Curve:  You’ll notice two fields. The first field selects the type of curve, and Expo is the default. Let’s see what else is there: use +/- to navigate to the Expo field, SP ENT to select, and +/- again to scroll the list. Wow – another remarkable capability!  An input can create an output response along any shape of curve, and different response curves can be switch selected for easy trials at the field.  Let all that potential soak in for what we might be able to do with Curves in future classes.  We’ll accept Expo for our class examples and move over to the adjacent field.

SP ENT to edit the value with +/- , and watch the shape of the curve change as you increase the amount of expo.  I’m going to use 60% Expo for our Ail 3D line, 45% for Ail Hi, and 30% for Ail Lo. Notice how fine the control response is to stick movement near center for high Expo values while retaining full control surface deflection at full stick movement.   You can actually watch how that changes at different expo values.  I don’t know about you guys, but I think this is waaay cool!

Please note:  If you have flown other radios, you probably know that most use positive values of expo to reduce channel output sensitivity near the stick center, but at least one major brand uses negative values of expo to achieve the same thing.  Taranis uses positive values to soften the servo response near stick center.  This allows the pilot to have large total deflection of a control surface at 100% stick movement while retaining fine control near stick center.  The tradeoff is a non-linear response of the servo to stick movement.

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