Thank you AA5BY for your comments: I think I better incorporate a bit of down thrust! I'm probably going to stick with 1 degree negative because the top wing on the bipe I'm building has about 30% larger area than the bottom.

Strykaas I'm afraid that what I have found is that the bi-fly has been out of production for some time - I've seen a few on Ebay but that's about it. I must say my original bi-fly (built from a kit) was VERY heavy and consequently did not go all that well. It was only once I had built another one from the plan with some major modifications (including losing 1 3/4 lbs) that it performed well.

Right now I'm building my own design but I must say of all the kits I've been looking at the Phaeton sounds like an easily obtainabe and excellent option.

Cheers!