I've never tested engine out glide, but I also plan with 1000 ft/min. And if you assume a 10:1 glide ratio, you can glide 10,000 fpm, or 1.65 nm or 1.9 sm per 1000 ft. of altitude. When I do test flights, I try to stay within 1 nm of the airport for each 1000 ft of AGL. For example, 5000 ft AGL, stay within a 5 nm radius. Easy with GPS.

Finn Lassen wrote:

Engine stopped is different from engine idle approaches. At least in my RV-3. During my most recent engine out, I took time to look at rate of decent at best glide speed. Close to 900 ft/min. I think at idle it's about 700 ft/min. So to plan 1000 ft/min is a good number.

Finn