DTIC (Defense Technical Information Center), 2026-10-04

URLs tried: https://apps.dtic.mil/sti/pdfs/ADA227121.pdf (curl returned a 1.5 kB HTML page, not a PDF; deleted) and https://apps.dtic.mil/sti/citations/ADA227121 (Chrome redirected to https://apps.dtic.mil/landingpage/maint.html, "Under Maintenance"). Result: blocked (site under scheduled maintenance). Recheck: yes.

Target: D. L. Cravens (SAIC), Electric Propulsion Study, Final Report AL-TR-89-040, contract F04611-88-C-0014, USAF Astronautics Laboratory, Edwards AFB, August 1990. DTIC accession AD-A227 121. The report number and accession are from the Google result for the Academia.edu copy and from the citation in Choi 1992, DTIC ADA248649 [web] https://apps.dtic.mil/sti/pdfs/ADA248649.

The full study's sec. 3.7 "Non-Inductive Coils" discusses Hooper and proposes a test. Only an excerpt has been seen (rexresearch). Alternative copy: Academia.edu, "Electric Propulsion Study" (not visited).