For boosters that are about the same length as a foam parasite glider, I understand that it's more stable to have a balanced number of gliders symetrical around the core as in the old 'Space Twins' plans. But for a single parasite glider like the Orbital Transport, how long does the core need be to keep a fairly straight boost? I've put a foam shuttle on a Mean Machine with no problem, but that's too long to scale down. I want to put one of those little foam delta wings such as come with the Flisk Tri-Glide on to a small booster. I put two on a 13mm Gnome that worked, but what design would loft just one?