in front, which is referred to as a puller system; and a second position in which the motor is in front of the center or gravity with the propeller behind, which is referred to as a pusher system. These solutions improve upon the weight and drag penalties created by the hanging enclosure. In particular, the pilot can be in a prone position hanging from the wing by means of a harness which results in reduced drag.
Unfortunately, mounting the power unit on the keel of the wing gives rise to piloting difficulties which may be dangerous since by definition a hang glider is controlled in flight by the pilot's movements relative to the wing's center of lift. The weight of the fixed motor reduces the effect of the pilot'sin accordance with the Guide for the Care and Use of Laboratory Animals of China. All experiments involving mice were checked and affirmed by the ethics committee for animal care and utilization of the first affiliated hospital of Nanchang University, China.

Behavioral recording
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Every three days, mice underwent the hanging wire test and the weight measure. Mice were trained one week before treated, and data were gathered from 70 days of age. For the hanging wire test, the latency of mice to fall from a wire cage top, which was gradually inverted and suspended at roughly 30 cm to the floor, was utilized as a record of motor weakness. The test was repeated three times to obtain the mean estimation of three trials. The disease onset was characterized by age