Some of the readers here may be interested in the subject of honeycomb usage in aircraft jet engines. The machine I talk about in the previous post is used to manufacture honeycomb material.

Here is a picture of an internal engine part called a labyrinth seal. Notice how honeycomb material is wrapped around the inside of the outer part. It is normally brazed in place and made of very very thin material. It presents a very low percentage surface area ratio to the mating part which is the ridges on the inner part of the assembly. Sealing occurs because there is nearly surface to surface contact between the top of the honeycomb material and the ridges of the internal part which rotates with respect to the outer part.



Here is another picture of a part of an engine that seals the ends of turbine blades:



You can read some about the above picture in this document link.

Michael Karas