Chopped wires are often referred to as staples. Chopped PAN based carbon fibers
will accomplish similar behavior. Uniform “voids” have been attempted using
micro balloons. The result is propellant with a propensity to DDT.
Anthony J. Cesaroni
President/CEO
Cesaroni Technology/Cesaroni Aerospace
<http://www.cesaronitech.com/> http://www.cesaronitech.com/
(941) 360-3100 x101 Sarasota
(905) 887-2370 x222 Toronto
From: arocket-bounce@xxxxxxxxxxxxx <arocket-bounce@xxxxxxxxxxxxx> On Behalf Of
William Claybaugh
Sent: Saturday, June 16, 2018 7:04 PM
To: arocket@xxxxxxxxxxxxx
Subject: [AR] Re: Fast propellant
Anthony:
Thanks, my previous literature search had also suggested about 1” / sec. as a
practical maximum.
I did come across adding voids to accelerate the effective burn rate but a
quick calculation suggests that obviates the mass fraction benefit.
Wires are a good suggestion but don’t appear to safely get things in the
desired range as that would require putting a lot of heat well behind the flame
front. Chopped wires, perhaps?
Bill
On Sat, Jun 16, 2018 at 4:51 PM <acesaroni@xxxxxxxxxxx
<mailto:acesaroni@xxxxxxxxxxx> > wrote:
We use AP with mean diameters of around 10 microns for rb’s in the 1”~2” range
without adding anything that will come back to haunt you. AP that size is class
1.1D. Once you start putzing with composite propellant that burns any faster
than 2”~4”/sec., someone inevitably gets hurt. Even 1”/sec. propellant can make
things quite miserable at ambient pressure in anything more than very small
quantities if it leaps to freedom unexpectedly. The range you are proposing is
a slow explosion. Invest in some silver wire if you want to speed up your end
burner.
Stay safe.
Anthony J. Cesaroni
President/CEO
Cesaroni Technology/Cesaroni Aerospace
<http://www.cesaronitech.com/> http://www.cesaronitech.com/
(941) 360-3100 x101 Sarasota
(905) 887-2370 x222 Toronto
From: arocket-bounce@xxxxxxxxxxxxx <mailto:arocket-bounce@xxxxxxxxxxxxx>
<arocket-bounce@xxxxxxxxxxxxx <mailto:arocket-bounce@xxxxxxxxxxxxx> > On Behalf
Of William Claybaugh
Sent: Saturday, June 16, 2018 5:39 PM
To: arocket@xxxxxxxxxxxxx <mailto:arocket@xxxxxxxxxxxxx>
Subject: [AR] Fast propellant
Does anyone have any sense of how fast AP/HTTP/Al can be made to reliability
burn at reasonable pressure (say 1000 psia)?
I’m noting that if one could get around 9-10” / sec. an end-burning grain might
makes sense with rather significant effects on propellant fraction for sounding
rockets....
Bill
