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J3 Gliding L/D

1940_owner

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Found another heirloom from my Dad today. Was cleaning my garage and discovered a table he made of J3 L/D numbers and gliding. I have no idea if these are accurate and wanted your opinions.

A bit of background on my Dad. His started with the Weather Service/NOAA in WWII as a weather observer in Alaska and then the North Atlantic with the Coast Guard. He was a meteorologist and spent his career in Seattle as an Aviation Weather Forecaster. He was very meticulous and kept volumes of notes on everything. I suspect he attempted to verify these L/D numbers in our J3.
J3C_L_D_glide.jpg

Not sure about the Cd label he put. Something like Cd+1.25a/s, although the s might be a 5 (questionable penmanship)? I obviously am not fluent in aerodynamics. What do you think of these numbers?
 

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