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How does the disk help block the sound off of the shooter?
In many ways sound waves and light waves react in a similar manner. Both can be absorbed, or reflected.
Imagine a brake with LEDs (Light Emitting Diodes) placed in the holes of the brake, near the outer surface of the brake.
Imagine that these LEDs emit light equally in all directions.
If you turned out the lights in a room and turned on the LEDs in the brake, someone holding the rifle in a normal shooting position would be illuminated by the light energy coming out of the brake. Why? Because there is nothing between the source of light energy and the shooter.
We cannot see the energy of sound waves. However, they travel in a similar manner from the holes in a brake.
Now we will do the same thought experiment with the brake containing the LEDs, but this time we will put the disk on the back of the brake.
We can cut out the lights in the room, and cut on the LEDs in the brake. Now most of the light coming from the brake does not hit a person in the shooters position, because they are in the shadow produced by the disk. Anyone standing to the side of the shooter would be illuminated.
This is the basic Physics behind the device.
If anyone here thinks the disk is ugly, that is OK with me.
I promise not to build one for your rifle.
I thought we might be through with the disk but its still going well.
ALL BRAKES.......... yours, mine and the next guy that posts ARE LOUD. Even the guy you had shooting your rifle was wearing good hearing protection. Get yourself an actual firearm sound meter and record the blast with ALL things being equal. Place the meter beside the rifle's recoil lug, that way it would be in the same location with and without the disk.
This model should work ........ LD_LxTQPR_Firearm_Test_lowres.pdf (larsondavis.com)
If a person holding their rifle in a normal bench shooting position was illuminated by LED lights in his/her brake, the brake is of PP design.
You can install the LED lights but its an assumption, not a validated test.
When you spend hours upon hours of design, engineering and testing, not with LED lights but with actual shooting and controlled photography of the brakes function, one does not need a disk, ring or other contraption for the brake to function perfectly.
I'm sorry, again, but the LED assumption doesn't even hold a candle to this actual photo. There's no disk or contraption on this brake and notice were the light (flame) directs to, along with the concussion.
Again, I'm not saying your brake doesn't function, nor am I saying the contraption has zero value.
BUT............The best muzzleloader shooters, both SML and smokers are not using disks, rings, or contraptions with their brakes.