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Frag Calc is an iOS calculator application for tanker pilots and operators. It allows for quick calculations of the amount of fuel available to offload to receiver aircraft, taking into account bingo fuel and offstay time. Multiple offload brackets can be added, with custom comments or callsigns.
Fuel units can be changed between tonnes and thousands of pounds for each entry type, and a slider allows the operator to choose between max offload, latest off-station time, and everything in between.