Ian wrote:
On 2 Jul, 15:44, Michael Ash wrote:
Ian wrote:

If the downforce on the tail has increased, and you're in a steady
state, then the upforce on the wing must also have increased to
balance it.

If you're in a steady state, then the forces on all the surfaces will be
the same.

Almost. Both the forces and the moments will sum to zero, so there are
six equilibrium conditions to satisfy. The force on the wing isn't
equal to teh force on the tail, since they have (jointly) to balance
gravity as well.

My apologies, my wording was ambiguous. What I meant was that the net
(vertical) force on the wing at 50kts is the same as at 100kts, and the
net (vertical) force on the elevator at 50kts is the same as at 100kts. I
didn't mean to imply that the force on the elevator was the same as the
force on the wing, but I can see how it would read that way.

Your proposed balance doesn't work out because the wing and the elevator
aren't in the same horizontal position. An increased downforce on the tail
and upforce on the wing creates a twisting motion, which will raise the
nose.

Ah. Do you know why a downforce on the tail is needed for a dive?

I'm not sure which downforce you're referring to here. If you mean the
need to keep the stick forward, that's to compensate for the changed angle
of attack on the elevator.

But
the end result is the same vertical forces on the wing and elevator at all
speeds.

Have you ever compared the size of wing and tailplane fittings?

Presumably the same misunderstanding as above.

I should note that my background in all of this is just a couple of
semesters of college physics combined with not a whole lot of flying
experience and some inquisitiveness.

--
Michael Ash
Rogue Amoeba Software