Dont they have incredible loiter time, and a fairly low stall speed? That alone could be useful, quickly fly to a search location, and hang out there for a while.
Excel is for noobs. Real men order microcontrollers and LED displays off Digikey, solder it all together, and program the formulas onto there in assembly.
Nah, what @kirk needs is one of those surplus Russian BMPs with the recovery crane, so he can more easily move around the stuff that he does have. Unfortunately, those have been a bit harder to buy as of late...