Originally Posted by JackandJanet (Post 25220)

Helmholtz! Sheesh! :disbelief:

Here's a Wikipedia article on it: Helmholtz resonance - Wikipedia, the free encyclopedia

Note near the bottom it talks about reducing drag on aircraft bu 40% using acoustic liners based on the Helmholtz principle. This effect was something I was a bit concerned about when people talked about removing the resonators from intakes. I thought it might induce standing waves in the intake that would hurt its efficiency. I think that is why "drone" is probably NOT a good thing too.
- Jack