This thread is starting to read like War and Peace; I haven't read it all so somebody may already have posted this idea. I was watching "Tactical to Practical" on History Channel and they were talking conversion of military planes to firefighting . Part of the show showed a thing called "airborne modular firefighting system", designed to fit in the cargo bay of a transport aircraft, specifically a C-130. Sits on a double pallet with the ramp level with the cargo deck and two large nozzles (a foot or so in dia.) hanging with their tips just below the edge of the ramp, in the slipstream. Showed it in action, would make a helluva device to model on a Herk.