Originally Posted by
rpenmanparker
Are you sure about sitting lower? The bottom bracket height and therefore the seat height have to be fairly standard to accommodate the crank arm length. Three inches lower would make the crank strike the ground on every revolution or at least certainly in the corners. I think the rider position and height must be the usual.
True. I never measured it. I would have bet our BF rode lower to the ground, than our regular tandem. But as you point out, it couldn't be 3 inches lower.
So, if the the rider on the BF is not appreciably lower, the draft is going to be better because the following rider can get a bit closer to the BF rider without overlapping wheels.