At 10:39 22 July 2019, 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?

Thank you for help and advice

Possible rubbing of the canopy frame? The plastic canopy will
shrink when the temperature falls after flying for a while, especially
at higher altitudes in the mountains. You may only be able to
replicate the noise on the ground in cooler temperatures.

RO