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Despite being more prone to rollovers than cars, large vans, as well as large S.U.V.'s, are not subject to many car regulations, including minimum roof strength requirements.
Instead of halting the launching on the spot, Mr. Rocha said, the shuttle manager, Linda Ham, granted a temporary waiver that reduced the strength requirements, on the basis of data that the investigation board later found to be flawed.
SpaceX, founded by Elon Musk, a tech entrepreneur, revamped the design of the strut and its manufacturing process; it now individually tests every strut to ensure that each meets strength requirements.
That afternoon, he and other engineers were stunned to learn of new tests at a NASA laboratory showing that a ring attaching the rocket boosters to the external tank had not met minimum strength requirements.
S.U.V.'s and other light trucks are permitted to consume substantially more gasoline than passenger cars and the heaviest ones, like Hummers and Toyota Sequoias, can qualify for enormous small business tax breaks and are exempt from minimum roof strength requirements.
Strength requirements are also considered as constraints within the optimisation.
Therefore, the SLM titanium alloys can meet the tensile strength requirements for engineering applications.
Water content and drying time should be controlled to meet the strength requirements of similar material.
It was up 54% in the previous six months, so it also met my relative strength requirements.
Moreover, several mixes have met the minimum Illinois Department of Transportation compressive strength requirements.
