagonal tubes on his tandems:
It cannot be just the tiny triple triangle at the back right?
He was one of the best tandem builders in the 40s and 50s, and laws of physics where the same then, so probably he knew what he was doing...
I feel bad I have shown a Singer in the AntiPorn thread, but I had to illustrate my question...
(I also always wondered about his tandems why he didn't have the drive chain from the rear chainring directly, like on a lot of tandems... Jack Taylor tandems have that detail too...)