On 7/22/19 12:39 PM, gregv wrote:
Hello, I fly a 1979 Nimbus 2 carbon, and since a few years I hear a cracking noise behind me. That noise occurs more often after a few hours of flight, maybe related to temperature change with altitude. You can hear the cracking noise in this video:

https://www.youtube.com/watch?v=pke-...ature=youtu.be

Did you already hear that noise? how do you think I can fix this ? do you think it is dangerous?

I used to fly a Nimbus, original II (without b or c). It was noticeably
noisy but maybe not the same sounds as yours. I would start by looking
for the obvious, check every piece of tape on the glider, over joints,
control surface hings and U/C doors etc.