What I *really* wish is that SeeYou Mobile and the L7 would take polars in the Cambridge/GNII format: max glide ratio; the speed at max glide (V1); and the speed at sink = -2 m/s (V2). Those figures generalize a polar a lot better than 3 coefficients which go all over the place depending on what data points you choose.

O/T: my FM lists a factory W&B empty weight of 180kg, but does not say whether that is with or without the main batteries. I know the Diana batteries are pretty much right on the CG reference point, but is it normal for "empty weight" to include batteries?