These units on the outer circumference (40, 80, 100, 120…), what are these? They can’t be either KG or GAL, but what?
Could be a total (combined) percentages of internal and external fuel?
ie …on your image you have 100% internal fuel and no external fuel?
I thought so, but, no, doesn’t figure. It’s H125 heli, there is no external, just a single tank. This scale doesn’t change whatever the aircraft is.
Maybe combined percent of both tanks …ie you are at 50% in each?
…scrub that if there’s only one tank!!
I think (!) it is percent of how much you need for your flughtplan. I am not sure out i think, i saw this when flying s c172 and adjusted the fuel.
If you fly the H125, theres probably no „real“ flightplan, thats why its always 100.