 Restoration of the bomber began on 5 December 1984 , at the Paul E. Garber Preservation , Restoration , and Storage Facility in Suitland @-@ Silver Hill , Maryland . The propellers that were used on the bombing mission were later shipped to Texas A & M University . One of these propellers was trimmed to 12 @.@ 5 feet ( 3 @.@ 8 m ) for use in the university 's Oran W. Nicks Low Speed Wind Tunnel . The lightweight aluminium variable @-@ pitch propeller is powered by a 1 @,@ 250 kVA electric motor providing a wind speed up to 200 miles per hour ( 320 km / h ) . Two engines were rebuilt at Garber and two at San Diego Air & Space Museum . The work was slow and meticulous . Every component was carefully cleaned . Some parts and instruments had been removed and could not be located . Replacements were found or fabricated , and marked so that future curators could distinguish them from the original components . 
