tiistai 28. heinäkuuta 2015 20.51.59 UTC+3 kirjoitti:
I have both. Butterfly for two years in an ASH25 and an S80 this summer in a Libelle. Both are better than any equipment I have had previously.

The instant winds on the Butterfly are cool but of little practical value (an exception might be ridge flying).
DLB

I think it has a lot of practical value. Thermals act as a barrier to surrounding wind, and wind is almost always much weaker in the area close to thermals. With instant wind readout it's easy to judge if you are inside this area, as it is usually the first sign of thermal nearby. And vice versa, if you don't see any difference in wind speed, trying to thermal is usually pointless as you are not yet in the best area. Crossing cloudstreets is really eye-opening: 25 km/h headwind in thermals changes to 50 km/h headwind between streets. And sometimes when glider seems not to glide as good as it should, answer is that you flew inside area of much higher headwind. My thinking about variations of wind in normal flatland thermal weather has really transformed based on BF vario. Lots of things to learn still with this instrument.

Tip for users: in expert-menu you can calibrate IAS and wind calculation improves.