[AR] Re: Concussion Wind tunnel
- From: "Monroe L. King Jr." <monroe@xxxxxxxxxxxxxxxxxx>
- To: arocket@xxxxxxxxxxxxx
- Date: Thu, 04 Sep 2014 07:12:17 -0700
Well, Here in Texas it's not that hard to get a license for Dynamite.
Of course you have to do it right! You can't buy dynamite without it.
I'm not making any that's for sure.
Monroe
> -------- Original Message --------
> Subject: [AR] Re: Concussion Wind tunnel
> From: doug knight <dougchar001@xxxxxxxxx>
> Date: Thu, September 04, 2014 7:07 am
> To: "arocket@xxxxxxxxxxxxx" <arocket@xxxxxxxxxxxxx>
>
>
> Just remember BATFE permits. Not an org that believes in forgiveness over
> permission.
>
> Doug K
>
> On Thursday, September 4, 2014, Monroe L. King Jr. <
> monroe@xxxxxxxxxxxxxxxxxx> wrote:
>
> > The size of explosion I'm considering is several stix of dynamite.
> > Dynamite is also cheap! With some kind of concrete apparatus. Perhaps
> > something like a large concrete pipe in a mound facing the explosion.
> >
> > Monroe
> >
> > > -------- Original Message --------
> > > Subject: [AR] Re: Concussion Wind tunnel
> > > From: Norman Yarvin <yarvin@xxxxxxxxxxxx <javascript:;>>
> > > Date: Thu, September 04, 2014 5:38 am
> > > To: arocket@xxxxxxxxxxxxx <javascript:;>
> > >
> > >
> > > On Wed, Sep 03, 2014 at 10:57:15PM -0700, David Weinshenker wrote:
> > > >Ben Brockert wrote:
> > > >> There are times when wind tunnels give much better data than FEA, but
> > > >> for modeling something that is rotationally symmetric through a small
> > > >> range of operable flight angles the data from FEA is going to be a lot
> > > >> more accurate than something like trying to use an explosion as a very
> > > >> transient wind tunnel.
> > > >
> > > >Don't many supersonic tunnels inherently operate in a "very transient"
> > > >mode? I thought that was a common characteristic of such systems...
> > >
> > > More like "transient" than "very transient". The idea is something
> > > like "we compressed a lot of air on one end, and pulled a vacuum on
> > > the other end, and got supersonic flow for a fraction of a second
> > > after breaking the separating membrane", not "we were trying to get
> > > data from a shock wave whose thickness is measured in microns".
> > >
> > > (Shock waves are closely followed by expansion waves, after which the
> > > gas slows back down. With really huge explosions -- as in, nuclear --
> > > there can be a serious distance between the two, but for anything an
> > > experimenter in the same room can survive, the distance will be
> > > microscopic. See
> > >
> > > Atom Bomb explosion (HQ)
> > <https://www.youtube.com/watch?v=Qn5vysBkWdM#t=75>
> > >
> > > then imagine that on a much, much, much smaller scale.)
> > >
> > >
> > > --
> > > Norman Yarvin http://yarchive.net/blog
> >
> >
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