Well I've started hacking some of the default xml gauges and now actually have a working airspeed indicator and vsi for my glider. The only problem is the vsi is working like a normal vsi that shows the rate the aircraft is climbing or descending. Does anyone know how I can change this to model a TE (total energy) vario? If you're unfamiliar with a TE compensated vario, it just compensates for any apparent lift or sink caused by airspeed changes (ie: a false climb indication caused by a pilot pulling back on the stick. In other words, the aircraft may be climbing even though it is in "sinking" air. The TE vario reads the rate of rise or sink of the airmass the plane is flying thru, more so than the rate of climb or sink of the glider. Here's the xml code for what I have so far: &ltGauge Name="DG808vsi" Version="1.0"&gt &ltImage Name="vario.bmp" Luminous="Yes" ImageSizes="256,256" /&gt - &ltElement&gt &ltPosition X="126" Y="126" /&gt - &ltImage Name="needle_01.bmp" Luminous="Yes" ImageSizes="119,7"&gt &ltAxis X="14" Y="3" PointsTo="East" /&gt &lt/Image&gt - &ltRotate&gt &ltValue Minimum="-10" Maximum="10"&gt(A:Vertical speed,feet per minute) 100 /&lt/Value&gt - &ltFailures&gt &ltSYSTEM_PITOT_STATIC Action="0" /&gt &ltGAUGE_VERTICAL_SPEED Action="Freeze" /&gt &lt/Failures&gt - &ltNonlinearity&gt &ltItem Value="-10" X="189" Y="184" /&gt &ltItem Value="-6" X="118" Y="209" /&gt &ltItem Value="-4" X="82" Y="194" /&gt &ltItem Value="-2" X="57" Y="165" /&gt &ltItem Value="0" X="48" Y="126" /&gt &ltItem Value="2" X="54" Y="90" /&gt &ltItem Value="4" X="80" Y="60" /&gt &ltItem Value="6" X="115" Y="45" /&gt &ltItem Value="10" X="188" Y="68" /&gt &lt/Nonlinearity&gt &ltDelay DegreesPerSecond="30" /&gt &lt/Rotate&gt &lt/Element&gt &lt/Gauge&gt Darrell

Does the TE gauge really measure vertical velocity of the air mass, either up or down, or does it show the true vertical movement of the aircraft relastive to a datum, like mean sea level?nick

If it's air mass, tryAMBIENT WIND Yand if it's aircraft movement, tryVELOCITY BODY YNot tested, just took them from my list of variables.nick

I tried the ambient wind y, haven't tried the other one yet. It froze the needle at '0'. Hmmmmm.... still trying :)Darrell

See: http://en.wikipedia.org/wiki/Variometer#To...gy_CompensationI

Nicely written article. Since you're apparently a "Wiki" kinda fellow, do your know about the specialized FS Developer's Wiki site?http://fsdeveloper.agerrius.nl/wiki/index....title=Main_PageIt would be nice to have some cross-links to any relevant "Wikipedia" related entries there I should think... ;)