On Tuesday, February 26, 2013 11:14:14 AM UTC-5, Bill D wrote:

However, there is a difference between airplanes and gliders WRT the T&B. An airplane T&B displays a "standard rate turn" (2 minutes per 360 turn) as two needle widths. (Needle on the "doghouse" for the old guys.) That's 6 times too sensitive for a glider where the typical turn rate is 20 seconds per turn. Turns to a heading are much easier with an airplanes slow turn rate.

It's interesting to see how the TruTrak is marketed on the Cumulus website. He raises the "standard turn rate" issue.

http://www.cumulus-soaring.com/trutrak.htm