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Maybe I was unclear. The above picture just got me thinking if it could be done differently. I don't think the frame above is nearly as clean as 7ven's sketch. (Croft's sketch??)
It is just that the stem height of the stoker is determined by the seat post height of the pilot. It would make the frame more flexible in the future if it could be separated, and if you could use that for actually stiffening the frame it would be a win win..@7VEN: FSA SLK Light is shit. I have just had the threaded alu insert come loose in the drive side arm. FSA is pushing the responsibility over to danish local dealer who refuses to do anything about it.
Hulsroy-
It is just that the stem height of the stoker is determined by the seat post height of the pilot
What do you mean by this? It's unusual for a stoker to want a stem higher than the pilot's saddle, and the stoker stem can go up and down on the seatpost.This came up in my tandem thread a while back as an alternative, but that doesn't mean it's a good alternative...
http://www.bikequarterly.com/images/BilenkyTandemFull.jpg(urgh shitty Microsoft edge is messing with my formatting, pic supposed to be at end, text supposed to be quote, etc)
6pt
How come? Wouldn't the alu stem be lighter and give you more options for adjusting length then an extra headtube?
(Although I can't for the life of me work out how you get it on/off)
Edit: its steel and I think it's brazed on so ignore me.