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The Phugoid Theory
§ 23
The radius of curvature is now negative for all values of H1. The signification of this fact will be better understood in the light of the subsequent chapter when the actual curves have been plotted.
It may be noted that in order that cos Φ should be = −1 the aerodone must be launched upside down, the same "hand" must always be kept towards the supposed observer. If the aerodone were launched in the reverse direction the right way up this latter condition would be infringed.
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