Try also these w & b spreadsheets, with graphs and PA calculations.
They take account of zero fuel weight.
For Bells, or any other machines where the c of g moves with the fuel load, all you need is a lookup table, and the command vlookup. I just updated the 212 one, and the lookup function is used with performance figures as well.
Phil
Phil
Having merged the threads on this topic, I've merged some of your posts with direct links to each of your spreadsheets to make them easier to find.
Heliport