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In one well-known example of this fact, the Crow Instability causes the vortices to develop symmetric sinusoidal oscillations and eventually to merge and form vortex rings behind the jet. This instability can be triggered by turbulence in the surrounding air or by local variation in air temperature or density, which may itself be the result of the stratification of the atmosphere. When the contrails are visible and strong, it is possible to see the white streaks become wavy and then leave rings floating high in the sky, like smoke rings from a giant cigar.
Originally posted by christopherledwards
What if the "pulses" are actually holes punched in front of the plane to displace the air to negate the friction/heating due to air?
Originally posted by Nohup
The design of a pulse jet engine is theoretically so simple, I've often toyed with the idea of building one for a model plane. Not as high-tech as a scramjet or anything, but something more along the lines of a V-1 Buzzbomb engine. Simple forced induction with timed combustion chamber closure/ignition.
If it didn't just blow up, it sure would be nice and noisy, and maybe a bit faster than most of the other model planes everyone else would be flying.