Contents

- 1 How is VX calculated?
- 2 What is VX in aviation?
- 3 What is VX in a Cessna 172?
- 4 What is VX poison?
- 5 Does VX change with weight?
- 6 How do you calculate pressure altitude?
- 7 Why does VX increase with altitude?
- 8 What is best angle of climb?
- 9 What is the normal rate of climb on a Cessna 172?
- 10 What is the landing speed of a Cessna 172?
- 11 How fast does a Cessna 172 need to go to take off?
- 12 What is VX and VY in physics?
- 13 What’s VY speed?
- 14 What is VR speed in aircraft?

## How is VX calculated?

Vx is all about excess force (thrust) – but Vy is all about excess power (horsepower). So, you can compute power required by multiplying your total drag (force required) by your airspeed (distance over time). Power Required = Thrust Required X Airspeed.

## What is VX in aviation?

VX is the speed at which the airplane achieves the greatest gain in altitude for a given distance over the ground. It is usually slightly less than VY, which is the greatest gain in altitude per unit of time. The specific speeds to be used for a given airplane are stated in the FAA-approved AFM/POH.

## What is VX in a Cessna 172?

There are two climbout speeds that we aim for when we’re taking off: best angle of climb ( VX ) or best rate of climb (VY). The PTS stipulates that you use the best rate of climb (VY) for a normal or crosswind takeoff.

## What is VX poison?

VX is an extremely toxic synthetic chemical compound in the organophosphorus class, specifically, a thiophosphonate. In the class of nerve agents, it was developed for military use in chemical warfare after translation of earlier discoveries of organophosphate toxicity in pesticide research.

## Does VX change with weight?

Vx and Vy change as DA goes up and change with weight. For every 1000′ increase in altitude Vx increases approximately 0.5 mph and Vy decreases 0.66 mph. Also remember Vx & Vy speeds decrease as weight decreases. Vx and Vy can be reduced ½ of the percent of weight reduction.

## How do you calculate pressure altitude?

To calculate pressure altitude without the use of an altimeter, subject approximately 1 inch of mercury for every 1,000-foot increase in altitude from sea level. For example, if the current local altimeter setting at a 4,000-foot elevation is 30.42, the pressure altitude would be 3,500 feet: 30.42 – 29.92 = 0.50 in.

## Why does VX increase with altitude?

Therefore, dropping straight down from the tangent point (point A) to point B, we find that the best angle of climb speed has increased to 75 knots. And this is the basic reason why Vx increases with altitude.

## What is best angle of climb?

Best Angle of Climb speed (V_{x}) gets you the greatest altitude per unit of ground distance (feet per mile). When you’ve got a FAA-Standard 50-foot-tree at the departure end of the runway you’ll aim for the best angle of climb to ensure you don’t wind up in the tree.

## What is the normal rate of climb on a Cessna 172?

The Cessna 172 is a four-seat aircraft. At maximum weight it has a V_{Y} of 75 kn (139 km/h) indicated airspeed providing a rate of climb of 721 ft/min (3.66 m/s).

## What is the landing speed of a Cessna 172?

The 172S POH recommends 61 knots for a final approach speed for a short field landing, which is 9 knots faster than 1.3 X Vso. As for the Cirrus SR22T, they recommend 80-85 knots on final, and 79 knots crossing the threshold.

## How fast does a Cessna 172 need to go to take off?

60 knots is considered to be the optimum takeoff speed. This speed will allow enough lift under the wings to give a smooth, stall-free takeoff. What is the landing speed of a Cessna 172?

## What is VX and VY in physics?

Vx and Vy are the X and Y components of our velocity. At the top where it reaches its maximum height vertical component of our velocity becomes zero as in the case of free fall examples. After Vy becomes zero our ball changes its direction and make free fall now.

## What’s VY speed?

VX is known as the ‘Best Angle of Climb’. This is the speed that gives you the most altitude in the shortest distance. VY is known as ‘Best Rate of Climb’. Gives you the most altitude in the shortest time.

## What is VR speed in aircraft?

Definition. Vr is defined as the speed at which the rotation of the aircraft should be initiated to takeoff attitude. Rotation speed (V_{r}) cannot be less than V_{1}.