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PostPosted: Tue Feb 07, 2017 6:40 pm 
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Joined: Mon Feb 06, 2017 8:13 am
Posts: 156
Just like the title says, is it possible to estimate your fps at impact based on the damage to a pellet? Say you fire a lead pellet into a frying pan... Is there an average speed that the pellet will flatten? Break apart?

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Stoeger X3 .177, UTG 3-9x40 - 5.5 fpe
Crosman Shockwave NP .22, Hawke Airmax 4-12x40 - 16 fpe
Pumper Project .22, Centrepoint 4-16x40 - 13 fpe


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PostPosted: Tue Feb 07, 2017 6:51 pm 
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Joined: Sat Jun 18, 2016 1:06 pm
Posts: 175
Location: Yukon
There is a pyramyd air blog article on indoor shooting at high speed and requiring a better back stop or ventilation from the lead breaking apart. I believe it was saying over 600 or 700 fps, the pellet will start coming apart on impact.

Sorry, don't have a better answer, the article is a good read tho


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PostPosted: Tue Feb 07, 2017 6:59 pm 
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Location: Yukon
or buy a chrony, its worth it.
lots of fun to measure velocity on different pellet weights, variable power (if an option) and calculate FPE


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PostPosted: Tue Feb 07, 2017 7:06 pm 
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Thanks, I think I've read the same article that mentioned pellets breaking apart around the 600 fps mark.

I may end up grabbing a chrony.

Any guesses?
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_________________
Stoeger X3 .177, UTG 3-9x40 - 5.5 fpe
Crosman Shockwave NP .22, Hawke Airmax 4-12x40 - 16 fpe
Pumper Project .22, Centrepoint 4-16x40 - 13 fpe


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PostPosted: Tue Feb 07, 2017 7:18 pm 
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Joined: Sat Jun 18, 2016 1:06 pm
Posts: 175
Location: Yukon
wow, they are coming apart.
what caliber and brand?

if I had to guess, over 700 maybe 800ish? :|


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PostPosted: Tue Feb 07, 2017 8:15 pm 
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Joined: Sat Nov 03, 2007 4:19 pm
Posts: 8997
Location: Coalmont BC
Image

Any guesses?

Bob

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Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


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PostPosted: Tue Feb 07, 2017 8:23 pm 
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Location: Canada
Fast enough to lay a spanking on something. :lol:

A chrony is the best way. In the mean time, there are apps like Chrono connect that you can use with your phone to get a reasonable ballpark idea of velocity. Very much a "garbage in, garbage out" sort of thing...do your best to feed it accurate information and it will be more accurate.

https://play.google.com/store/apps/deta ... lite&hl=en

Al


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PostPosted: Tue Feb 07, 2017 8:26 pm 
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Joined: Fri Jul 08, 2016 8:52 pm
Posts: 39
Location: Chilliwack, B.C.
rsterne wrote:
Image

Any guesses?

Bob


I'm guessing close to 950 fps :D


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PostPosted: Tue Feb 07, 2017 8:56 pm 
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Joined: Tue Oct 18, 2011 12:21 pm
Posts: 431
Location: Ontario
Hi RSterne!

I think the deformation would be more around 500 to 600 fps. Pass that point the petals would break off.

R-Gun Pete


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PostPosted: Tue Feb 07, 2017 9:06 pm 
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Location: Coalmont BC
79 gr. BBT at ~930 fps (~150 FPE).... hitting a 3/16" steel plate....

Bob

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Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


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PostPosted: Tue Feb 07, 2017 9:19 pm 
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Joined: Mon Feb 06, 2017 8:13 am
Posts: 156
I used one of the chrono apps and it came back consistently between 502-504 fps. I guess I'll have to pick up a real chrono to get a better answer.

This is with an 8.64 grain domed pellet, putting it JUST over the limit of a non-PAL, I guess I'll take a little bit of the spring tension out. Ideally I'd like friends without PAL's to be able to take it out.

I was surprised that the pellets were coming apart so much; it's a >495fps rifle with a tiny 21 coil spring. I've shimmed the spring about 2cm. Out of the box it was likely less than 400fps. Pointed pellets were embedding flush into the wood; now I get the same penetration with a wadcutter.


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PostPosted: Tue Feb 07, 2017 9:39 pm 
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Joined: Sat Jun 18, 2016 1:06 pm
Posts: 175
Location: Yukon
So 700-800 was a close guess :rolleyes: lol suppose if I knew how to tell, I wouldn't need a chrony

rsterne wrote:
79 gr. BBT at ~930 fps (~150 FPE).... hitting a 3/16" steel plate....

Bob


Bob, that's a nice splat - impressive energy.


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PostPosted: Tue Feb 07, 2017 9:52 pm 
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Joined: Wed Nov 02, 2016 2:27 pm
Posts: 128
Location: Brampton Ontario
I agree with R gun Pete. I have a 700 FPs .177 and all I get out of my pellet trap is bits and peices no complete pellets at all. I have a crony, can't be much more than 500 FPs for sure.


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PostPosted: Wed Feb 08, 2017 7:53 am 
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Location: Dryden,Ontario
i have been playing with an audio program on the computer to measure fps.I tried a couple different apps on my phone with very inconsistent results.The phone app seems to work ok on my grand daughter's pumpmaster 760 but not my springer.https://www.youtube.com/watch?v=Aqu_o0aNbUw hope this helps


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PostPosted: Wed Feb 08, 2017 9:04 am 
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Joined: Mon Feb 06, 2017 8:13 am
Posts: 156
A quick update: I used two different chrono apps on my phone this morning, taking my time to measure distances more accurately. Consistently telling me I'm between 540-560 fps. At impact, closer to 500fps, which apparently is still enough to fragment the pellet. It's no mechanical chronograph, but there's definitely no way my little Stoeger X3 is pushing 600+ fps.

_________________
Stoeger X3 .177, UTG 3-9x40 - 5.5 fpe
Crosman Shockwave NP .22, Hawke Airmax 4-12x40 - 16 fpe
Pumper Project .22, Centrepoint 4-16x40 - 13 fpe


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