Normally the ratio of rudder to tilt for a turn is fixed for a given aircraft. The main reason is that people are ok with experiencing downward forces, but not

Normally the ratio of rudder to tilt for a turn is fixed for a given aircraft. The main reason is that people are ok with experiencing downward forces, but not so much with sideways forces. As a pilot, if you want to keep the forces downward, you need to use both rudder and tilt in a particular combination. In order to make a turn you also really need a tilt - if you use only the rudder you are in a "slip", you don't really change your direction of movement but the direction of movement and the front of the plane are not aligned (actually it's more complicated and the rudder will initiate a tilt as well but I won't go there). From what I understand, the problem with this particular kind of design is not so much about the direction of the forces but about the variation in forces though. If you're sitting in the end of a wing, as the aircraft goes into or out of a tilt you will experience quite some variation in the magnitude of the downward force, which is uncomfortable.