Next One, Another Tandem

The next project has started, its another tandem Instead of moving the bottom brackets, I am changing the angles
mainly the seat tubes which will be laid back towards the rear wheel allowing about 45 to 50 mm clearance for the tire.This has the same effect of moving the bottom bracket forward, I personally like the bottom bracket about 160 to 250 mm forward of the seat centre verticle line. Knees are not as flexible when you get older.
then the centre seat post will be set on the same angle as the rear one,  the crank centres will be approximately
500 to 600 mm apart this is still to be decided.The front bottom bracket to head tube still needs setting, and I think a horizontal top tube between the head tube and seat posts will just about complete the basic frame.
TBC........