# Is VX and VY constant?

## Is VX and VY constant?

Here are some formulas that describe projectile motion: Thus the vertical velocity (Vy) is continually increasing. The horizontal velocity (Vx) remains constant and is equal to Vxo. If an object is pointed at an angle, the motion is essentially the same except that there is now an initial vertical velocity (Vyo).

## What is VX and VY?

Review of the Basics. Vx is the slowest (IAS), and is the Maximum ANGLE of climb. It allows one to climb to altitude within the shortest horizontal distance. Vy is slightly faster, and is the Maximum RATE of climb. It allows one to climb to altitude in the shortest time.

## How do I find VX?

Projectile motion equations

1. Horizontal velocity component: Vx = V * cos(α)
2. Vertical velocity component: Vy = V * sin(α)
3. Time of flight: t = 2 * Vy / g.
4. Range of the projectile: R = 2 * Vx * Vy / g.
5. Maximum height: hmax = Vy² / (2 * g)

## How do you get V with VX and VY?

1. To get vx,y you can just take the time derivative of x(t) and y(t).
2. The idea is that v0 will not change through the whole motion, what will change is the ratio between vx and vy but it should always be equal to the desired speed v = sqrt(vx^2 + vy^2) should always be equal to the set velocity.

## What happens when VX and VY meet?

The Absolute Ceiling: Where Vx and Vy Meet Your “absolute ceiling” is the highest altitude you could possibly fly. At this altitude, the power available curve crosses through the lowest point of the power required curve. Now you can’t climb anymore because you’re out of excess power.

## Does VX and VY 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.

## Why does VY increase with altitude?

The power required (PR) curve moves up and shifts to the right slightly. Find the point of maximum separation between the two newly shifted curves (the vertical red line). Move straight down to the airspeed line and you’ll see that Vy has actually increased with an increases in altitude (it’s now 90 knots, TAS).

## What is best angle of climb?

Best Angle of Climb speed (Vx) 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.

## How do you determine the best climb angle?

You can determine the speed for best angle of climb (VX) by drawing a tangent on the “Climb Rate v Airspeed” graph from the origin of the climb rate to the climb rate curve. Climbing at this speed will yield the greatest height gain per distance traveled.

## Does parasite drag increase with speed?

Drag and Airspeed Parasitic drag increases with the square of the airspeed, while induced drag, being a function of lift, is greatest when maximum lift is being developed, usually at low speeds. The diagram below shows the relationship of parasitic drag and induced drag to each other and to total drag.

## Why does parasite drag increase with speed?

Induced drag is greater at lower speeds where a high angle of attack is required. As speed increases, the induced drag decreases, but parasitic drag increases because the fluid is striking the object with greater force, and is moving across the object’s surfaces at higher speed.

## Why does parasite drag increase as airspeed increases?

Conversely, parasite drag increases as the square of the airspeed. Thus, in steady state, as airspeed decreases to near the stalling speed, the total drag becomes greater, due mainly to the sharp rise in induced drag.

## How do you reduce induced drag?

Considering the induced drag equation, there are several ways to reduce the induced drag. Wings with high aspect ratio have lower induced drag than wings with low aspect ratio for the same wing area. So wings with a long span and a short chord have lower induced drag than wings with a short span and a long chord.

## Why do vortices cause drag?

Vortices reduce the air pressure along the entire rear edge of the wing, which increases the pressure drag on the airplane. The energy required to produce a vortex comes at the expense of the forward motion of the airplane. Tilting the airplane’s wings upward makes the vortices stronger and increases vortex drag.

## What is an example of form drag?

Form drag is caused by the resistance of fluids (liquids or gases) to being pushed out of the way by an object in motion through the fluid….Drag.

Object Drag Coefficient (C)
Bicycle 0.90
Skydiver (horizontal) 1.0
Circular flat plate 1.12

## What is the difference between skin drag and form drag?

Drag due to skin friction consists of that part of the drag that pulls the surface of the body tangentially. Form drag consists of that part of the drag that pushes the body in normally.

## What is skin friction and form drag?

Friction Drag, also known as Skin Friction Drag, is drag caused by the friction of a fluid against the surface of an object that is moving through it. It is directly proportional to the area of the surface in contact with the fluid and increases with the square of the velocity.

## Why does delayed separation cause lower form drag?

pressure drag is reduced by turbulent flow by delaying boundary layer separation, but this increases the skin-friction drag due to higher shear stresses at the wall.

## What is profile drag?

Profile drag is composed of form drag and skin friction. Form drag results from the turbulent wake caused by the separation of airflow from the surface of a structure. The amount of drag is related to both the size and shape of the structure that protrudes into the relative wind.

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