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Originally Posted by gestrich19
horizontal lift changes the direction of motion (flightpath)
Reread this a few times and really think about it: Is "horizontal lift," in this discussion, a force?
Did you have an answer?
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Ok now let me give you a briefing on vectors. Lift is a force, actually a vector component of aerodynamic force, but we can ignore that. When you divide up a force into its relevant vector components, you are determining the directional application of that force. These directions will be split into, for this discussion, the X and Y axis.
For instance, if we place a block on the table and push on it, perpendicularly with another block, we have now applied a force. This force would have no vector components. However, if we push on that same block, this time at 45 degrees, it will have two vector components. One component on the X and one on the Y axis.
In that second application, at 45 degrees, we are left with an x force and a y force. Similarly, when lift force, in a bank, is broken up, we have a vertical (y) force and horizontal (x) force. Like the block, moving at an angle from these two separate forces, the aircraft will do just the same.
So the answer to the question is, yes horizontal lift is a force. While it is merely a vector component, and not the actual force itself, it has the same properties of any force. That is, it causes some action to happen. Since we know a force causes an action to happen and we know the horizontal force exists then we know the aircraft will turn (the action) because of it.
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There needs to be something to turn the aircraft around the vertical axis and horizontal lift by itself will not move the aircraft in a circle.
No there doesn't and a simple experiment can prove it. Take one of your model aircraft and make it fly around a turn while looking at it from a birds eye (top down) view. Do you see any rotation around the vertical axis? If you are doing it coordinated, you won't.
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The change in the relative wind due to horizontal lift causes a side force to act on the side of the aircraft (behind the c.g.) which causes the plane to turn into the relative wind around the vertical axis.
You keep repeating this, stop. It is wrong. Consider this: by your definition, a B2 (flying wing) wouldn't be an non-flyable aircraft. We both know that isn't true.