![]() ![]() Įnterprise also lacked reaction control system thrusters and hydraulic mechanisms for the landing gear the landing gear doors were simply opened through the use of explosive bolts and the gear dropped down solely by gravity. Enterprise used fuel cells to generate its electrical power, but these were not sufficient to power the orbiter for spaceflight. Only a few sample thermal tiles and some Nomex blankets were real. Fiberglass was used for the leading edge panels in place of the reinforced carbon–carbon ones of spaceflight-worthy orbiters. ![]() ![]() Instead of a thermal protection system, its surface was primarily covered with simulated tiles made from polyurethane foam. 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. The design of Enterprise was not the same as that planned for Columbia, the first flight model the aft fuselage was constructed differently, and it did not have the interfaces to mount OMS pods.
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