ORIGINAL: SeaQueen
I can literally do it with a slide rule. Everyone is so math averse. It's just arithmetic. It isn't hard. They give you everything you need to know.
Unfortunately, the database viewer only gives you the fuel consumption figures for the clean condition. Different loadouts have an enormous impact on fuel consumption. For example, consider some loadouts for an F-15E cruising at high altitude.
Clean - 32.45 kg/min
Mavericks - 38.6 kg/min
AMRAAM Light - 39.1 kg/min
AMRAAM Heavy - 46.8 kg/min
Assorted JDAMs - 49.5 kg/min
Mk.84s - 62.5 kg/min
Fuel consumption can nearly double, depending on what's being carried. Unfortunately, the only way the player can currently get these precise figures is by putting a plane in the air and flying it.
If you try to figure out fuel consumption from the loadout description and database viewer, it quickly bogs down. Consider this loadout: another plane with 4,855kg of fuel has a 300nm strike radius, composed of 40 minutes cruising at high altitude, 16.2 minutes military at SL, and 30 minutes loitering at low altitude plus a 5% reserve.
40 x Consumption 1 + 16.2 x Consumption 2 + 30 x Consumption 3 + reserve = 4,855 kg.
What are Consumption 1, 2, and 3? What if you want to use medium altitude instead, and need Consumption 4? Or military at high, for Consumption 5? To my math-challenged eyes the information just isn't there.
So yes, if a player really wants to they can plot complex courses, measure all their leg lengths in advance, do little tests to find out what the fuel consumption is, and put together a spreadsheet to figure out whether they have enough fuel to make it, and when they need to launch to have everything arrive together in a coordinated attack at the proper time from different bases. But that's slow, cumbersome, and just as exciting as it sounds.
Commercial CMO is an entertainment product. Doing aircraft fuel consumption admin is not so entertaining... Why not give the player integrated route-planning tools to help them move past the housekeeping quickly and accurately, and get them to the focus of their operations?
(And kudos for keeping your slide rule skills fresh! But I'd bet that in 2022 most of the new customers will hope we're a little beyond slide rules, nomograms, and knotted string. [:D])
