What is the setting? Shooting from indoors or out in the open?
Bout 750fps with 26gr Hades. Shooting through lower walkout into the open. Muzzle outside/meter outside
Upvote 0
What is the setting? Shooting from indoors or out in the open?
So, if you have particular tubing in mind with a known ID (measured is best), then I can modify any of my designs to fit into that.
Please take a look at the shorty Huben pistol muffler shapes below.
The question is, which shape looks the best, and which the worst? Left to right; 1, 2, 3, 4 (don't count the bare muzzle).
Aestheticly speaking, I prefer 3 and 4.Please take a look at the shorty Huben pistol muffler shapes below. The basic shapes were suggested and negotiated by the three individuals that are driving this muffler project: The customer; the printer, and the designer (me). Matthias' quest for a muffler with looks may or may not be addressed by these, but the general size and shape was proposed by the customer.
The request was for a muffler that would be short enough to fit into a holster. It would still make the Huben pistol hearing safe, for hunting at full power. 2.75 to 3" long was suggested. All of my related models shown blow are 3" long. Other length would be possible, but I wanted to start with what was requested first.
A short muffler has the laws of physics against it, so it will need all the help it can get. To that end, expansion volume is added ahead of the pistol's air reservoir. The rebated shape below the pistol muzzle is echoed to facilitate insertion into a holster. And as a nod to styling.
Rather than a single oval shape, there are two conjoined ovals. Both for styling, and because the outer wall will have greater stiffness against internal air pressure.
So, the question is, which shape looks the best, and which the worst? Left to right; 1, 2, 3, 4 (don't count the bare muzzle).
The last two images are captured from behind, so the numbering is reversed (or refer the image number). On the rear images, note how closely the muffler profile matches the pistol. Also use that to form an opinion about which looks best.
The last three mufflers (based on the frontal image) have the same basic design, except that the fillet radius in the middle differs: The radii are 10; 7.5 and 5 mm, respectively. The larger fillet radius contains more space inside the muffler. The smaller fillet radius creates a stiffer structure.
The first muffler next to the bare muzzle model has a larger upper radius than the other three. I am keeping my opinions to myself, until I hear yours
View attachment 388497
View attachment 388498
View attachment 388499
View attachment 388500
View attachment 388501
View attachment 388502
View attachment 388503
View attachment 388504
View attachment 388505
Please take a look at the shorty Huben pistol muffler shapes below.
The question is, which shape looks the best, and which the worst? Left to right; 1, 2, 3, 4 (don't count the bare muzzle).
87.8-88.1 un-modded, very not neighborhood friendlyMay I ask what decibel reading without the mod? I appreciate you taking the time to testing!
I prefer 2,3&4 over 1. #2 seems to conform most closely to the shape of the muzzle. It is unfortunate that the gap between the expansion chamber and tube cannot be covered by a flange due to the method of attachment. In the absence of that, I would suggest looking at a design that has a recessed expansion chamber with the size of the recess matching that of the differential between muzzle attachment point and tube. Forgive the crude schematic!:Please take a look at the shorty Huben pistol muffler shapes below. The basic shapes were suggested and negotiated by the three individuals that are driving this muffler project: The customer; the printer, and the designer (me). Matthias' quest for a muffler with looks may or may not be addressed by these, but the general size and shape was proposed by the customer.
The request was for a muffler that would be short enough to fit into a holster. It would still make the Huben pistol hearing safe, for hunting at full power. 2.75 to 3" long was suggested. All of my related models shown blow are 3" long. Other length would be possible, but I wanted to start with what was requested first.
A short muffler has the laws of physics against it, so it will need all the help it can get. To that end, expansion volume is added ahead of the pistol's air reservoir. The rebated shape below the pistol muzzle is echoed to facilitate insertion into a holster. And as a nod to styling.
Rather than a single oval shape, there are two conjoined ovals. Both for styling, and because the outer wall will have greater stiffness against internal air pressure.
So, the question is, which shape looks the best, and which the worst? Left to right; 1, 2, 3, 4 (don't count the bare muzzle).
The last two images are captured from behind, so the numbering is reversed (or refer the image number). On the rear images, note how closely the muffler profile matches the pistol. Also use that to form an opinion about which looks best.
The last three mufflers (based on the frontal image) have the same basic design, except that the fillet radius in the middle differs: The radii are 10; 7.5 and 5 mm, respectively. The larger fillet radius contains more space inside the muffler. The smaller fillet radius creates a stiffer structure.
The first muffler next to the bare muzzle model has a larger upper radius than the other three. I am keeping my opinions to myself, until I hear yours
View attachment 388497
View attachment 388498
View attachment 388499
View attachment 388500
View attachment 388501
View attachment 388502
View attachment 388503
View attachment 388504
View attachment 388505
The 4 section Impulse air is plenty backyard friendly. It’s a mystery why it works so well on the GK1 and it has been languishing in my drawer for a year because I found it to be much less effective than the DonnyFLs on my FX rifles. As to the broader question of why to choose to use a pistol in the backyard, there are many rationales. First and foremost, one might choose to get this as their only PCP and want it to have as much versatility as possible. I could in theory screw on your louder, holster-compatible mod for hunting in the woods and then attach a more effective mod and reduce power for backyard plinking. Second, pistols have great applicability for pesting in enclosed environs like my chicken coop. Third (and no doubt there are more), a pistol is a more discreet and transportable device for me to be in possession of in my yard. As my (cool) neighbor pointed out, when they first saw my M3, they thought it was an assault rifle! Again, the contents of this thread speak to the desire to have a backyard friendly option. My rifles also all need mods, so the notion that the pistol becomes a rifle is moot, given that my rifles are all plus-sized in comparison. What we have here is a airgun that is more powerful and way shorter than the highly prized small bullpups, such as the Leyla and Veteran shorty. That makes it very special.Weevil,
To address your more technical question, if folks want backyard friendly, my advice would be to use an air rifle. They are more efficient at a given power level and therefore quieter, "out of the box". Especially if they are shrouded. Therefore, making rifles even quieter with add-on mufflers is a much easier task.
The Huben pistol is very powerful, considering its 8" barrel. If you want it backyard friendly at full power, it may take a foot long muffler. That begs the question; why not just start with a short rifle? Or, as some people are doing, dial back the power.
Now, I am not going to tell anyone that what they want is impossible or silly. I simply set expectations to "hearing safe", rather than backyard friendly for mufflers either side of 5" long. I am willing to try something, provided no one is disappointed because they are expecting magic.
I usually do not start with styling, because that is moot, if function is inadequate. The fact is that whipping up a design in the space of a few hours is more fun to me than watching TV. I do have a different baffle technology that I am keen to try in the "shorty" conjoined tube design above. I actually have two, but the second one is going to be developed in private, rather than given away prematurely. If I did not have that spark of a possible solution, I would be less motivated. I think that conventional baffles would not be very effective at a 3" length.
The desire for a quick release mechanism keeps coming up. That would make a long muffler less of a pain to use on a pistol. However, I am of the opinion that to achieve and maintain proper alignment would take machined metal mating parts. I think that printed parts on both sides of the "joint" would lack the precision and durability required and expected. If I did a quick release design, I would want to have it tested privately before risking my non-existing reputation by posting the design on AGN. If reputation matters, browse my 6000+ posts on GTA.
Thanks again for the brief test. Just wondering with all the mods you tested are there poi changes using the iron sights?87.8-88.1 un-modded, very not neighborhood friendly