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In town, at lower speeds, the wipers are fine. I imagine the flow of
air up the glass at higher speeds counteracts any increase of pressure on the
arms themselves, so the blades float over the glass. One sees little vanes
that can be attached to wiper arms to increase the wind pressure
on the arms, but they look kind of trashy, a "go-fast" addition
substantially at odds with Imperial-ness.
As D^2 mentions, Rainex works really well above 30 MPH, so you kind of get
the best of both worlds. I once removed, then replaced, the
springs but did not spend any time looking for a replacement.
On the 58, with its huge double compound windshield and both wipers working
from the outside in, one ends up with a very odd cleared pattern anyway, with a
great big section in the center of the glass left untouched. This can be
most disconcerting on misty days. Another "not so good" design element,
I'm afraid, or is it heresy to say these cars are less then perfect? I
hope not!
Hugh
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