The tanks are 2 Bubble Jett 8oz bladder tanks plumbed in parallel. They have among other things as part of their mounting system a particularly strong black velcro strap robbed from a 90 sized heli. As far as the big patch of black you see in the area around the apex of the marine tuned pipe in the pictures of the airplane before paint, that does not touch the pipe (although it does get TOASTY warm in my hand when I launch the airplane) It is just carbon cloth in the lay-up of the molded streamliner tunnel to re-enforce it so I can squeeze it hard enough to hold it back without breaking her. Also notice the patented "Opti-Grab Handle" finger tip recess. (apologies to Steve Martin and
"PlaneBender" Dave Sullivan)