How many Gs Are To Many?

The human body is less tolerant of a negative G's which force blood into the head. Large amounts of sustained negative G's can result in uncomfortable symptoms such as facial pain and readout. Although some experienced aerobatics pilots maybe able to withstand 7 or 8 positive G's before blackout occurs, most will be incapacitated by only -3G's. You can improve your G-tolerance by maintaining good physical conditioning and avoiding smoking, hyperventilation, and hypoxia. Most civil pilot however, will not encounter G-force of sufficient strength during the normal flight to cause any major problems.

What Shape are Raindrops ?

Have you ever think that, what is the actual shape of the raindrops? Well, contrary to popular conception , raindrops don't look like tears. Their real shape depends on the size of the drop. A raindrop will take the shape shown as drop (A) when it is less than about 2 mm in diameter. Larger drops tend to be shaped like (B).

Contrails

Propeller or jet powered airplanes can produced line shaped clouds and it is called Contrails. it is existing combination of high humidity and low temperatures of the atmosphere at high altitudes. It is made mostly of water, which freezes rapidly at those heights to form ice crystals. Depending on the temperature and the humidity, contrails can remain for just a few seconds or for several hours. The airplane’s exhaust produces very little of the actual water in a contrail. Most of the water in a contrail is already in the air as the plane passes through it. (ref:http://www.nasaexplores.com/show_58_student_sh.php?id=030109110655)

Supersonic Balancing Act

Physic of the flying objects involves the interesting problems, and engineers must solve them. One of the most important problem is Balance. Concorde must keep its Central Gravity (CG) with in the certain limits in spite of flight attendants moving heavy serving carts and people walking around inside in. Added to that is the problem that center of lift of the wings moves back several feet as the plane nears the speed of sound, so CG must be shifted along with it. To do this, a system of pumps and fuel lines moves fuel between the fore and aft fuselage fuel tanks.

SMART QUESTIONS: Why concord nose is down when it is landing?

previews Q's answer : nose is down when it is landing, because pilot has to see the ranway...

Faster Than a Magnum Bullet

Most airspeed indicators are calibrated in knots or miles per hour. Airplanes that fly at the speed of sound also are equipped with device which measures airplane's speed in relationship to the speed of sound, or Mach. The Machmeter indicates Mach 1.0 when airplanes is traveling at the speed of sound. Below the speed of sound, indication is given as decimal fraction. For example, flight at %65 of the speed of sound is displayed as Mach 0.65. In comparison, the velocity of a 357 Magnum bullet is approximately 1400 feet per second. This translates to Mach 1.67. X15A-2 is the fastest airplane in the world. It is rocket powered research airplane and top speed is 6.72 Mach. X15A is appr. 5 times faster than Magnum bullet.

SMART QUESTIONS :
Airport taxiway edge lights are identified at night by
a- white
b- blue
c- red