I was not going for a climb test. The time on stop watch included all time from start of engine and was about 7 minutes to takeoff. From 6200 to 8500 or so i would say maybee 300 fpm would not be far off. As i neared 11,000 it was more lijlke 30 to 50 fpm. To many variables and when soaring with the eagles might notice mountain structures, location of flying machine and any winds. The real question is could this be duplicated over wide open spaces with no winds and i believe it could be but would use more time