Airgun silencer part 6

continues from part 5

here we go:

20170205_194239

So today I got to test the assembly… I tested on my Air Arms S410 TDR .177, using the JSB Match Diabolo Exact 4.52 mm / 0.547g / 8,44gr. From the previous sections you will recall that the sensors are spaced 17 notches (of 7mm each) apart => thus 119mm

pulses_20170205_185417

We see the time between the pules is measured at 516us – remember that the scope has a finite resolution (around 4us at this time base). But ignoring that, we can calculate the speed as 119mm/516us or more readable as 230.6 m/s or 756.6 fps. I repeated this with 3 shots, each measuring 516us between the pulses.

In terms of energy, that works out to 11.4 ft.lbf or 15.4 Joules.

Just for interest sake I took snapshots of the 1st and 2nd pulses too… both measuring 22.40 us

sensor1_20170205_185613

sensor2_20170205_191441

Ultimately this is what I’m aiming it to be…

Swiping the screen will show the complete string for :

pellet description
Shot#     FPS       Spread         FT.LBF
1             756           0.0               11.3
2             755          -1.0               11.3
3             758         +2.0               11.3
4             756           0.0               11.3

Additionally under the App name the pellet information is shown – if no pellet is selected it will state “No pellet selected – click here”

The menu will be able to:
– edit the pellet database (caliber (.177 / .20 / .22), description, weight (gr)
– delete current string (are you sure?)
– share current string (email ?)
– edit sensor distance (in X.XX mm) – this edits the sensor distance for the specific silencer and saves it on the specific micro

Here is a screenshot from my Android phone done on a FX Streamline 5.5mm using JSB Exact Jumbo Diabolo 15.89gr pellets – 3 shots on high power, 3 shots on medium power and 3 shots on low power (velocity is in fps).