what is that noise?

On Monday, July 22, 2019 at 6:39:11 AM UTC-4, gregv wrote:
Hello, I fly a 1979 Nimbus 2 carbon, and since a few years I hear a cracking noise behind me.

Count your blessings. I have a howling banshee in my tail boom.

On Monday, July 22, 2019 at 7:29:40 AM UTC-7, son_of_flubber wrote:
On Monday, July 22, 2019 at 6:39:11 AM UTC-4, gregv wrote:
Hello, I fly a 1979 Nimbus 2 carbon, and since a few years I hear a cracking noise behind me.

Count your blessings. I have a howling banshee in my tail boom.

Flub, what are you flying. I removed the V seals in my Nimbus 3 rudder one year and the banshee took up residence at speeds over 90 kts. Once they were replaced, the banshee was banished.

Cheers,
Craig JN

The howling in the tail boom might be from air pressure coming in and it doesn’t have a escape.

You can try leaving the wing tape off at the trailing edge about one inch. It helped on my Lak.
W7

On none removable lift pins, the shins are lightly glued on to the fuse wing fillet with contact cement or similar.
Be warned, too tight shims can make rigging very difficult in hot weather.

My Libelle has a floating shim on one of the lift pins and I'm afraid it will slide off and get lost during assembly/disassembly. Sounds like cementing it on may be the trick.

On Thursday, August 1, 2019 at 6:42:11 PM UTC-5, Charlie Quebec wrote:
On none removable lift pins, the shins are lightly glued on to the fuse wing fillet with contact cement or similar.
Be warned, too tight shims can make rigging very difficult in hot weather.