If you're really in still air, just fly at each speed (LD +/- 10 kts) for a minute or so and observe what your glide computer says. Most have a "Instantaneous L/D" display. See which LD is better for your unique situation.

Rob Dunning

On Wednesday, May 8, 2013 2:58:34 AM UTC-4, Ramy wrote:
Say overall speed is not an issue (you are not racing) and the only objective is to achieve best glide to make it home with a marginal final glide. Also lets assume you fail to maintain the correct speed and deviate +/- 10 knots. Which will have less penalty, flying 10 knots too fast or too slow than best glide? so for example, if best glide is 60 knots, which speed will have better chance to get you home, 70 knots or 50 knots?

Assuming stable air with no wind, but will be interested to hear opinions for other conditions.



Ramy