ZZ wrote on 7/12/2016 9:00 PM:
What caught me by surprise was his glide calculations used computed
TRUE SINK as well. This might have made sense to me if he was
measuring vertical speed with a rate instrument but unless I am
mistaken, he measured sink rate using an altimeter and a stop watch.

Since the altimeter (properly corrected) would give true altitude loss,
and the stop watch would give true duration, I think (altitude
loss)/(duration) would give true sink rate.

--
Eric Greenwell - Washington State, USA (change ".netto" to ".us" to
email me)
- "A Guide to Self-Launching Sailplane Operation"

https://sites.google.com/site/motorg...ad-the-guide-1
- "Transponders in Sailplanes - Dec 2014a" also ADS-B, PCAS, Flarm

http://soaringsafety.org/prevention/...anes-2014A.pdf