It would help if they had added a larger vertical stabilizer / rudder to combat the massive adverse yaw created by the ailerons on those old WWI planes.
When you deflect the aileron downward, you're increasing the angle of attack of that section of the wing, which creates lift as well as drag. It's the drag that produces a yawing moment, which tries to pull the wing back paralell the flight path, and is the reason the nose initially yaws in the direction opposite of your roll control input - so you combat this with the application of rudder. The more aileron deflection you have, the greater the adverse yaw. It's more pronounced at slow speeds and high angles of attack because the vertical stabilizer loses its ability to dampen the yaw as a result of the reduced airflow over its surface.
Also, aircraft with longer wingspans experience more severe adverse yaw because the drag force is being applied further away from the center of gravity - so it produces a greater moment of inertia - sailplanes are a good example.
BTW, I thought that many of those WWI airplanes didnt have a throttle control, it was either mags on or off?
