16 - How to find the 'Sweet Spot' on your PCP air rifle
Vložit
- čas přidán 5. 07. 2024
- How to find the 'sweet spot' for your unregulated PCP air rifle and a performance comparison of a mid-priced unregulated airgun to a high-end regulated air rifle.
--- video contents ---
0:00 - Intro
0:35 - What's a sweet spot?
1:34 - Test setup
2:49 - Cylinder pressurising
4:26 - Pellet selection & chronograph
6:12 - Recording results
9:29 - Creating the results graph
16:23 - Finding the sweet spot
20:19 - Testing a regulated air rifle
21:41 - Comparing unregulated with regulated performance
Please support the channel by buying me a coffee:
www.buymeacoffee.com/hftshooterC
#airgun #airguns #airgunshooting #airrifles #airrifleshooting - Sport
Nice, well explained, thank you 👍
Glad it was helpful! 🙂👍
Im not into hft anymore but do use a s400 classic for paper punching , Your findings are almost identical as my own , I fill to 170 bar and shoot it down to 110 bar , This gives me exactly 60 shots with no change of impact point vertically/horizontally. Cracking guns the s400
They certainly are. Thanks for sharing. 🙂👍
Cracking video
Thanks! 🙂
Very good informative video once again. I do look forward to your uploads….
I appreciate that! 🙂👍
Great video, really interesting and the first I've seen covering the subject! A very un-patronising well done from me! When I have my next day up at Pete's Farm, I'm going to try out my Revere from full charge to power-drop and see what the results are. As standard, the Revere has a regulator and I wonder if its main contribution is to the consistency of fps over the claimed shot count. One thing I absolutely love about the FX radar chrono is the ability to email the whole shot string data; a quick import to google sheets and I'll have the whole dataset without the grief (for a non-typist) of entering it all manually. Once again, your vid has set the thought wheels in motion. Big ol' cheers and keep up the good work!
Hi Martin, many thanks. As your Revere has a regulator it won't have a sweet spot. The whole point of the regulator is to keep the muzzle velocity as constant as possible. The FPS shouldn't drop off until your cylinder pressure falls below the reg pressure. Hope that helps.
That is very interesting. It makes you wonder if the cost of a regulator is worth it, if you already have a quality rifle. Perhaps it just helps with the shot count. Personally, I just want my rifle to be as accurate as possible. 😊
Good points Steve. If a rifle has a consistent muzzle velocity then a regulator isn't going to improve shot count, the two go hand in hand. For the most part shooters don't need as many shots as they think. Thanks for your comment. 😀👍
Good video. I've found on my HW100 although regulated that its sweet spot is from around 180 bar to 120 which is a wide range.
Good stuff. 🙂👍
You need a FX Chrono, you can record all the shots ftp on your phone every time,
Thanks for the advice. I'm quite happy with my chronograph thanks. It's not overpriced and I never have any shot errors! 😉
Very good video. In your rifle, does the velocity change if the temperature changes? thanks greetings
I intend to test that, but I think it must do due to changing air density.
Great video .am i right in thinking it was the first 15 shots on the s400 that you used as your example of the total spread and deviation. Would you not get an even better result further up the shot count in say the middle of the sweet spot or am i missing sumething excellent video veary informative and a surpriseing result 👍
Hi Edward, the 10 shots I used for the spread and deviation were from shot 28 of the shot string. This is from where the pressure had dropped to 170 bars which is the normal fill pressure I use for the rifle.
Excellent content as usual but how do you get the pressure off the gauge on the bottle with out purging and opening the fill valve
Good question Michael. Once you've charged the rifle you close the cylinder valve and leave the pressure relief valve closed. The gauge and whip remain pressurised and in effect become part of the rifle cylinder, so as the rifle uses air the gauge shows that drop in pressure. Hope that helps.
@@hftshooter perfect, thank you. Going to do the same in the week and see what my results are.
🙂👍
Well explained! Me and technology are a bad mixture(old school graph paper and a few hours concentration 😡)😁👍👍👍👍👍👍👍👍👍👍👍👍👍
Thanks Alan. You can do it!
Just a comment on methodology. Often the most extreme of the data points at high and/or low ends get tossed out as outliers before the average/spread/standard deviation are calculated. The unregulated numbers has a low outlier in the #1 spot, and the regulated numbers have an outlier at the #5 spot. Those should be tossed out and then calculated. If you do that, the chart for the regulated is flatter than the unregulated. I didn't run spread and standard dev, but from a flatter chart those numbers would also be better.
You can't remove data points because they interfere with the results you wish to achieve. If your rifle produces high and low spikes during testing it's likely to continue to do so when you're shooting. I'm sorry, but the idea of removing extreme data points to provide more constant results is totally unscientific and ridiculous. If you remove any data points you don't like then your results are simply invalid.
It's not about removing data points you don't like. It's removing extreme outliers that throw off the analysis. The outlier can be caused by any number of factors that aren't related to the product you're testing. In the case of shooting, it could be a slight wind, a bad pellet that just happens to be in the group you pulled out, or the shooter. Contrary to being unscientific as you think, it is the more scientific method, especially when you're doing just one test and using just one user. If you repeated your test 10-20 times then including all data points make more sense. Even more sense is having multiple people doing the test that you set up. By the way, I think you mistake that data points that don't agree with a preconception are what I said should be tossed out. It's not multiple data points being tossed out. It's looking at the single lowest point and the single highest point, and how far they are from the rest of the combined group. If they're much further apart from the group than the other shots in the group is from each other, then they're outliers that should be considered to be tossed out. From a shot group of ten, keeping in an outlier can throw off the analysis much more than keeping in one out of 100 shots.
Chemists and physicists employ the method of tossing out the extreme outlier at either end as well. There are many tutorials on statistical analysis that you can watch if you want to learn more. Not trying to criticize you. You're trying to help other shooters, especially beginning shooters (like myself), so I'm grateful for your channel. But if you want to help them with good info, you should have an open mind that you too can improve how you're doing your testing which results in better info.
@@hftshooter
Very interesting. How is the standard deviation figure created? Is it the percentage of the total results? ie 2.7%
There is a formula, but it's quite complicated and difficult to reproduce in a comment. Try googling it and you'll see what I mean. I just used the built in function on my excel spreadsheet to calculate it.
@@hftshooter Many thanks.
Get it regulated on worry's
I'd like to see a regulated S400 that could improve upon 8.6 ft/sec spread and a standard deviation of 2.7!