Very conservative design and primarily as a test bed for oil control to the rotor, and multi-fuel tests. The rotor has a molybdenum spray. the head is nikasil coated. The original Aspin rotors were often lead-beryllium coated.
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| Complete engine | |
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| Head and rotor(s) awaiting coatings |
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| Molybdenum sprayed rotor being ground |
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| Head assembly |