"My understanding is that the high arches restricted the flow."
I don't think that is right.I think a high arch mower is less restricted than a low arch mower for a greater flow rate of cut grass.(the grass cuttings are discharged at as high a level as possible to ensure the maximum capacity of the catcher is utilized.
As speed increases, i.e: accelerate, then the RATE at which the air molecules hit the object per second increases, this results in an increase of force. This force is only in linear to SPEED though, so as it goes faster, this drag increases.
For low speeds (slow enough not to cause turbulence), air resistance is proportional to the first power of velocity. If turbulence is generated, drag force is proportional to the square of relative flow velocity with respect to the object. ..
The fluid momentum is equal to the mass times the velocity of the fluid. ... The velocity used in the lift and drag equations is the relative velocity between an object and the flow. Since the aerodynamic force depends on the square of the velocity, doubling the velocity will quadruple the lift and drag.
The force of gravity upon a traveling object is strongest when parallel to the Earth.
The drag on the grass clippings is greater with the low arch mower base.
This golf graph shows how different angles will increase or decrease drag. (trajectory graph)
That's how I see the high and low arch mowers but happy to be corrected if I have something wrong.
