Originally Posted by hang4
Most hang glider pilots eventually get a vario (variometer) to detect thermals with. Like an altimeter except it tells you about the air you are in ...how fast you are being lifted or sinking, by a beeping noise. Now if someone were good in electronics and could build one in micro minature size and put in a RC glider that would send back just the audio to a set of headphones, man what a revolution it would make in RC gliders.
Vario's meant for RC gliders are readily available, and reliable. Some have verbal feedback that tell your AGL, and monitor your onboard battery voltage every so often.
A few places where they are available in the US are:
(us dealer http://www.xcsoaring.com/products/products.htm
In the RC glider realm, I find vario's most useful when the plane is too high to visually determine if the plane is in lift. At lower altitudes, I can see the plane react to lift before the vario can tell me about it. Partly because thermals an RC glider can work can be much smaller than the thermal size required for a hang glider. Thus, the delays inherant in varios become more of a distraction. For a craft as large as a hang glider, I doubt this would be an issue.