Yes, NC is notoriously pressure sensitive - very pressure sensitive regarding
burn rate and likely ignition too. This obviously needs consideration (as I'm
sure Bill is well aware) in low pressure conditions, but there might (to a much
lesser extent) also be issues worth consideration for high pressure
environments ie. with a much accelerated burn rate.
Troy
-----Original Message-----
From: arocket-bounce@xxxxxxxxxxxxx [mailto:arocket-bounce@xxxxxxxxxxxxx] On
Behalf Of Peter Fairbrother
Sent: Monday, 26 October 2020 11:28 AM
To: arocket@xxxxxxxxxxxxx
Subject: [AR] Re: Burst disc thickness
On 25/10/2020 23:39, William Claybaugh wrote:
Troy:
That’s an ad hoc genius idea.
My concern would be that we have two different burst failure problems:
the low pressure side had to fail toward low pressure, the high
pressure side has to fight the pressure on the other side of that
disc. The charge required for the latter is obviously greater than
that required for the former. And in both cases we are venting hot
gas into our system....
It has another possible benefit - the nitrocellulose is at some controllable
pressure. Nitrocellulose can fail to ignite in vacuum.
But I still think a hot wire melting a plastic diaphragm would be simpler.
Peter Fairbrother