Well it wouldn't be the first time a hygroscopic propellant was made, just
seal the motor until ready for use. But that ISP is worth fighting for.
Add my ingredient X and that's 280 to 300 Sec, Now that's performance!
On Thu, Jul 9, 2020 at 7:26 PM 1bcjolly <1bcjolly@xxxxxxxxxxxxx> wrote:
Ken, According to my references, PPG propellants have an ISP of 262 @ 84%
solids loading and 18% aluminum powder. Heat of formation is -90.0
Kcal/100 grams and C 5.1184, H 10.3371, O 1.7563. PPG propellant was used
in the Hawk missile originally. Troy accurately reported that PPG has
moisture sensitivity problems in mixing and casting. Propellant using this
binder fell into disuse because it absorbed enough moisture over time to
dissolve some of the ammonium perchlorate thus forming an ionic solution
that resulted in moisture imbrittlement due to polymer chain breakage thus
causing the finished propellant to lose its elongation abilities.
Barry
Sent from my Sprint Tablet.
-------- Original message --------
From: roxanna Mason <rocketmaster.ken@xxxxxxxxx>
Date: 7/9/20 20:00 (GMT-05:00)
To: arocket@xxxxxxxxxxxxx
Subject: [AR] Re: Amateur thermoplastic binder solids
No you're not, my computer somehow put my response in drafts and it just
turned up.
I am curious if PPG does indeed have an unexpectedly high c*.
On Thu, Jul 9, 2020 at 4:50 PM Anthony Cesaroni <anthony@xxxxxxxxxxx>
wrote:
I missed that. My bad.
Anthony J. Cesaroni
President/CEO
Cesaroni Technology/Cesaroni Aerospace
http://www.cesaronitech.com/
(941) 360-3100 x1004 Sarasota
(905) 887-2370 x222 Toronto
*From:* arocket-bounce@xxxxxxxxxxxxx <arocket-bounce@xxxxxxxxxxxxx> *On
Behalf Of *roxanna Mason
*Sent:* Thursday, July 9, 2020 7:33 PM
*To:* arocket@xxxxxxxxxxxxx
*Subject:* [AR] Re: Amateur thermoplastic binder solids
We were talking about two different applications, the PG for a heat
transfer medium for the asphalt double boiler
and the PPG as a fuel/binder.
On Thu, Jul 9, 2020 at 7:44 AM Anthony Cesaroni <anthony@xxxxxxxxxxx>
wrote:
Propylene glycol and polypropylene glycol (PPG) are two different but
related chemicals.
Anthony J. Cesaroni
President/CEO
Cesaroni Technology/Cesaroni Aerospace
http://www.cesaronitech.com/
(941) 360-3100 x1004 Sarasota
(905) 887-2370 x222 Toronto
*From:* arocket-bounce@xxxxxxxxxxxxx <arocket-bounce@xxxxxxxxxxxxx> *On
Behalf Of *ken mason
*Sent:* Wednesday, July 8, 2020 7:40 PM
*To:* arocket@xxxxxxxxxxxxx
*Subject:* [AR] Re: Amateur thermoplastic binder solids
Exactly DH, non toxic Propylene Glycol was my thoughts, available at auto
parts stores as antifreeze coolant and in my cars radiators.
Theoretically water under pressure with a calibrated relief valve so the
temp can never exceed a safe temp. Depending on the grade of asphalt no
relief valve just melt/mix at the boiling point of pure water. I tested my
asphalt sample at the BP of water, 219F at my elevation, and it was at a
workable viscosity. I don't have a Haake viscometer like at Edwards but it
was about like R-45 at RT maybe a bit thinner.
K
On Wed, Jul 8, 2020 at 4:32 PM DH Barr <dhbarr@xxxxxxxxx> wrote:
For the amateur with a double boiler and appropriate ratios of alcohol,
water, and glycol; one should be able to precisely target arbitrary
temperatures across a fairly wide range ( boiling point of pure alcohol
through boiling point of pure glycol ).
On Wednesday, July 8, 2020, Troy Prideaux <troy@xxxxxxxxxxxxxxxxxxxxx>
wrote:
IIRC it's a technique also employed for gelatine processing in capsulewindow
manufacture for drugs. I vaguely recall gelatine has quite a narrow
of temperature where it will stay liquid - around 60deg C orthereabouts; so
a heating jacket is employed using steam, but due to the lowertemperature,
its pressure is reduced to near vacuum to ensure boiling and uniformsteam
dispersion throughout the heating jacket.arocket-bounce@xxxxxxxxxxxxx]
Speaking of vacuums, you can also utilise a partial or full vacuum to
increase the safety margin of propellant processing utilising elevated
temperatures ie. it's much harder to ignite propellants under vacuum
conditions.
Troy
-----Original Message-----
From: arocket-bounce@xxxxxxxxxxxxx [mailto:
Onyou
Behalf Of Henry Spencer
Sent: Thursday, 9 July 2020 7:19 AM
To: Arocket List <arocket@xxxxxxxxxxxxx>
Subject: [AR] Re: Amateur thermoplastic binder solids
On Wed, 8 Jul 2020, William Claybaugh wrote:
My sources say AP ignites a little above 400 degrees F so a binder
that forms a low viscosity fluid at around the BP of water will in
theory work fine if there is no possibility of hot spots.
If you can find something that works *at* the boiling point of water,
canfor
use steam heat (with a steam source that heats the water, not the
steam) to ensure it just can't go any hotter.
(This technique is, or was -- my info may be out of date -- widespread
fillingstirring.
munitions with TNT, which is a fairly-stable liquid at 100degC.
That helpful property is one reason why TNT became so popular.)
If I were going in that direction I would want to automate the mixing
rather than stand over an open pot of hot binder, AP, and Al,
from a
If one must pre-fix fuel and oxidizer :-), especially hot, doing it
distance
makes a whole lot of sense.
Henry