Speaking of guns I'm thinking about bringing back the Gyrojet.
https://www.youtube.com/watch?v=cJAXpyt8-oQ
Sounds like a fun little project. Maybe even make new ammo for the old
guns.
I think this 5-Axis machine could make quick work of the nozzles and
igniter end. Might even be able to improve the propellant somewhat.
But yeah that little device in your back pocket is a pretty good bit of
kit.
Monroe
-------- Original Message --------
Subject: [AR] Re: Star Trackers, was Re: Re: Spin stabilized rocket
From: rebel without a job <rebelwithoutajob@xxxxxxxxxxx>
Date: Wed, December 26, 2018 10:48 pm
To: "arocket@xxxxxxxxxxxxx" <arocket@xxxxxxxxxxxxx>
When distances are short, the errors are minimal; you don't need to account
for Coriolis force when shooting a rifle at a target.
Nowadays you do!
https://www.thetruthaboutguns.com/2018/01/jeremy-s/coriolis-effect-for-beginners-extreme-long-range-shooting-for-beginners/
High accuracy, long range rifles have gotten to the consumer price point. On
the upside, so have ballistic apps on smartphones.
A regular guy with a nice rifle and a cheap phone is now doing what a gun
director, a turret, and a crew of dozens did just a few decades ago.
Pretty cool.
________________________________
De: arocket-bounce@xxxxxxxxxxxxx en nombre de Norman Yarvin
<yarvin@xxxxxxxxxxxx>
Enviado: miércoles, diciembre 26, 2018 20:56
Para: arocket@xxxxxxxxxxxxx
Asunto: [AR] Re: Star Trackers, was Re: Re: Spin stabilized rocket
On Tue, Dec 25, 2018 at 02:42:35PM -0700, Monroe L. King Jr. wrote:
I've been told that an earth frame of reference won't get me to orbit.
You can do any calculation in any frame of reference; it's just harder
in some than in others. In particular, if you choose an earth frame
of reference you have to incorporate things like centrifugal force and
Coriolis force to get a correct result. That can be done, but it's
easier to convert to an inertial frame of reference and use that
instead. "Inertial" means the frame of reference isn't accelerating
like normal Earth coordinates are. (They're rotating, which involves
acceleration.)
When distances are short, the errors are minimal; you don't need to
account for Coriolis force when shooting a rifle at a target. Getting
to orbit is another matter.