About 7 years ago I was walking out my front door carrying a pair of
binoculars. Suddenly, boom, boom, boom, boom...4 sonic booms in a row. I
looked west and saw a very high altitude dot that rapidly went over the
horizon. Following it was a faint, odd looking contrail looking like this:
....0......0.....0......0.....0.....0...... Big puffs separated by thin
wisps. I believe I saw what you're talking about
I believe that Avaition Week referred to the strange contrail and theorized
it was a result of a PDE (pulse detonation engine, not PDA). It even had a
photo of the contrail you referenced. kshewbart_at_hotmail.com[1]
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