wrote on 9/21/2019 5:44 PM:
After all, would SH design a glider with doors that reduce
the climb rate by 300 fpm?

Apparently, they did. 443 FPM sink rate is listed in the manual with doors open and mast up. 110 fpm is listed with a 50:1 L/D. Do the math.

In addition to the doors, the mast and propeller contribute to the drag, as does
the landing gear and flap position. We have insufficient information for sorting
out the respective contributions to the 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