[AR] APCP properties, was Re: Re: starship abort?
- From: Terry McCreary <prfesser@xxxxxxxxxxx>
- To: "arocket@xxxxxxxxxxxxx" <arocket@xxxxxxxxxxxxx>
- Date: Sat, 22 Apr 2023 17:57:14 +0000
Kevin,
You will likely get more replies if you start a new thread with a new subject
line, rather than tacking a question onto an unrelated existing thread.
The properties of APCP vary hugely with the composition. Burn rate can be
anywhere from 0.1"/s to 1"/s or even somewhat higher. Exponent anywhere from
zero to 0.6 or higher; additives can have an enormous effect. Specific impulse
from roughly 140 to 260 s. And all those figures are usually quoted for 1000
psi; ballistic properties can be greatly---even dangerously---different at
higher pressures.
To find burn rate, a, and n.....make and burn the propellant. Thermodynamic
properties can be predicted/calculated fairly accurately from composition. But
kinetic properties generally require actual testing. Changing to a different
source for some of the ingredients? Re-testing is almost a given. Many of those
who do a lot of work with APCP often buy ingredients in bulk to avoid concerns
about different properties. (Despite the fact that AP is a compound, 200 micron
AP from Gary Rosenfield is likely to be at least somewhat different in its
behavior from 200 micron AP purchased from, say, Skylighter or another
pyrotechnics source. Morphology, proportion of fines, etc.)
TM
________________________________
From: arocket-bounce@xxxxxxxxxxxxx <arocket-bounce@xxxxxxxxxxxxx> on behalf of
kevin ward <kevinward46@xxxxxxxxx>
Sent: Saturday, April 22, 2023 9:30 AM
To: arocket@xxxxxxxxxxxxx <arocket@xxxxxxxxxxxxx>
Subject: [AR] Re: starship abort?
Hi everyone...
Can anyone give all propellant characteristics of Ap\Htpb+Al (BurnSim) ?
We've found all but the burn rate a, n.
Unsure if best recipe, as well. (Shuttle SRB's ?)
Other related posts:
- » [AR] APCP properties, was Re: Re: starship abort? - Terry McCreary
- » [AR] Re: APCP properties, was Re: Re: starship abort?- roxanna Mason
- » [AR] Re: APCP properties, was Re: Re: starship abort?- kevin ward
- » [AR] Re: APCP properties, was Re: Re: starship abort?- kevin ward
- » [AR] Re: APCP properties, was Re: Re: starship abort?- kevin ward
- » [AR] Re: APCP properties, was Re: Re: starship abort?- Terry McCreary
- » [AR] Re: APCP properties, was Re: Re: starship abort?- John DeMar
- » [AR] Re: APCP properties, was Re: Re: starship abort?- David Summers
- » [AR] Re: APCP properties, was Re: Re: starship abort?- kevin ward
- » [AR] Re: APCP properties, was Re: Re: starship abort?- kevin ward
- » [AR] Re: APCP properties, was Re: Re: starship abort?- kevin ward
- » [AR] Re: APCP properties, was Re: Re: starship abort?- kevin ward
- » [AR] Re: APCP properties, was Re: Re: starship abort?- kevin ward
- » [AR] Re: APCP properties, was Re: Re: starship abort?- kevin ward
- » [AR] Re: APCP properties, was Re: Re: starship abort?- kevin ward
- » [AR] Re: APCP properties, was Re: Re: starship abort?- Matthew JL
- » [AR] Re: APCP properties, was Re: Re: starship abort?- George Herbert
- » [AR] Re: APCP properties, was Re: Re: starship abort?- kevin ward
- » [AR] Re: APCP properties, was Re: Re: starship abort?- kevin ward
- » [AR] Re: APCP properties, was Re: Re: starship abort?- roxanna Mason
- » [AR] Re: APCP properties, was Re: Re: starship abort?- jake
- » [AR] Re: APCP properties, was Re: Re: starship abort?- roxanna Mason
- » [AR] Re: APCP properties, was Re: Re: starship abort?- Henry Spencer
- » [AR] Re: APCP properties, was Re: Re: starship abort?- Henry Spencer
- » [AR] Re: APCP properties, was Re: Re: starship abort?- Troy Prideaux
- » [AR] Re: APCP properties, was Re: Re: starship abort?- John Dom
- » [AR] Re: APCP properties, was Re: Re: starship abort?- roxanna Mason
- » [AR] Re: APCP properties, was Re: Re: starship abort?- roxanna Mason
- » [AR] Re: APCP properties, was Re: Re: starship abort?- Henry Spencer
- » [AR] Re: APCP properties, was Re: Re: starship abort?- Henry Spencer
- » [AR] Re: APCP properties, was Re: Re: starship abort?- Henry Spencer
- » [AR] Re: APCP properties, was Re: Re: starship abort?- Troy Prideaux
- » [AR] Re: APCP properties, was Re: Re: starship abort?- roxanna Mason
- » [AR] Re: APCP properties, was Re: Re: starship abort?- roxanna Mason
- » [AR] Re: APCP properties, was Re: Re: starship abort?- Troy Prideaux
- » [AR] Re: APCP properties, was Re: Re: starship abort?- Henry Spencer
- » [AR] Re: APCP properties, was Re: Re: starship abort?- roxanna Mason
- » [AR] Re: APCP properties, was Re: Re: starship abort?- roxanna Mason
- » [AR] Re: APCP properties, was Re: Re: starship abort?- Troy Prideaux
- » [AR] Re: APCP properties, was Re: Re: starship abort?- Ben Brockert