What does DI mean?
In the original Hawk T1/A reference cards (which includes checklist for example), there are tables of planning data included. There are a number of planning data sections, however the title of each section is prefix with DI and then a number, i.e. DI 0, DI 5, DI 10 and DI 15.
Looking at the figures in the table, it seems that these correspond to configurations that are increasingly draggy. This had led me to conclude that DI stands for Drag Index, which is 100% guesswork on my part.
Does anyone know what DI really means? And how to use the different sections?
Btw, the reference cards and aircrew manual can be found here:
@katchaplin Thanks. I guess DI 0 means a clean config, right? Probably every added weapon/fuel tank has a specific contribution to the DI.
The MSFS Hawk manual uses the performance data from the DI 15, which would correspond to the most draggy configuration. Well, I would have to try and see if the performance data corresponds to the DI 0 or DI 15 table.
@corvus5624 The actual performance seems to be for DI 0 in the clean training configuration. Now that they've added drop tanks as an option, not sure how they are modeled. Someone posted a link to the full manual, but I haven't really investigated whether it addresses the Drag Indexes for the Hawk.