# Why does an aircraft fly a looping when pulling the stick?

let's assume an aircraft flies in straight level flight in the direction of an x-axis with an angle of attack of 3°. When the pilot pulls the flight stick, an additional lift is produced which acts perpendicular to incoming air direction. But in order to fly a looping, the lift force should always be perpendicular to the body axis/attitude of the aircraft?

So the thing is, to my understanding when we increase the angle of attack, the lift force increases (drag also increases a little bit). This should only mean that the aircraft climbs now, but the attitude or to be precise: the aircraft flies still into the x-direction but has now also an y-component (altitude). But there must happen something with the forces so that a pilot can fly a turn.

Thanks for your help in this!

Lucas

• You forgot to consider what directly happens when you pull the stick (which is not producing additional lift with the wing) 😉 Jan 27, 2023 at 10:27
• Dou you mean: When I pull the stick then "directly" the tail goes down and the nose up. Jan 27, 2023 at 13:14
• Consider: looping always involves pulling the stick back (well, could think of a few exotic exceptions such as a very rapid roll to wings-level from a steep fast spiral dive, but that's the general rule), but pulling the stick back doesn't always make a loop. Hmmmm.... Jan 27, 2023 at 13:29
• Yep, your tail goes down (i.e. the nose up) and you gain incidence. Afterwards it's just a matter of equilibrating the forces acting upon the aircraft. Jan 27, 2023 at 14:06
• In any turn, forces do not equilibrate. As you pull the stick back, your nose changes direction. A loop is a turn in the vertical. As you turn, the wing is constantly pulling in a new direction. As @quietflyer said, the physics are similar to a level turn, but you need enough energy to turn past 90 degrees vertical, of the plane will fall backwards. In considering what an elevator control input does, it is a rotational torque about the pitch axis and a change in direction of the plane. Jan 27, 2023 at 16:13