1. The red line is DA40 NG. The dashed red line is the max Zero Fuel Weight of same. I assumed all possible MAM's required to reach these limits.

2. The solid purple line is the envelope of DA40-180 with 40 gal tanks and 2646 MTOW option.

3. The dashed vertical purple line is the rearward limit of both a DA40 with 50 gal tanks

*and*the TDI variant.

4. The dashed horizontal purple line is both the Zero Fuel Weight for the DA40/2646 lb, and the MTOW for the TDI variant and the original 2535 MTOW.

There are some plot points which represent TOW and ZFW based on the "sample" NG in the POH and represent the loading of flight I took the year before last. Just ignore for now. These (and indeed the envelopes) are based on an Excel W&B I put together for the NG. I may fiddle with the spreadsheet so one could do comparative loading of these variants for a given flight profile.

Naturally there are more combinations, but I figured these are the most common 3 variants of the DA40.