I'm not planning to use it as a major component. Just enough to try and
get over the bump of AN by itself not igniting Al metal fuel reliably.
It's basically promptly available burn surface energy at neutral oxygen
balance; also should increase rate some. But it might not be enough to get
the Al burning or might be marginal at levels below where it starts to
bring up bulk detonation risk.
I don't know that the software I have adequately models the combustion
dynamics, and I don't have a safe test site at the moment for detonability
testing.
-george
On Sun, Aug 5, 2018 at 6:21 AM, DH Barr <dhbarr@xxxxxxxxx> wrote:
NG/NC ISP top out under 200 IIRC.
On Sun, Aug 5, 2018, 2:32 AM George William Herbert <
george.herbert@xxxxxxxxx> wrote:
This is probably a crazy idea, but has anyone tried adding smokeless
powder (NC/NG etc) to an AN / HTPB / Al propellant to modify burn rate and
increase Al volatility?
I'm worried about detonability but at low percentage it might work. ?..,?
Not unreasonably expensive or hard to get, very consistent (reloaders and
commercial manufacture of ammunition depend greatly on lot to lot, year to
year, decades to decades consistency...).
-george
Sent from my iPhone
On Aug 4, 2018, at 9:05 PM, <acesaroni@xxxxxxxxxxx> <
acesaroni@xxxxxxxxxxx> wrote:
Hi Chuck,
K2 is back in SoCal. Have you seen him yet? Jerry Irvine sent me a
picture of the two of them at the PRS last spring. 😊.
Anthony J. Cesaroni
President/CEO
Cesaroni Technology/Cesaroni Aerospace
http://www.cesaronitech.com/
(941) 360-3100 x101 Sarasota
(905) 887-2370 x222 Toronto
*From:* arocket-bounce@xxxxxxxxxxxxx <arocket-bounce@xxxxxxxxxxxxx> *On
Behalf Of *Redacted sender "crogers168" for DMARC
*Sent:* Saturday, August 4, 2018 7:05 PM
*To:* arocket@xxxxxxxxxxxxx
*Subject:* [AR] Re: Trimodal AP
I always remember a great description from Korey Kline of trimodal AP.
"Think of it as basketballs, baseballs, and golf balls". The micron
sizes may be a little off, but you can visualize how the different sizes of
AP will pack together tighter.
Chuck Rogers
Who once with Korey Kline had to change the formulation of a propellant
and go through the entire re-characterizing testing again (Kn - chamber
pressure, chamber pressure - burn rate) because we adjusted the trimodal AP
mix so we would run out of the different drums of AP at the same time.
(And not have a quarter drum of X left, or a one-third drum of Y left, etc.)
In a message dated 8/4/2018 9:51:12 AM Pacific Standard Time,
acesaroni@xxxxxxxxxxx writes:
This is very dependent on the size, distribution and quantity of other
solids in the formulation such as aluminum powder as well as ballistic
modifiers such as SSFO, ALO2, Guignet green etc. If you are using a
surfactant, that also comes into play. Most APCP is more than bi-modal or
trimodal in terms of solids. Only oxidizers seem to be referred to in this
regard.
Most workhorse commercial propellants are bi-modal as far as oxidizers
are concerned BTW. This is primarily for mechanical properties, ballistics
and economics. 200 mu is the baseline feedstock with everything else being
site milled from that. 90 and 400 have expensive surcharges. Those sizes
are sometimes used in specialty formulations such as 90/10/1 for example or
in the case of 400, gas generators, slower burn rate propellants, delays
etc. Until a few years ago, 600 mu and 50 mu varieties were also produced.
AP was also FDA approved for use in cattle feed. It causes thyrosis so the
bovine fattens up quicker for market but I digress.
A good but expensive reference is “ The Handbook of Fillers for Plastics”
by Harry S. Katz. One method I experimented with many years ago to
formulate multi-modal start points was CAD believe it or not. It worked
surprisingly well.
Best.
Anthony J. Cesaroni
President/CEO
Cesaroni Technology/Cesaroni Aerospace
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:* Friday, August 3, 2018 11:51 AM
*To:* arocket@xxxxxxxxxxxxx
*Subject:* [AR] Trimodal AP
Any one know the optimum mix of 400 micron, 200 micron, and 90 micron AP?
Bill