Vortigern99
Sorcerer Supreme
Why do you think that the viewing conditions for seeing the lower fin are worse than for seeing the upper fin - which is not very far above the lower fin? They're both at the same distance from the observer. Do you think that the atmospheric and lighting conditions change that much over a distance from the upper to the lower half of the object, and if so, why? At what distance would the lower fin be invisible while the upper remains visible?
As a semi-professional illustrator and degreed artist, I've observed and painstakingly recorded light and light phenomena for many years, and I can confidently report that bright sunlight can "blow out" (render invisible) a distant, reflective object, while another object adjacent to the first will remain visible.
Material reflectivity, angle of view, position of the object viewed, and distance between viewer and object are all relative to each other and to the light source, and all affect visibility. Behind a sheen of brilliant, reflected sunlight, not much detail is going to be visible to the naked or even the binocular-assisted eye. But an object just outside that globe of light, might be visible.
In short, the unseen lower fin and gondola may have been composed of highly reflective material; they may have been positioned at an angle favorable to brilliant reflectivity;they may have been subsumed by the sphere of reflected light shimmering off the surface of the (proposed) blimp, while the sighted upper fin was none or not all of these.
The fallacy you're making here is argument from incredulity, as GeeMack has repeatedly noted and you have consistently ignored. You personally cannot imagine how obvious blimp features, such as the lower fin and gondola, could possibly be overlooked or misperceived by a competent viewer. The simple fact is that light, distance and atmospheric conditions affect and distort visual perception in unpredictable ways, as do the less tangible psychological phenomena of regional expectation, confirmation bias, wonder and awe, and emotional attachment to unsupportable premises.
BTW, you neglected to address my other points, namely the USNR and commercial blimp hangars in operation well within range of RR; that the round/circular shape of the UFO is wholly consistent with the head-on view of a blimp; that the cigar-shaped drawing made by one eye-witness, which you yourself have described as "precise", is further evidence that a blimp could have been involved.
Nor have you spoken to the possibility that the RR UFO, among other UFOs, could be explained as a covert experimental military aircraft designed and flown by the US Army or Navy, but kept under wraps as military secrets often are. This is a simpler, more rational, more plausible and more probable explanation than "alien aircraft from some world or experience beyond human knowledge or understanding".
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