If they are stored in an airtight box with calcium chloride dessicant, the
water could be coming out of the propellant. Water supresses burn rate, so it
it is removed, it can cause catos.
On Saturday, March 2, 2019, 11:34:49 PM UTC, Nikolai Nielsen
<nielsen.nikolai86@xxxxxxxxx> wrote:
They are stored in an airtight box with calcium chloride dessicant. It sits in
the shed. I also have some fuel grains in the same box, same age as well I
think, no RIO tho, they aren't cracked. The cato'ing also was happening with
the small rammed powder motors(similar age) which I highly doubt would be able
to develop cracks.
On Sun, 03 Mar 2019, 1:29 AM Alex Kuehn, <awkpilot@xxxxxxxxx> wrote:
Is it possible your grains are simply developing cracks over that amount of
time? Seems unlikely to me that it's a chemical change, but I could see them
cracking if there's temperature, humidity, etc, change in the area you're
storing them for example.
-Alex
On Sat, Mar 2, 2019, 5:09 PM Ben Brockert <wikkit@xxxxxxxxx> wrote:
What is "old" in this context? And is this KNSB or plain sugar or
sugar/corn syrup or what?
On Fri, Mar 1, 2019 at 8:33 AM Nikolai Nielsen
<nielsen.nikolai86@xxxxxxxxx> wrote:
I've recently observed that old fuel (atlest fuel with RIO in it) has a
limited life span in terms if usability. I tested some old motors that had
RIO in it and they all katoed. I also has some old powdered fuel used for
making hand rammed motors and the the motors that I make now with it all
Kato. I made new fuel and it worked fine. I suspect that maybe the RIO
catalises some side reactions that makes the fuel become unstable? Anyone
able to shed some light on what's going on here?
