Might not be hot enough or produce enough flame but Terry had good ideas,
Thanks,
K
On Thu, Oct 29, 2020 at 1:19 PM DH Barr <dhbarr@xxxxxxxxx> wrote:
You can get Black Jack as well, except it's listed under smoke/delay
rather than propellant.
On Thursday, October 29, 2020, Terry McCreary <tmccreary@xxxxxxxxxxxxxxx>
wrote:
Unfortunately the only propellant grains under 24 mm diameter are "18mm"Blue Thunder grains (slightly over a half-inch diameter). The sparky
propellants Metalstorm and Metalstorm DM both produce smoke (white and
black, respectively) but are only available in 54mm and larger diameters.
1/16"-1/32" per second at atmospheric pressure. You'd want to check with
I don't know how fast they burn but most AT propellants burn at
them for better numbers.
square (or octagonal, cut the corners off the square) grain from a larger
If a cylindrical grain is not a requirement it would be simple to cut a
chunk, and coat the outside with epoxy or some other inhibitor. A large
old-fashioned cork borer, properly sharpened, would give nice cylinders.
Might take some experimentation to get it right.
aluminum/magnesium/zinc oxides. At a guess, Metalstorm DM's black smoke is
BTW my understanding is that Metalstorm's white smoke is
either carbon from a fuel-rich propellant, or elemental zinc in aerosol
form, vaporized in the chamber.
the rest of my rocket equipment, I'm considering just that, Aerotek grains.
Best -- Terry
On 10/29/2020 2:15 PM, roxanna Mason wrote:
Because my liquid rocket ignitor fabrication kit was stolen, along with
I just need to look at the compositions to get the closest match to mine
which has Mg filings loaded into 3/4" estes cardboard body tubing. Sounds
like you know the various grains better than I do which is next to nothing.
Requirements are slow burning,i.e. 1/16"/sec @ 1atm lots of sparks and a
smoky/rich exhaust. 34" long grains give a 10-12 sec burn time. The
ignitors are for that Texas high school 1.5KLbF LOx/Kerosene flight rocket
to be flown at FAR.
Thank you for any help,tmccreary@xxxxxxxxxxxxxxx> wrote:
Ken
On Thu, Oct 29, 2020 at 11:51 AM Terry McCreary <
of Blue Thunder(TM) propellant, just under an inch in diameter, cast in
Are commercial composite propellants unsuitable for this? A 14" grain
cardboard tubing, is $12. RCS has a dozen other propellants, slow (Black
Jack), fast (Warp-9), sparky (Metalstorm) if BT isn't suitable. They also
have a few propellants in smaller diameters, plus phenolic tubing
insulators to fit the cardboard tube if that is desirable. Not as much fun
as making your own, but reproducible and inexpensive.
https://www.rocketmotorparts.com/Blue_Thunder__Propellant_Grains/cat1577810_1952803.aspx
vigorously in an oxygen atmosphere. Burn time ~ 10 sec plus embed a
Best -- Terry
On 10/29/2020 1:10 PM, ken mason wrote:
Remove the nozzle first to extend burn time at atmospheric pressure.
I made my own custom grains formulated with things that burn
thermocouple 1/8" from the end of the grain to verify the ignitor is
burning before opening your prop valves.
dmarc-noreply@xxxxxxxxxxxxx> wrote:K
On Thu, Oct 29, 2020 at 11:03 AM Gram Nylen <
small Estes motor in some kind of orthogonal mount flush to the chamber
This is just an inexperienced shower thought, but could one use a
wall as a liquid engine igniter?
wrote:
On Oct 29, 2020, at 10:58 AM, Doug Jones <rocketplumber@xxxxxxxxx>
serve as a team building exercise that improves confidence. Once you have aI second the recommendation for a spark torch igniter, which will also
reliable ignition system your team can move on to the next level.
rocketmaster.ken@xxxxxxxxx> wrote:On Thu, Oct 29, 2020, 10:55 AM roxanna Mason <
for an ignition system. TEB costs an order of magnitude more,i.e. $20 vs
From personal hands-on experience with TEA it's not ,my first choice
$200/gallon as of 20 years ago. It depends on what you're igniting, how
many times,how often, ground vs flight,etc.. I prefer a pyro for one shot
or limited cycles and a so called 'torch' ignitor for multiple and
repeatable ignitions.
Rocket.Pioneer@xxxxxxxxx> wrote:K
On Thu, Oct 29, 2020 at 4:04 AM Dr Edw Jones <
tetraethyl compounds?
Any guidelines for storage and handling of small amounts of these
--Any recommended purveyors of small amounts?
Thanks, Edward Jones
Dr. Terry McCreary
Professor Emeritus
Murray State University
Murray KY 42071
--
Dr. Terry McCreary
Professor Emeritus
Murray State University
Murray KY 42071