Tier One Spartan 3 Quick Look

[TattooedGun]

I haven't had chance to get to the range with my .223 since I got it back from Norman Clarks for being threaded and other work. But I did have a bunch of blanks lying around and an empty range down the road where I could get away with firing off a few blanks without raising eyebrows unlike if I were to do it in the back garden....!

Anyway, here's the results from the nights testing the Spartan 3 with blanks inc. video and Decibel Meter Readings:

http://blog.stegough.com/tier-one-spart ... 23-blanks/

I tried to make it as consistent as possible and therefore as scientific.

I may ramble, and I may re-write it at a later date after some sleep, but here's my review.

I will make some other videos of stripping and reconfiguring the mod sometime soon :)

[TattooedGun]

Any mathematicians in here care to help out by going over my calculations for me...

Since Sound Level is a logarithmic scale I believe it to be true when I say:

*There is roughly 23.2 db(A) difference between unmoderated and moderated. Since volume is a logarithmic scale for every 3db(a) increase the volume doubles. If we start at 99.8db and double the energy (twice as much), we will have 102.8db. If we then double the energy again (+3db) we will have 105.8db which is twice as much again from the initial figure, which means 4x as much energy in 6db. Another 3db sees us at 108.8db which is 8x as much energy. If we do this until we reach 123db (unmoderated) :

111.8db = 16x
114.8db = 32×
117.8db = 64x
120.8db = 128x
123db = 247.bowl (rounded)

Please note that I am by no means a mathematician and I my grasp of logarithmic scales is limited, but I believe this calculation to be true. I welcome anyone to correct me if I am wrong.

[WelshShooter]

Any mathematicians in here care to help out by going over my calculations for me...

Since Sound Level is a logarithmic scale I believe it to be true when I say:

*There is roughly 23.2 db(A) difference between unmoderated and moderated. Since volume is a logarithmic scale for every 3db(a) increase the volume doubles. If we start at 99.8db and double the energy (twice as much), we will have 102.8db. If we then double the energy again (+3db) we will have 105.8db which is twice as much again from the initial figure, which means 4x as much energy in 6db. Another 3db sees us at 108.8db which is 8x as much energy. If we do this until we reach 123db (unmoderated) :

111.8db = 16x
114.8db = 32×
117.8db = 64x
120.8db = 128x
123db = 247.bowl (rounded)

Please note that I am by no means a mathematician and I my grasp of logarithmic scales is limited, but I believe this calculation to be true. I welcome anyone to correct me if I am wrong.

Be careful not to mix up acoustic decibels with electronic/noise decibels. As a rule of thumb, a 20dB increase in acoustic sound pressure level (SPL) equations to roughly 4 times the perceived volume.

http://trace.wisc.edu/docs/2004-About-dB/

[TattooedGun]

Any mathematicians in here care to help out by going over my calculations for me...

Since Sound Level is a logarithmic scale I believe it to be true when I say:

*There is roughly 23.2 db(A) difference between unmoderated and moderated. Since volume is a logarithmic scale for every 3db(a) increase the volume doubles. If we start at 99.8db and double the energy (twice as much), we will have 102.8db. If we then double the energy again (+3db) we will have 105.8db which is twice as much again from the initial figure, which means 4x as much energy in 6db. Another 3db sees us at 108.8db which is 8x as much energy. If we do this until we reach 123db (unmoderated) :

111.8db = 16x
114.8db = 32×
117.8db = 64x
120.8db = 128x
123db = 247.bowl (rounded)

Please note that I am by no means a mathematician and I my grasp of logarithmic scales is limited, but I believe this calculation to be true. I welcome anyone to correct me if I am wrong.

Be careful not to mix up acoustic decibels with electronic/noise decibels. As a rule of thumb, a 20dB increase in acoustic sound pressure level (SPL) equations to roughly 4 times the perceived volume.

http://trace.wisc.edu/docs/2004-About-dB/

Yeah, I read that 10db is double the perceived volume :) so 20db would be 4 times because its doubled and doubled again...

[DL.]

Be aware that blanks are pretty dirty, they leave crud and unburned power all over the place after firing. If you do this sort of test often, the moderator might have a bit of a fireworks show on shooting live rounds, when the unburned powder 'cooks off'.

I'm not trying to be alarmist, you will want the mod 'coked up' with burned powder residue to add to the moderated effect, just not the wrong sort of lively residue that could cause you problems over time.

[TattooedGun]

Be aware that blanks are pretty dirty, they leave crud and unburned power all over the place after firing. If you do this sort of test often, the moderator might have a bit of a fireworks show on shooting live rounds, when the unburned powder 'cooks off'.

I'm not trying to be alarmist, you will want the mod 'coked up' with burned powder residue to add to the moderated effect, just not the wrong sort of lively residue that could cause you problems over time.

Thanks for the heads up.

This was a one time deal.

Itchy trigger finger, bunch of blanks that I was never going to use...

The mod is going to be cleaned before live rounds, so not too worried anyhow.

[ovenpaa]

Have you looked at wet versus dry suppressors and the use of liquids for attenuation?

[TattooedGun]

Have you looked at wet versus dry suppressors and the use of liquids for attenuation?

No, but since I learned about "First round Pop" I have learned about countering it using water in the suppressor (a few drops apparently vaporises and cools the gasses quickly enough to counter the effect.

I looked a little into Lithium grease in the suppressor to cool the gasses quicker.

I haven't played with any of it though, it's all theoretic but I have learned a bit in the past week since the blanks :)