How about turning this around? If say a Global Hawk had landed somewhere in 1947 what could have been reverse engineered from it? As a Global Hawk is presumably much less advanced than an alien space ship, built by humans, and for this scenario it would have landed safely rather than crashing reverse engineering it would be far easier than from a crashed alien vehicle.

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"Any Sufficiently Analyzed Magic is Indistinguishable from SCIENCE!" -Agatha Heterodyne

"Any technology, no matter how primitive, is magic to those who don't understand it." -Florence Ambrose