飛機在飛行過程中，有時飛機油壓控制系統失效或飛機機具結構故障，導致飛機主控制面失效，進而釀成災害。若有其它系統可以有效地代替失效的控制面，也許可以避免這些意外的發生。故本論文主旨在探討利用油門推力軸與重心軸的不同高度，使得引擎推力的改變將會產生俯仰運動，並以此俯仰運動來控制飛機的縱向運動飛行。在此以莫霍克飛機為研究對象，並且利用計算軟體來模擬飛行路徑。首先，推導出飛機的六個運動方程式，建立飛行軌跡與油門推力之間的關係，再以迴授控制器來控制飛機的飛行高度，最後，再測試升降舵鎖死在某一固定角度故障後以及有垂直陣風干擾時，是否能只靠油門推力，使飛機恢復初始高度並且維持平飛狀態，以及在油門推力有極限的條件下，找出容許升降鎖死角度的範圍以及垂直陣風風速的範圍。

During the flight, main control of planes may go out of order and further lead to disasters partly resulted from failure of controlling system of oil pressure or malfunction of equipment structure of planes. If there are other systems which can effectively replace the controlling plane out of order, the accident may be avoided. Under this circumstance, this paper aims at doing research on the adoption of different height of thrust shafts and gravity shafts of accelerators to promote a pitching motion of thrust of engine when changing, which will then be used to control longitudinal flight of planes. This paper takes Mohawk as its subject and applies computation software to simulate flight path. Firstly, infer six equations of motion of planes and establish relationship between flight path and thrust of accelerators. Secondly, control planes’ flight height by giving feedback to controllers. Finally, test whether elevators can maintain a horizontal flight and regain the original height of planes only by thrust of accelerators when elevators are broken at a fixed angle and disturbed by vertical gust wind and find out the range of angle tolerating moving of elevators and wind speed of vertical gust wind in the condition that thrust of accelerators is limited.

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