You don't appear to have any experience with amateur rocketry. Although perchlorate based grains can be tricky, zinc-sulphur propellants can be used safely. (My friends and I flew 24-inch ZnS rockets to altitudes approaching 10k feet and Mach 1.8 while in HS.

Titanium and other exotic metals are unnecessary today. Composites can easily do the trick. As for actuators, with the right designs, amateur aircraft servos can suffice although I have seen pneumatic ones used also.

I haven't tested nor seen others evaluate the efficacy of smartphone motion sensors for combat situations but there are discrete COTS components whose specs fall within the needed ranges.

Warheads are generally scaled up shotgun shells. Flachets, ideally from tungsten but cast steel will do, are better than metal shot.

As for safety even commercial military arms fail. I certainly wouldn't want to test even the later protyped. ISIS forces seem to have created some excellent munitions using rather rudimentary materials but clever engineering. No reason to think those living in a developed country with access to common materials and a good garage foundry and machine shop can't do better.

On Thu, Aug 30, 2018, 7:14 AM Steve Kinney <admin@pilobilus.net> wrote:

On 08/30/2018 12:44 AM, Steven Schear wrote:

> Not directly and certainly not the metal combustion chamber or nozzel.
> Probably not the parts exposed to high aerodynamic forces either but
> these are easily made using common and inexpensive metal shop
> fabrication means.

Common and inexpensive means of fabricating titanium alloy parts,
aerospace guidance systems and servomechanisms, high energy propellants
and explosives, etc. And integrating them into one system that does not
blow up when the "fire" button is pressed, killing the users.

If you want to play with backpack portable anti-aircraft weapons, you
have three options: Buy them, steal them, or promise Uncle Sam you will
shoot down the planes of his choice while wearing someone else's uniform.

Let's imagine that you have managed to get hold of, for instance, a
couple of crates of real live stinger missiles, with manuals etc., all
airworthy and ready to go: Start using them to off pigs. What happens?
A state of emergency, martial law, a coast to coast and international
manhunt using every surveillance database and collection method known to
man. Forensics teams will find exactly where in the supply chain you
got your missiles, and investigators will work forward from there and
backward from the scene of the crime until they meet in the middle: You
and your team.

Would the public rise up? A lot of them would, to help find you: John
and Jane Q. Public generally don't approve of politically motivated
murder, unless it's been explained in advance by trusted media outlets
on the basis of some overriding "necessity", sugar coated, and the
gruesome details hidden from them. Your project would get the full
demonization treatment and "propaganda works."

Solve all of the above problems and proceed: You will discover that
killing scapegoats does not repair systemic disorders hard wired into
the fabric of daily life and business as usual in a country with
hundreds of millions of citizens.

:o/

> On Aug 29, 2018 9:13 PM, "Steve Kinney" <admin@pilobilus.net
> <mailto:admin@pilobilus.net>> wrote:
>
>
>
> On 08/29/2018 10:07 PM, Steven Schear wrote:
> > Stingers seem to be the deciding element for the Soviets in their
> > withdrawal from Afghanistan.
> >
> > Wasn't it Isaac Asimov that used gene-targeted assassination as the
> > major plot element in one of his stories?
>
> Isn't it you who seems to believe that 3D printers can make guided
> missiles?
>
> From there to "ragtag rebel hipsters" making biological weapons to wipe
> out scapegoat families ain't a long stretch, as both both reflect an
> infantile fantasy life with no significant grounding in material
> reality.
>
> Why not 3D print a few kilos of heroin to fund your rebellion? Or if
> that's not your bag, why not 3D print diamonds? Or gold?
>
> :o)
>
>
>
>