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I Know What You are Thinking...

What really happens when a Spring-Action Air Rifle is fired!

I hope that this World Famous Suspense Filled Dirt E. Harry Thriller will give you a better understanding of what really happens when you pull the trigger on the spring-action gun. I know what you are thinking... but the bottom line is that the pellet is long gone before any of the recoils and vibrations even begin to think about happening- its simple math. Now then, lets break it down and take a look at what actually happens with the two recoils and the after shock one step at a time.


Dirt E. Harry & Spring-Action Rifle Recoil

The First One-Hundreth of a Second= 9 feet

The Solenoid pulls the trigger and the gun and the sliding vise recoil together straight back caused by the column of air pushing the pellet out of the barrel. This takes place in a 100th of a second. In this example lets say that the pellet is traveling at 900 feet per second- thats the length of 3 foot-ball fields. 1-100th of 900 is 9 so the pellet is on its way 9 feet out of the gun in 1-100th of a second. If  the pellet was traveling 600 feet per second, it would be 6 feet out of the gun, 500 feet- 5 feet and so on.

The Second One-Hundreth of a Second= 18 feet

The spring comes to the end of its travel causing the forward recoil to happen in the 2nd 1-100th of a second. The gun pops forward in a straight line while the gun vise is still moving back. The front recoil begins before the rear recoil is finished. This is simular to the magicians trick of pulling the table cloth out from underneath the dishes. The pellet is now 18 feet from the gun... 2-100ths of 900 equals 18.

The spring hits the end of its travel with such force that the metal support that the gun vise is clamped to begins to vibrate so that the gun vise dips forward and down away from the gun the same way that the nose of a car goes down when slamming on the brakes. Once the car comes to a complete stop, the nose of the car comes up to its level position again and in like manner, the gun vise comes back up to the gun. Note that the barrel has stayed in a straight line so far.

The Next Ten One-Hundreths of a Second= 90 feet

As the pellet continues to speed away from the gun, the after shock vibration begins 36-47 and the gun vise support, gun vise and the gun vibrate up and down as a unit a total of 5 times before coming to a rest. Once the vibration ceases 10-100ths of a second after the trigger is pulled the pellet is now 90 feet from the gun. 10- 100ths of 900 or 1/10th is 90.

The Last 90 One-Hundreths of a Second= 900 feet

And, 90- 100ths  or 9- 10ths of a second later, the pellet is 900 feet from the gun or 900 feet away one second after pulling the trigger.

When does a Pellet exit a Spring-Action Air Gun?


There has been much discussion about "when" a pellet actually exits a spring-action air gun. And, I must admit that in all of the exitment about this subject, i have been wondering myself. So, I obtained a Casio EX-FH25 high speed digital camera and went about setting up this World Famous Suspense Filled Dirt E. Harry Thriller.

As it turns out, it was impossible to actually see the pellet exiting the barrel. Even though the Chronograph said the the slow moving 16 grain EunJin was only traveling 609 feet per second, even at a capture rate of 1,000 frames per second I really thought I could freeze the pellet as it left the barrel. I see now that it would take a much more expensive and sophisicated camera that is capable of somewhere around 10,000 frames per second to stop the pellet.

So then, I reasoned to myself, if I cannot see the pellet then maybe I can capture the result. After think tanking several possibilities, I settled upon a 4" sewer pipe coupler threaded to attach to a lamp stand and plain old copy paper fixed to it with a common rubber band. As a result, when you see the hole in the copy paper (only three inches from the muzzle), that is the instant that the pellet passes that point and thus establishes the precise time when it exits the barrel.

Notice that the barrel moves straight back and then straight forward and then the pellet leaves the barrel just before the spring comes to the end of its travel and starts the horrific vibrations. Therefore, this Thriller supports the theory of and is a fitting sequel to the preceding Thiller (at the top of the page), as it proves that the back recoil, foward recoil and subsequent vibrations have no effect on the trajectory of the pellet what so ever. In short, again, the pellet is long gone!

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