"Jim Holsenback" <jho### [at] hotmailcom> wrote:
> Expanding on the cone idea .... rib the cone with tori. Afterburning engines
> gable the exhaust nozzle from cylinder to cone-ish shape, and the exhaust
> plume has these bright rings along it's length.

They're not actually rings, but discs.

That's a light effect however (shock fronts in the still burning fuel/air mix),
and not related to the ordinary heated-air blur effect.

The actual heated-air blur should actually extend rather cylindrical, or
actually even taper out a bit (while reducing in blurriness)

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