On Thursday, February 28, 2019 at 10:58:59 AM UTC-5, MNLou wrote:
I assume the handicaps are weight based and do not include any adjustments for prop drag on FES models or drag from unsealed bay doors for gliders with motors on a mast.

Is that correct?

I don't know of any data on unsealed bay doors. I do believe data on FES drag is out there someplace.

Thanks!

Lou

"Results of Flight Performance Determination of the Lak‐17a FES (S5‐3117)
using the comparison flight method
in Aalen‐Heidenheim‐Elchingen, August 20th and 21st 2012" - you can see it at http://www.front-electric-sustainer....A%20FES_en.pdf . If the link doesn't work use your search engine with title to find it. Fig 9 shows what to my eye is about 2 pts less of L/D at 160 kph and they say: "A clearly determinable but small drag increase due to the presence of the two propeller blades can be seen." If you look at the most current (2018) DAeC (German) handicaps ( https://www.daec.de/fileadmin/user_u...-WO_2018ki.pdf "), the handicap for FES is the same as the base glider, which seems to indicate that the increase in wing loading and the drag of the FES balance, which seems reasonable.
Dan