Abstract
This paper describes the directional stability of the tumbling plate by measuring the trajectory of a paper piece that is shaped systematically. The tumbling phenomenon is considered to be an important phenomenon for aircraft flight safety because of the possibility of falling objects from the aircraft reaching far away. Therefore, this paper presents the result of measuring the trajectory of six configurations which shows that Concave configurations have directional stability while the Convex and Rectangular configurations are unstable. For generalization, the experimental result deducted using generalized equations into dimensionless values. Qualitative consideration is given to the relationship between the stall delay caused by sudden pitch motion and the phenomenon of the increase in the maximum vertical force coefficient (so-called Dynamic Lift), and the consistency with the dynamic lift wind tunnel test is shown.
Highlights
We often see leaves and thin pieces of paper falling while rotating in the air
The directional stability of tumbling objects has an important influence on the range reaching on the ground of falling objects, which is said to be common when landing gear down in approaching airports where the glide path is set above residential areas, and it is considered to be an event that has a significant impact on flight safety
As the result, (a) It was found that the shape having stability with respect to straight running was a concave configuration within the configurations (Fig. 1)
Summary
We often see leaves and thin pieces of paper falling while rotating in the air. We deal with tumbling in which vertical drop direction and rotation axis are in a vertical position. Tumbling is an important phenomenon in aerospace engineering and ballistics, as a purely academic interest in the falling motion of tree leaves and thin paper pieces and as a prediction of the scattering range of fallen objects from air vehicles. The directional stability of tumbling objects has an important influence on the range reaching on the ground of falling objects, which is said to be common when landing gear down in approaching airports where the glide path is set above residential areas, and it is considered to be an event that has a significant impact on flight safety. It is desirable to drop something close to the root of a plant, such as a leaf, to make nutrients, and some of them have a
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