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.