Request for V50 calculator

[Shivanthi Rajapakshe]

Request for the V50 calculator or formula

 

[johnleo]

The V50 formula is used to estimate a bullet's velocity at a specific range, often used in ballistics calculations. It's a way to calculate the velocity of a projectile at a distance where the expected velocity is known at a different distance. The formula is based on experimental data and can be found in various ballistic resources. Here's a breakdown of the concept and how it might be used with a calculator: What is the V50 Formula? The V50 formula is used to determine a projectile's velocity (V) at a specific distance (D) based on its velocity (V1) at a known distance (D1) and a known ballistic coefficient (BC). It helps estimate the velocity at a different point in the projectile's trajectory.

Formula:

The general form of the V50 formula is:

V = V1 * (D1/D)^n

Where:

• V is the velocity at the target distance.
• V1 is the initial velocity at a known distance.
• D1 is the known distance from the muzzle.
• D is the target distance.
• n is a factor that varies based on the projectile and its ballistic coefficient.

Using a Calculator:

1. 1. Identify Knowns:
   Determine the initial velocity (V1), the initial distance (D1), and the target distance (D).
2. 2. Determine "n":
   The exponent "n" is usually provided in ballistics tables or calculated based on the projectile's ballistic coefficient and other factors.
3. 3. Input into Calculator:
   Enter the values into the formula on your calculator, following the order of operations.
4. 4. Calculate:
   Perform the calculations, paying attention to order of operations (parentheses, exponents, multiplication/division, addition/subtraction).
   

Example:

Let's say you know: V1 = 2700 ft/s (at D1 = 100 yards), D = 300 yards, and n = 0.5.

Then, the calculation would be:

V = 2700 * (100/300)^0.5

V ≈ 1558.85 ft/s

Important Considerations:

• The V50 formula is an approximation. Real-world ballistics can be affected by various factors like wind, temperature, and air density.
• Different sources may provide slightly different formulas or values for "n" based on their specific models and data. Always refer to reliable ballistics resources.
  
  
• Some calculators may have built-in functions for calculating projectile trajectories, making the process easier.
• Graphing calculators can be programmed to perform these calculations.

 

[pierreick]

Hi,
Consider this link:

Thread 'Shell V50 equation'

Feb 26, 2011

I am looking for an equation to calculate HFO viscosity for a measured temperature based on measured viscosity at ONE different temperature. I can live with some inaccuracy.

Something called the "Shell V50 equation" is mentioned around these forums, but I can not find the actual equation anywhere.

Anyone?

• Havre
• Replies: 4
• Forum: Petroleum engineering general discussion

Pierre