NOTAR(NO Tail Rotor)
Antitorque by using airflow
More expensive but less noise
Coaxial Helicopter (concentric or located along the same axis)
Coaxial Helicopter use Two shafts.
Each shaft rotate opposite direction.
→anti-torque
High Useful Load but complicate rotor design
Problem 3.52
One of the tail rotor blade of a helicopter has an unbalanced mass if m = 0.5
물체가 현재하고 있는 운동상태를 지속하려고 하는 성질. 타성이라고도 한다. 예컨대, 정지계(靜止系)에 대해서 어떤 속도로 운동하고 있는 물체는 언제까지나 같은 속도로 운동을 계속하려 하며, 정지하고 있는 물체는 언제까지나 정지를 계속하려고 한다. 즉, 전차가 움직이기 시작할 때 승객의 상체
Ⅰ. INTRODUCTION
In fourth semester most of our department students attend the subject of mechanical manufacturing practice and we have made a bolt by ourselves. But the process was not a soft job. A bolt and nut is used diversely but it seemed that we don't know much about a importance and manufacture of bolts.
A bolt is a threaded fastener used in industry to make two or more mechanical
torque type hat.
Veil which began in the culture of Persian and Mesopotamia is propagated to Islam, veil culture of Islam was born. Initially Veil has been accepted by some area. In the middle ages, Islam is institutionalized and expressed to wear veil in 『Quran』, has changed as a symbol of the relationship between men and women. 『Quran』is mentioned a woman's veil in the following manner
Blackness. Then a hint of green becomes EARTH. It lies across an expanse of space. Richly colored. Fertile.
A GIGANTIC ASTEROID cuts into frame, Burning into EARTHS ATMOSPHERE and striking down in the currant area of Guzumel, Mexico.
Voice : An impact equivalent to ten thousand nuclear weapons detonating simultaneously.
A HUGE DINOSAUR FOOT steps down hard and is VAPORIZED with a deafening ROAR.