Saturday, 1 May 2021

Applying suvat to the Great Mell Fell rifle range

 I finally got to visit the old rifle range behind Great Mell Fell.

The red-roofed building in the foreground is behind a wall and a bank of earth that would have been where the targets were placed.
The map shows that the whole range is 1km long from fence to fence. The actual firing distance would be shorter. I looked up the muzzle velocity of World War 2 rifles and 745m/s seems to be the British choice. So let's say the bullet was fired 745m down the range. It would take 1 second to hit the target. In that time it would be being pulled downwards by gravity. To calculate the fall I use s = ut + 1/2at^2. Acceration a = 9.81m/s^2. Initially it was falling vertically at 0m/s. So if t=1s, then s = 4.9m. That is much, much bigger than I was expecting!