Discussion
Which feature allows a constant mesh gearbox to use helical teeth?
Answer: A
Because the gear pairs remain permanently meshed and selection is made by a dog clutch, the teeth never have to slide into engagement and can be helical for quiet running. Sliding mesh required straight cut teeth. This is the principal reason constant mesh superseded the earlier arrangement, quite apart from the ease of selection. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb.
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