Definitely true about A LOT of drag on PSS biplanes. Probably a lot less drag on the Rutan model than on my Beech Staggerwing.
Sounds like a great project.
Originally Posted by Alex.Schweig
If you use good airfoils that give you lift but little drag, it might be a very nice PSS sloper.
I´ve heard of biplane PSS and it always went wrong because the airfoils were too draggy. The extra wing provides extra lift, but also lots of extra drag ..
Go for it! I´d like to see a plane that nice flying as a sloper.