I bought the stackable FX LDC for my wildcat 22. Got both ends but only 2 of the center sections. Quieted it right down, at least for me. Trouble I had was that without the center sections my POI changed slightly. As I added one and then the other it would cause different POI changes. When I got to looking real close you could see a faint clipping mark. So I chucked it up in the lathe and turned everything out 20 thousands. Now the POI stays the same if it is on or off. Problem solved. Couldn't tell any difference in sound. I have a Nephew that has a big commercial machine shop and makes thousands of silencers on contract for different companies out of titanium. Cool stuff. So I asked him about it today. Told me they size 18 thousands over the cal. Also said that in some designs if you size two tight it can cause a vacuum behind the projectile causing a POI change. Again interesting stuff. Maybe Neal will chime in here. How tight do they try and hold over the cal on airguns? Seems to me they size to tight, because you hear quite a bit about clipping and spiraling. Seems to me that these things are a lot like airplane props. Lots of black magic involved.
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FX stackable on wildcat
- Thread starter Kitplanenut
- Start date
Some companies do size too tight, there are a lot of things to take into account when you add something to the end of a barrel of a gun, the more attachments and things involved the larger the clearances need to be. Kalibr used very tight tolerances on their Crickets and from the feedback I got from Wild West when Steve owned it was that they had all kinds of problems with clipping on the Crickets. The longer the LDC the larger the tolerances need to be, I tend to leave larger tolerances on guns that have shrouds that are not solidly mounted, I tried the small tolerances and found that there were a lot of issues with clipping and most of them on guns with shrouds and the Korean guns. I also noticed that opening up the holes and leaving larger tolerances made such a small difference to the report that it would not even register the difference on my DB meter, at some point I am sure it will become noticeable but I do not have the time to test to see where that is. I think 18 thou is way too tight for an air gun, I tend to leave about 60, all depending on the length of the LDC and what it is being attached to, if it is being attached to an adapter I will increase it slightly, if it goes on a rubber mounted shroud I will increase it, since I have made these changes I have had a huge reduction in clipping problems. I have also found that a few air guns are quieter using an LDC with an even larger bore, I am experimenting with this, time permitting to try and find out why? Some air guns using small bores and tight tolerances have a high pitched report that irritates me whereas the larger bore gave more of a dull thud, something much more pleasing to the ear.
The main problem is accuracy and tolerances allowed at the factories, I have had LDC's made that appear perfect on the lathe and have worked perfectly on 2 of my guns and clipped on the third one, so is it the LDC or the gun? My money is that the gun has loose tolerances otherwise the LDC would clip on all 3 of them, not just the one. So once in a while I still have to walk a customer through how to fix a clipping issue and explain to them, sending the LDC back to me does not help, I can only check it and make sure it is made accurately, clipping has to be addressed on the gun it is going to be used on. As for the change in POI, that can happen to any gun with an LDC attached to it, my internals tend to make very little difference to the POI and I believe a lot of that is their design and also the larger bore holes, different pellets can also change the POI when you use an LDC on an air gun as their shape and design can be effected differently by the turbulence inside the LDC. So if you have an LDC added to your gun and the POI changes you might try different pellets and see how the POI alters. Again I can only speak for my own designs and not those used in other LDC's. I hope at least some of this information might be of help to those who use LDC's on their gun, or want to try making their own, all the best, Neil.
The main problem is accuracy and tolerances allowed at the factories, I have had LDC's made that appear perfect on the lathe and have worked perfectly on 2 of my guns and clipped on the third one, so is it the LDC or the gun? My money is that the gun has loose tolerances otherwise the LDC would clip on all 3 of them, not just the one. So once in a while I still have to walk a customer through how to fix a clipping issue and explain to them, sending the LDC back to me does not help, I can only check it and make sure it is made accurately, clipping has to be addressed on the gun it is going to be used on. As for the change in POI, that can happen to any gun with an LDC attached to it, my internals tend to make very little difference to the POI and I believe a lot of that is their design and also the larger bore holes, different pellets can also change the POI when you use an LDC on an air gun as their shape and design can be effected differently by the turbulence inside the LDC. So if you have an LDC added to your gun and the POI changes you might try different pellets and see how the POI alters. Again I can only speak for my own designs and not those used in other LDC's. I hope at least some of this information might be of help to those who use LDC's on their gun, or want to try making their own, all the best, Neil.
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