Testing stand for Vickers machine gun with synchronising gear as fitted to aeroplane.

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Is it electrically synced? I always assumed they had a mechanical linkage of some sort

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You are correct, the gear was all mechanical. The electrics here are most likely just to spin the prop prop.

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Prop prop, hehe funny

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Maybe the electric stuff is just for that propeller for testing? I was pretty sure you are right and the interruption gear was all mechanical

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