The Art Applewhite Rockets X-Fire (pronounced cross-fire) is a dual motor bi-copter (i.e. it has two wings). The X-Fire line has replaced the Double Helix. It also uses a tube as the kit's 'backbone', however, the wings are parallel to this tube instead of being in-line. Like the Helix/Double Helix, these kits only have a handful of parts, including the basswood wings and an LOC/precision body tube. The only tools/materials required are white glue, a sharp hobby knife, and a ruler. They go together fast and easy. I wish flying them would be that easy. It appears I'll have to wait until June to get them up. At least that gives me plenty of time to paint them! A full review will follow shortly thereafter.