75SD 3/4" hybrid with integral suppressor

[jackssmirkingrevenge]

Aww, you should have went for the head! But impressive nonetheless.

Alreadyperforated

Pic of the new suppressor?

Nothing to see, it's a 50mm diameter tube. Same internal two chamber design as the "drainpipe".

[jackssmirkingrevenge]

After all the sabot/fin work I did for Petitlu here, decided to give it a go myself with this launcher. I used a mild steel shaft from a printer cartridge, not the hardest of metals and definitely not as hard as the 1/4" steel plate I was shooting at.

Shot at 18x, after the smoke cleared I was disappointed to see that not much was done to the plate. When I found the projectile though, I was very impressed - the amount of deformation is remarkable. It's also worth noting the extent to which the previously dead straight plate got bent.

This makes a point about hardness, nature always takes the path of least resistance and in this case it went to the deformation of the projectile as opposed to the penetration of the plate. I trust Petitlu will have better results with his much denser and harder tungsten carbide rod

[POLAND_SPUD]

damn I am sure you forgot to put a piece of paper behind the plate to check if there was any spalling

[MrCrowley]

Did you ever put up a video of the large suppressor in action?

[jackssmirkingrevenge]

Did you ever put up a video of the large suppressor in action?

The videos on the first page of this thread are all with the big suppressor.

POLAND, you can clearly see where the projectile hit on the other side of the plate, but there wasn't really any true spalling.

[Crna Legija]

you should try with a drill bit or tap if you have one.

[jackssmirkingrevenge]

I think I'll leave the hardcore testing to Petitlu, made this shot literally behind a closed door firing the ignitor from another room, this isn't really the sort of stuff that can be done safely indoors.

[DYI]

this isn't really the sort of stuff that can be done safely indoors.

Oh really?

With sufficient containment, anything in the tens of kilojoules range can be done indoors without much trouble.

Also, we've already seen what happens when you use a sharpened tap for this instead of mild steel. Not very interesting, really.

[jackssmirkingrevenge]

With sufficient containment, anything in the tens of kilojoules range can be done indoors without much trouble.

Fair enough, let's therefore rephrase it to say that I didn't want to bother setting up a temporary shielded range in my workshop

Also, we've already seen what happens when you use a sharpened tap for this instead of mild steel. Not very interesting, really.

Where would this forum be if we only did things once? Never said I'm doing something radical here

[DYI]

Fair enough, let's therefore rephrase it to say that I didn't want to bother setting up a temporary shielded range in my workshop

What? You don't have one of those already?

Where would this forum be if we only did things once?

Moving forward


On a more serious note, I'm not, as you might have gathered, a big fan of custom made ammunition, where avoidable. Looking at the great barrels of custom sabots you've made recently, I'm guessing we don't share that sentiment.

[jackssmirkingrevenge]

What? You don't have one of those already?

Nope, hence my liberally ventilated furniture and pock-marked walls. Good thing we don't build houses out of drywall in epoxyland

Moving forward

Touché

On a more serious note, I'm not, as you might have gathered, a big fan of custom made ammunition, where avoidable. Looking at the great barrels of custom sabots you've made recently, I'm guessing we don't share that sentiment.

Oh we do. We've all seen the "miniboy syndrome" at work. On the other hand, machining relatively simple shapes out of acetal isn't that much of a chore.

[Petitlu]

Great!
Very good results at 18x, with Mix40 and tungsten ...
Why have placed the fins in a shoe?

[jackssmirkingrevenge]

Why have placed the fins in a shoe?

I wanted to use the same dimensions of fin that I'm sending you (12mm diameter) but since this is 0.75" I had to use a sabot.

[Petitlu]

ok I understand better!
The dart arrived very straight, it's good!

[jackssmirkingrevenge]

The dart arrived very straight, it's good!

Another reason why I wanted to try the same dimensions as tungsten carbide is much denser than steel, in your case the centre of gravity will move forward and make them even more stable in flight.