Hi Scott,
Talked to the builder now. He confirmed that the plans state like you say. To be used for defogging or to get heat out.
The builder has wired them permanently on. Oops. It seems then that it is not a good option. I will disconnect them before the next flight and I will also try to take pictures and post it here in order for all of us to learn. I think might be possible to polish out what I see and feel there.
I am also thinking that one should have a reflector directing some of the air away. I have an STL file for my 3D printer that I intend to us on the RV10 that I am busy with. It will have a switch
By the way - I find it hard to land as I want to keep on flying it

20.3 hours as of this morning.
__________________
Jan Hanekom
South Africa
Approved Person nr 325
http://www.rvbits.com
RV10 - ZU-XOX - (Flying)
RV7A - ZU-JRV - (Flying)
RV10 - ZU-JVR - (Written off)
RV7 - ZU-LOL - (Flying)
RV10 - ZU-RVI - (Flying)
RV7A - ZU-MER (Bought back)
RV7A - ZU-JAD (Sold Flying)
Dues paid for 2020 WITH A SMILE