Editing Space Shuttle Enterprise (section)

==Differences between ''Enterprise'' and future shuttles==
The design of ''Enterprise'' was not the same as that planned for {{OV|Columbia|full=no}}, the first flight model; the aft fuselage was constructed differently, and it did not have the interfaces to mount [[Space Shuttle Orbital Maneuvering System|OMS]] pods. A large number of subsystems—ranging from main engines to radar equipment—were not installed on ''Enterprise'', but the capacity to add them in the future was retained, as NASA originally intended to refit the orbiter for spaceflight at the conclusion of its testing. Instead of a [[Space Shuttle thermal protection system|thermal protection system]], its surface was primarily covered with simulated tiles made from [[polyurethane foam]]. [[Fiberglass]] was used for the leading edge panels in place of the [[reinforced carbon–carbon]] ones of spaceflight-worthy orbiters. Only a few sample thermal tiles and some [[Nomex]] blankets were real.<ref name="SI-Ent">{{cite web |url=http://airandspace.si.edu/collections/artifact.cfm?id=D19860004000 |title=Space Shuttle, "Enterprise" OV-101 |work=SI.edu |publisher=Smithsonian Institution |access-date=January 9, 2013 |archive-date=February 3, 2014 |archive-url=https://web.archive.org/web/20140203141927/http://airandspace.si.edu/collections/artifact.cfm?id=D19860004000 |url-status=dead}}</ref> ''Enterprise'' used [[fuel cell]]s to generate its electrical power, but these were not sufficient to power the orbiter for spaceflight.<ref name="spaceline">{{cite web |url=http://spaceline.org/rocketsum/enterprise.html |title=Space Shuttle Enterprise (OV-101) Fact Sheet |work=Spaceline.org |first=Cliff |last=Lethbridge |year=1998 |archive-url=https://web.archive.org/web/20110107024654/http://spaceline.org/rocketsum/enterprise.html |archive-date=January 7, 2011}}</ref>

''Enterprise'' also lacked [[reaction control system]] thrusters and hydraulic mechanisms for the landing gear; the landing gear doors were simply opened through the use of [[Pyrotechnic fastener|explosive bolts]] and the gear dropped down solely by gravity.<ref name="spaceline"/> As it was only used for atmospheric testing, ''Enterprise'' featured a large [[Pitot tube|nose probe]] mounted on its nose cap, common on test aircraft because the location provides the most accurate readings for the test instruments, being mounted out in front of the disturbed airflow.

''Enterprise'' was equipped with [[Lockheed Corporation|Lockheed]]-manufactured [[zero-zero ejection seat]]s like those its sister {{OV|Columbia|full=no}} carried on its first four missions.<ref name="spaceline"/>