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Old April 25 2010, 10:22 PM   #9
Mytran
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Location: North Wales
Re: Nacelle rear spheres: conjectures.

Perhaps the balls are always there, covering the vent. However, due to the translucent substance they're made from they're sometimes opaque, sometimes transparent - it depends on how the light falls.

Now, anyone care to have a stab at the changeable impulse vents?
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