Well all the motors were made exactly the same. Two had RIO and katoed, two
were plain KNSU and didn't kato. The design works fine with and without RIO
when new.
On Mon, 04 Mar 2019, 5:28 PM Bill Kuker, <bkuker@xxxxxxxxxxxxx> wrote:
Huh, just a couple weeks ago I went 3 CATOs for 4 motors on a design that
had a perfect 14/14 success rate previously. KNDX grains were stored in
fridge with desiccant for 2+ years. I always use a KNSU header grain with
KNDX for fast ignition, those grains were fresh.
I also had my first PVC motor CATO experience. It does shatter into small
pieces, but they do not travel far at all because of their high drag to
weight ratio. I already knew this from... extensive non-rocket pvc
exploding shenanigans... but confirmed it for real. Be safe though, my
anecdote does not by itself constitute a final conclusion on the matter.
On Mon, Mar 4, 2019 at 10:05 AM Richard Nakka <richard.rocketry@xxxxxxxxx>
wrote:
But did these motors have the same safety margin? Perhaps these motors
that did not CATO were more tolerant to higher pressure.
Richard
On Mon, Mar 4, 2019 at 8:36 AM Nikolai Nielsen <
nielsen.nikolai86@xxxxxxxxx> wrote:
i had some motors of the same size and age that didnt have RIO and they
didnt kato. the RIO is doing something
Nikolai Nielsen
On Mon, 4 Mar 2019 at 16:29, Richard Nakka <richard.rocketry@xxxxxxxxx>
wrote:
My experience regarding long term storage is with KNSU, KNSB and KNDX.
I've used both KNSB and KNDX after being stored for about a year with no
noticeable change in performance. Storage was in redundant zip-lock bags at
room temperature in a relatively low humidity environment (approx. 60% +'/-
10%). I've stored KNSU for long durations in a zip-lock bag in a freezer
with similar results (this is probably your best bet for storage). As noted
by others, *never *store your grains with desiccant for more than a
week or so. The residual moisture is sucked out and the burn rate increases
enough such that a CATO could result when fired (depending on your safety
margin). Moisture is a burn rate inhibitor. I'm guessing but the effect
could be exacerbated by RIO.
On Sat, Mar 2, 2019 at 5:24 PM Nikolai Nielsen <
nielsen.nikolai86@xxxxxxxxx> wrote:
6 months to a year and KNSU
On Sun, 03 Mar 2019, 1:09 AM 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:
has a limited life span in terms if usability. I tested some old motors
I've recently observed that old fuel (atlest fuel with RIO in it)
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?
