Re: Sergent Couplers

Tim O'Connor

Larry, I appreciate that prototype couplers do close from
jostling and vibration etc. But gravity acts on the mass of
the coupler and the friction of scale model knuckle scales
as the inverse square of the size -- in other words the
scale friction is 87 times more effective than it is on the
prototype. This means you have to hit the car pretty darn
hard to jostle the knuckle closed on the other end. The
Sergent knuckles will no doubt sometimes close but I
think "Bull Heads" will be less common in HO scale. And
the frequency may even be equal to the number of times
we now have to deal with missing Kadee springs or
failed McHenry's or Accumates stuck open.

Tim O.

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