Looks like 2-4% to me from the L/D diagrams. Very significant. Handicap committee?

Sean

On Monday, February 24, 2014 9:48:51 AM UTC-5, Renny wrote:
Based on some previous postings on the FES and the questions regarding the drag effects of the FES propeller blades, attached for everyone's info is a URL to the final Idaflieg FES testing report dated Feb 21,2014.



http://www.front-electric-sustainer....A%20FES_en.pdf



Keep in mind that this evaluation was done on a LAK-17a FES. For new LAK gliders FES installations at the LAK factory are being done on the LAK-17b and more recently, an FES installation was done on a LAK-19.



As many of you are also aware, the FES is available on the Alisport Silent 2 Electro.



Thx - Renny