Stator port "lips" sharp vs squared

[Robert Gift]

Sharp opening "lips" ==> <==,
or
squared ==] [== edges
What differences do they produce?

[SirenMadness]

Are you referring to bevelled edges on each side of a stator port? If so, there wouldn't really be a difference in sound because having such a design of port just saves weight.

[Robert Gift]

Are you referring to bevelled edges on each side of a stator port? If so, there wouldn't really be a difference in sound because having such a design of port just saves weight.

I bet it does make a difference in harmonic content.

[SirenMadness]

Even the thicker stators are not thick enough to cause a major difference in the sound's propagation from the siren, so putting a slight bevel on the edge of a port won't make a difference in harmonics up to a point at which it would make the siren quieter at a hundred feet by even a Decibel, possibly.

[Robert Gift]

I'm not referring to efficiency.
More to harmonic content. Waveforms.
Sizzle.
My 2t22 has beveled stator lips.
But I have seen photos of other sirens with squared lip edges.
And the Banshee with beveled openings forming short projectors.

Would be interesting to see the waveforms and hear the differences.

[SirenMadness]

I think that the sound form would pretty much be the same, as at a high pressure, the air exits the stator so fast that about a centimeter extra of stator wall would not really make a difference, so the sound would pretty much sound the same.

[Robert Gift]

I'd also love to know the pressure created by the rotor.

When first operated and standing about 18 feet away, I felt Lassie's breath from her naked stators!

Maybe next January 5th, I'll attach ribbons to her lower ports and watch how far out they extend.
I may be able to fabricate a single rectangular port opening cover, held in place by the projector cone attachment screws, connected to a pressure gauge to obtain a static pressureading.

[Daniel]

Those Greek-made sirens look like an E-57 but have angled rotor blades and normal stator ports. Perhaps that would change the sound somewhat.