In aerodynamics, the rate of climb RoC is the speed at which an aircraft increases its altitude. Altitude is the Elevation of a point or object from a known level or datum (plural data In the United States, this is most often expressed in feet per minute and can be abbreviated to ft/min. The United States of America —commonly referred to as the A foot (plural feet or foot; symbol or abbreviation ft or sometimes &prime – the prime symbol) is a non-SI unit A minute is a Unit of measurement of Time or of Angle. The minute is a unit of Time equal to 1/60th of an Hour or 60 Elsewhere, it is commonly expressed in metres per minute, abbreviated as m/min. The metre or meter is a unit of Length. It is the basic unit of Length in the Metric system and in the International A minute is a Unit of measurement of Time or of Angle. The minute is a unit of Time equal to 1/60th of an Hour or 60

The rate of decrease in altitude is referred to as the rate of descent or sink rate.

There are two traditional airspeeds for most aircraft relating to rates of ascent, referred to as Vx and Vy.

Vx refers to the "best angle of climb speed,"FAR which is usually less than Vy, the "best rate of climb speed. "FAR The difference between these speeds relating to the rate of climb lie in the climb objective.

Climbing at Vx will allow a pilot to maximize the vertical speed per unit ground distance. That is, Vx will allow you to maximize your climb while sacrificing the least amount of ground distance. This occurs at the speed for which the difference between thrust and drag is the greatest (maximum excess thrust). In a jet airplane, this is approximately minimum drag speed, or the bottom of the drag vs. speed curve. Climb angle is proportional to excess thrust.

Climbing at Vy will allow a pilot to maximize the vertical speed per unit time. That is, Vy, will allow you to maximize your climb while sacrificing the least amount of time. This occurs at the speed for which the difference between engine power and the power required to overcome the aircraft's drag is the greatest (maximum excess power). Climb rate is directly proportional to excess power.

The indicated airspeeds of Vx increases with altitude and Vy decreases with altitude, indicating that Vx = Vy at a certain airplane's absolute ceiling. Indicated airspeed (IAS is the Airspeed read directly from the Airspeed indicator on an aircraft driven by the Pitot-static system.

The initial rate of climb record for pilot aircraft is held by Mig-29 at 330 m/s (65,000 ft/min). WikipediaWikiProject Aircraft. Please see WikipediaWikiProject Aircraft/page content for recommended layout The average rate of climb for a MiG-29 is only 109 m/s 0-6000 m. [1]

## References

1. ^ http://www.flug-revue.rotor.com/frtypen/FRMiG-29.htm