I did some testing with my new windsurfers. I flew from the park to my house which is about 2000' then wanted to see how far I could really go. Without my windsurfers I'm getting 2000' and with them I only made it 2600'. I am surrounded by neighborhoods and trees that are about 50' high. My test elevation was about 200'. I was hoping for at least a mile. My next test will take place out in the middle of nowhere. Hopefully I will get better results.