Duane Bozarth wrote:
Joseph Meehan wrote:

...
Yet isn't the spring's function to neutralize this force? The
spring overcomes this to negate the user or mechanical opener from
having to deal with the full weight and inerta of the door.

Well it means it does not have to deal with the full weight of
the door, but the inertia is still a possible problem. ...

It'll divide w/ the relative weight carried by the spring as well...as
far as the motor knows, the door only weighs as much as the weight not
carried by the springs in the fully closed position.

No I am sorry but the inertia is not reduced at all by springs. The
springs can carry the weight of the door, but it does not change the mass of
the door and it is the mass that the problem I was talking about.

However as I said, based on your description of the door, it would seem
to be within the norms for a consumer door and should not be a problem.

--
Joseph Meehan

Dia duit