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Project HARP
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==== Martlet 3B ==== The Martlet 3B was similar to the Martlet 3A but using steel casings and attempting to solve some of the 3A model's other problems. The casings survived {{convert|5100|ft/s|m/s}}, but the propellant failed at {{convert|3400|ft/s|m/s}}. This was solved for later rockets by filling the propellant cavity with liquid, but only after developing the 3B model had ended.<ref name="astronautix2" />
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