LXNAV S80 Pilot Reports?

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.

krasw, where do you set your ISU% ? at Richard's (Craggy Aero) suggestion I have mine set at 50%. I am not even certain I know what adjusting the ISU percentage actually does. Anyone that has an opinion on that subject pleas jump in here.
I have Butterflies in both seats of my ASH25 and will assign the co pilot the job of mapping thermal probability using instant wind variation, Perhaps you have discovered a secret weapon.
Dale

On Monday, August 3, 2015 at 7:15:06 PM UTC-7, wrote:
krasw, where do you set your ISU% ? at Richard's (Craggy Aero) suggestion I have mine set at 50%. I am not even certain I know what adjusting the ISU percentage actually does. Anyone that has an opinion on that subject pleas jump in here.
I have Butterflies in both seats of my ASH25 and will assign the co pilot the job of mapping thermal probability using instant wind variation, Perhaps you have discovered a secret weapon.
Dale

The percentage inertial mix affects only the Vertical Air Mass needle, not the wind or vario as far as I am aware (that is what Butterfly told me). I have it set to 80% inertial. If it is set to 100% it gets pretty jumpy and hard to interpret. The wind is always 100% inertial (though perhaps with some drift correction using GPS) and the vario seems always to be barometric. The vario and VAM also have separate time constant settings. The difference between the vario and VAM needles gives clues to thermals and horizontal gusts.

On Tuesday, 4 August 2015 05:15:06 UTC+3, wrote:
krasw, where do you set your ISU% ? at Richard's (Craggy Aero) suggestion I have mine set at 50%. I am not even certain I know what adjusting the ISU percentage actually does. Anyone that has an opinion on that subject pleas jump in here.
I have Butterflies in both seats of my ASH25 and will assign the co pilot the job of mapping thermal probability using instant wind variation, Perhaps you have discovered a secret weapon.
Dale

I have used vario/inertial mix between 75-85%. I think you loose a bit of inertial data with 50% mix, though ISU installation "quality" might affect optimum mix. My ISU is in very good place at rear fuselage (yes it was pain to install), it gives sensible readings even at 100% mix.

My vario time constant is slow 3,4 sec and inertial netto time constant fast 1 sec to get instant readout of vertical gusts (helpful when thermalling).. Wind calculation time constant is 5 sec.

Following wind variations during flight really takes time and learning (mainly to start build mental 3D image of the airflow around you). No proper instrument existed before to measure it this fast and reliably.