MaxuS the 2nd wrote:How are you going to sight the plate at 400m, Rag?
That's a bloody long way to be looking for a (I'm guessing relatively small) steel plate.
Not that small a plate, but not vast, so I considered the problem.
The scope I have is the popular 3-9x40 - not really ideal for long range shooting, but usable.
Of course, this adjustable magnification means I can either see a fairly wide angle, or at full magnification, see the target large enough I can take aim properly.
I'll look into it. Worst comes to worst, I could paint the plate bright red, or tape a piece of paper over the front to make it more distinct.
@Jared: That idea isn't that great if I'm honest. The sabot, although it's going to be as light as possible, at the speeds of around 900 fps is still going to carry enough energy that a "retaining lip" isn't really an option.
Usually if any design requires a part with more than a few joules of energy to be stopped quickly, then it's going to damage itself, and it's not the right design.
Also, as it's going to have full calibre fins, the dart itself would get caught or damaged by the lip.
My plan for slowing the sabot is much more tricksy than that. I know I wasn't going to explain how I was going to do it yet, but... I'm going to fit a new attachment to the twist lock system on HEAL's muzzle, that uses the launcher's own power to form a vacuum behind the sabot. But this is only part of my plan.
But what I'm really pleased about is that when an dart & sabot are fired through the attachment, the speed of sound around the sabot is physically changed. A sonic shockwave forms ahead of the sabot, and that's used to generates transonic drag forces, which combined with the vacuum behind the sabot, slows it sufficently that it's separated quite significantly from the dart.
The dart itself is only minimally affected by this, because it's design is built to cope with subsonic, transonic and supersonic drag as best as possible.
And because the attachment uses some of the energy from the muzzle blast to generate this vacuum and transonic drag, then bleeds off the rest it's two birds killed with one stone.