Anthony:
Yeah, I get that. But there must be some Prado optimal calculation as to
what is economic:
If five minutes gets a 4.7% improvement is there a theoretical basis for
estimating how much post processing vacuum time will get to, say, 80% of
what can be achieved with infinite post processing? I’m looking for an
engineering approximation here: how much additional post processing vacuum
will get a doubling of the measured increase in density, for example? Or
do I just need to run more tests at different vacuum processing times and
estimate based on the data.
Bill
On Sun, Jul 7, 2019 at 4:58 PM <anthony@xxxxxxxxxxx> wrote:
Once you've whipped a polymer composition surrounding a bunch of solid
particles full of air, simple step processes like that won't remove much
more than what is visible. The volume to surface relationship of the
dissolved bubbles doesn't have anywhere near the amount of displacement
pressure required to overcome the fluid that's trapping it. It takes hours
of mixing under vacuum to expose the trapped air to disassociate it from
the mix. You can subject a mix to vacuum for days and if it's not turning
over, the air will remain where it is. It's best not to let it get in the
mixture in the first place. You just have to accept the fact that it's as
good as it's going to get without processing under vacuum from start to
finish.
Anthony J. Cesaroni
President/CEO
Cesaroni Technology/Cesaroni Aerospace
http://www.cesaronitech.com/
(941) 360-3100 x101 Sarasota
(905) 887-2370 x222 Toronto
-----Original Message-----
From: arocket-bounce@xxxxxxxxxxxxx <arocket-bounce@xxxxxxxxxxxxx> On
Behalf Of Troy Prideaux
Sent: Sunday, July 7, 2019 6:25 PM
To: arocket@xxxxxxxxxxxxx
Subject: [AR] Re: Vacuum processing of solid propellant
Nice idea!
Troy
-----Original Message-----
From: arocket-bounce@xxxxxxxxxxxxx
[mailto:arocket-bounce@xxxxxxxxxxxxx]
On Behalf Of Doug Jones (Redacted sender "randome" for DMARC)
Sent: Monday, 8 July 2019 3:51 AM
To: arocket@xxxxxxxxxxxxx
Subject: [AR] Re: Vacuum processing of solid propellant
Perhaps you could put the mix in a funnel and extrude it through a
small nozzle into the motor case in a vacuum chamber? With a rubber
ball floating on the surface to block the funnel as it goes empty.
The slender stream of paste should outgas quite well, and rapidly
reconsolidate into a bubble-free mass in the motor. Let it sit in
vacuum for a little while to settle, then slowly ramp up pressure and
any remaining bubbles should collapse completely.
