In the Aero section of the spreadsheet, there is little calculator for coefficient of drag. It looks like this: Frontal Area 1.17 Drag Cd 0.4815 Cda 0.563355 ISI 0.3451 My question is firstly, what is 'ISI'? And most importantly, do the spreadsheet entries expect coefficient of drag/area or this 'ISI' unit?
I think that specific section you are looking at is not useful. The ISI/rF2 coefficient is essentially just CLA( or CDA) * (0.5 * 1.225). The values you put in for the aero calcs are in rF2 coefficients.
Thank you Robin. So I'm going to assume 1.225 is the density of air in kg/m3? What does CLA stand for?
Yes, it's static 1.225 kg/m³. You can set specific conditions via upgrades where you simulate a different air density, but it's a bit clunky. You are right, it's Lift Coeff x Surface Area [m²]. I meant more if you just want to convert a value to ISI, but then again maybe just taking CL will be better. Testing both approaches is always viable.