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DryFire Version 4.10 is now available.

How The DryFire Shooting Simulator Works

The Simulator

DryFire is a training aid for shooters who want to improve their skills - and scores! Serious practice require serious concentration - it is hard work - just like the real thing.

DryFire gives you total feedback on where your shot-string goes in relation to the clay - you see it on the PC screen accurate to the nearest centimeter. It lets you practice with your own gun and with your own choice of cartridges and chokes. With it you can practice any clay shooting discipline - in your own home.

The dual-head simulator shows both clays for simultaneous doubles at the same time - exactly like the real thing. This is the ultimate in realism and allows you to track the second clay while shooting at the first.

The Gun Assembly

The DryFire gun assembly is an important piece of the DryFire system and is to be used with your gun. The gun assembly consists of a trigger switch, a trigger box and a muzzle insert. The gun assembly is designed to fit any shotgun from 28 - 12 gauge. It has been designed so that 2 shots can be fired and there is no action on the firing pin of your shotgun.

The trigger switch wraps around the trigger of the gun and the shot is fired by lightly pulling on the micro switch attached to the trigger switch.

The trigger box contacts a small PCB and batteries, the batteries need replacing when the red light fails to comes on when the trigger switch is pulled.

The muzzle insert releases an invisible signal (infra red) when the trigger switch is pulled, this signal is then detected by the camera in the simulator head and this information is then sent to the DryFire software for analysis.

The "Glass Wall"

DryFire treats your wall as if it was transparent and you were looking through it at a real clay layout. The best way to explain this is to show an imaginary shooting stand and an imaginary trap.

The following animation demostrates how DryFire would looks like on the wall (Note: the wall shown is for illustration only - DryFire does not show an image of a wall on the PC screen.):

So, because the wall represents the view of the scene from the point of view of your actual eyes when the you point your gun at the start of the trajectory (the trap) you'll be pointing at exactly the same angle as you would outdoors. By treating your wall as this translucent window into the simulator world, DryFire is able to show you complete trajectories as you would see them in real life while you're swinging through exactly the same angles as you do in real life too.

The Maths

DryFire has been designed to ensure that each clay's flight path is as close to the real thing as possible. To make the clays fly in a realistic manner the following criteria are taken into account by the algorithms that fuel DryFire's hit detection system:

  • Mass
  • Area flat-on
  • Area edge-on
  • Energy required flat-on
  • Energy required edge-on
  • Drag on top surface
  • Drag on bottom surface
  • Minimum drag angle (in degrees)
  • Drag shape on top
  • Drag shape on bottom
  • Positive lift
  • Negative lift
  • Lift angle zero
  • Lift angle negative
  • Friction

The Shot Results

If you have a sharp-eyed instructor, and the sky is right, he can call the position of your shot pattern. DryFire does this for you - on every shot. It shows you the exact shot pattern (choke, cartridge and distance dependent) in relation to the clay.

With DryFire you get detailed feedback every time - hit or miss. It tells you exactly how far you were above, below, ahead, behind the clay - to the nearest centimeter.

Some Examples

This is a trap target rising directly in front of the shooter and going straight away.

The dashed blue line shows the direction the clay is travelling at the point when the shot cloud (the grey blob) is closest to it.

The second distance reported by DryFire is always one perpendicular to the first one - as shown by the magenta line.

DryFire has reported that the centre of the shot pattern is 0.42m head of the clay (since the clay is rising) and 0.83m to the right.

In this case the clay is rising and travelling towards the left. The direction of the clay's travel, at the point when the shot cloud is closest to it, is shown by the dashed blue line.

The magenta line is perpendicular to the direction of travel of the clay.

DryFire has reported that the centre of the shot pattern is 1.74m head of the clay (since the clay is rising) and 0.41m below - i.e. below the direction of travel.