Measuring the velocity of airgun

[bennedose]

In my experience it is less easy to decide where to start measuring the sound of rifle rather than the target sound. The target produces no sound as long as there is nothing hitting it. The moment the target produces any sound - you can take that point as the pellet hitting the target. The real problem is the rifle sound which is a complex mix of sounds that start before the pellet moves and continue for a long tome after the pellet leaves the barrel.

I have found that the rifle sound starts off at low volume and quickly reaches a peak and aftter the peak there is a slightly slower reduction in sound volume. I start measuring from the end of the peak - just before the volume starts coming down. My justification for this is that there are two peak sounds from the rifle very close together. One is the air explosively escaping the muzle just as the pellet leaves and another sound of the piston hitting the end of the barrel. After these events the sound volume cannot increase at all because all the energy has been expended. So I measure from the point that the energy has been expended and volume starts going down. For both these points you need to expand the sound signature to a considerable degree - so that the start and stop sounds are at least 3-4 cm apart on your screen.

Incidentally the title of your thread is "measuring the velocity of airgun". The velocity of my airgun is normally zero.

[Basu]

Lol........
Benne...pl.put an expanded screenshot with captured moment for better understanding.


Basu

[Suyash]

Need help!! I'm unable to upload the sample of the sound!

[bennedose]

Need help!! I'm unable to upload the sample of the sound!

I will pm you my email id

[Suyash]

Need help!! I'm unable to upload the sample of the sound!

I will pm you my email id

Thanks so much Benne
Did you receive the samples?
Regards!
Suyash

[bennedose]

Got them. Too many echoes. Please see pm

[bennedose]

Lol........
Benne...pl.put an expanded screenshot with captured moment for better understanding.


Basu

Basu I will do that over the next day or two.

[Basu]

Dear benne,
Waiting for you post to know the facts.
I know, so far none of your posts are fictions.
I may or may not like it.

Basu

[sairamrao]

I've got another question. What kind of velocity is given by chrony connect? Is it muzzle velocity or velocity when the pellet hits the target?
Regards
Suyash

chrony connect gives average velocity of the pellet.i.e it calculates the time took by the pellet to travel some fixed distance(like 10yrds) and gives the average speed of the pellet.when gun is fired it generates high sound and when the target is hit,it also generates high sound.so chrony connect analyzes this sound waves.
avg velocity=distance traveled/time.

[New shooter lucifer]

Sai sir can you pls help me out in assembling my air pistol

[New shooter lucifer]

Sir i am having problem in posting pics of my project!!!!pls help me out any1

[Basu]

In Chronoconnect if you feed exact BC , you are likely to get muzzle velocity only.

Basu

[sairamrao]

Sai sir can you pls help me out in assembling my air pistol

I will do my best lucifer .
What model of air pistol is that?
How did you end up with disassembled pistol?
What problem are you facing exactly in attaching the pics?

[New shooter lucifer]

Actually iys an indian ?ade air pistol!!while i was using it ,,while cocking it the barrel of the gun lossed the tension on it ,so i thought that the spring is broken ,also i heard a sound which was similar to that of a breaking a 100 wt bulb!!!

Then i opened it up and found that the spring was all ok!!!!but in this act i lost one of its component similar to a chawanni coin!!? So it can be replaced by a coin!!but again if i assemble it also ..!!i will not be able to make it working!!!can u give me your e mail in pc ..so Thatt i can post ypu the pics of gun!!!also as i was banned in the grup. I am not able to pc you !!!but you can pc me your email!!

[New shooter lucifer]

Actually iys an indian ?ade air pistol!!while i was using it ,,while cocking it the barrel of the gun lossed the tension on it ,so i thought that the spring is broken ,also i heard a sound which was similar to that of a breaking a 100 wt bulb!!!

Then i opened it up and found that the spring was all ok!!!!but in this act i lost one of its component similar to a chawanni coin!!? So it can be replaced by a coin!!but again if i assemble it also ..!!i will not be able to make it working!!!can u give me your e mail in pc ..so Thatt i can post ypu the pics of gun!!!also as i was banned in the grup. I am not able to pc you !!!but you can pc me your email!!