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In the following polar curve, there is a symbol "E" with the number 33.5 next to it. What does this mean?

Polar Curve ASK-21

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  • $\begingroup$ This seems to be the sink speed polar of a motor glider. Which one? $\endgroup$ – Peter Kämpf Jul 8 '18 at 16:48
  • $\begingroup$ Why is I called a polar? $\endgroup$ – copper.hat Jul 8 '18 at 18:13
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E is used as the symbol for L/D in German. Normally, a symbol description will call it "Gleitzahl" (glide ratio).

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