I have searched quite a bit for information pertaining to (AP)FSDS ammunition--pertaining to the projectile design specifics--yet I have had little luck finding much.
For example, the 25x137mm round would be there most desirable round to find data on, as it's the smallest cartridge which appears to have a very effective sabot design. The 25mm has multiple sabot projectiles, but I am speaking to the nature of the fin-stabilized type where the projectile looks like a dart.
I have seen high-speed footage of this similar projectile and the sabot design is interesting because the petals seem to lift away from the projectile before drag is able to get a hold of them.
It appears the rear of the sabot is designed to get a push right as it clears the muzzle from the high-pressure gases exiting, which seems to be how it obtains some of the energy required to split the sabot apart where the driving-band region is.
All I have been able to do is watch videos and sort of imagine the physics going on combined with the shapes of components to guess how they were designed to work, but I haven't been able to find the testing and specification data anywhere to know how the sabot is manufactured to specifically work.
I have wanted to perform some simulations in some of the flow dynamic software I have to try and possibly make my own design that works from a high-pressure 12GA FH. The FH (From Hell) has the powder capacity and muzzle energy capability to potentially mimick a scaled down version of such a sabot, with adequate bore size to have a fighting chance from the start. But to have an idea of what to scale down, it would be a wild guess without the data and specifications from something like the 25mm round.
I also wonder if--because of the aerodynamic stability produced by the fins--the sabot design is meant to impart spin from the rifled 25mm barrel as a form of added stability, or if the design allows slip to occur around the small dart design diameter relative to the bore size.
If anyone knows where to locate such data, it would be greatly appreciated. Thanks
For example, the 25x137mm round would be there most desirable round to find data on, as it's the smallest cartridge which appears to have a very effective sabot design. The 25mm has multiple sabot projectiles, but I am speaking to the nature of the fin-stabilized type where the projectile looks like a dart.
I have seen high-speed footage of this similar projectile and the sabot design is interesting because the petals seem to lift away from the projectile before drag is able to get a hold of them.
It appears the rear of the sabot is designed to get a push right as it clears the muzzle from the high-pressure gases exiting, which seems to be how it obtains some of the energy required to split the sabot apart where the driving-band region is.
All I have been able to do is watch videos and sort of imagine the physics going on combined with the shapes of components to guess how they were designed to work, but I haven't been able to find the testing and specification data anywhere to know how the sabot is manufactured to specifically work.
I have wanted to perform some simulations in some of the flow dynamic software I have to try and possibly make my own design that works from a high-pressure 12GA FH. The FH (From Hell) has the powder capacity and muzzle energy capability to potentially mimick a scaled down version of such a sabot, with adequate bore size to have a fighting chance from the start. But to have an idea of what to scale down, it would be a wild guess without the data and specifications from something like the 25mm round.
I also wonder if--because of the aerodynamic stability produced by the fins--the sabot design is meant to impart spin from the rifled 25mm barrel as a form of added stability, or if the design allows slip to occur around the small dart design diameter relative to the bore size.
If anyone knows where to locate such data, it would be greatly appreciated. Thanks