Scale wind-tunnel models are usually designed for one task, to collect data on the ground under strictly controlled conditions. But now that Lockheed Martin has completed low-speed testing of its Hybrid Wing Body (HWB) airlifter, it plans something unusual—to fly the same model as an unmanned aircraft. The February tests of a 4%-scale full-span model in Lockheed Martin’s low-speed wind tunnel in Marietta, Georgia, complemented evaluation of a same-scale half-span HWB in August ...

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