Originally Posted by
hoodie
What is the fatigue issue with a composite airframe?
I have no idea why such a limit. We have K21 gliders where I fly and they do about 500 hours per year, which will be many more launches than 500 as almost no training flight is as long as an hour. Indeed quite a few are a couple of minutes or less. (practise cable breaks)
K21s can now be relifed to 18,000 hours.
And whilst these are not K21s, they don't have substantially lower life limits.