Ok Pauls random H2O2 CAT thought thought....
You start with flat sheets of catalyst material then punch round parts out
of them..
stack the round parts...
This is a constant area cross section cat pack.
You can do some optimization by having finer screens at the beginning, but
mostly constant area.
The wall area where you have to put anti channeling rings for a cat pack
of area A gets worse as
you go to a smaller cat pack ie 2PiR/pir^2
Now suppose that you build the cat pack as a hollow spool....
The Catpack material is rectangular (no waste) and is wound around the
spool...
The as the H2O2 goes from liquid at the center to Gas at the outside the
area of the cat pack increases
So one would expect a lower pressure drop. One can increase the length of
the tubular section without increasing
the anti channeling area....
Now getting the gas turned around and going in the Correct direction may be
hard...
On Fri, Sep 16, 2016 at 11:13 AM, George William Herbert <
george.herbert@xxxxxxxxx> wrote:
Tantalum-Tungsten (Ta-W10) is being explored for rifle barrel liners with
apparently near zero wear / indefinite lifetime
I don't know how analogous that wear is to peroxide cat beds but it's
something to look at...
Sent from my iPhone
On Sep 16, 2016, at 9:37 AM, Henry Vanderbilt <hvanderbilt@xxxxxxxxxxxxxx> wrote:
niobium wire. I have no idea how chemically suitable that would be, but I
I see that, among other combinations, you can buy platinum-iridium clad
would think it'd be fine for 99% peroxide temperature-wise.
tantalum-tungsten wire. Anyone knowledgeable care to comment whether
http://www.anometproducts.com/content/precious-metal-clad-wire
There are all sorts of other combinations available, including clad
anything there is potentially interesting for HTP cat-packs?
On 9/16/2016 7:18 AM, Henry Vanderbilt wrote:
Just out of curiosity, anyone have a source and price on pure
platinum/palladium mesh or wire? On plated mesh or wire? It occurs to
me that it might be overall cheaper to bite the bullet and pay, say,
$10K per engine, than to put more time and effort into finding a cheap
alternative for HTP cat-packs when that's already soaked up so much time
and effort to no avail.
Henry
On Thu, Sep 15, 2016 at 1:33 PM, William Claybaugh
<wclaybaugh2@xxxxxxxxx
The 98% peroxide thrusters developed--but not used--for X-37
used woven screens in more or less the conventional manner used
for silver. They worked w/o incident in testing.
Bill
On Thursday, September 15, 2016, Randall Clague
<rclague@xxxxxxxxx
<javascript:_e(%7B%7D,'cvml','rclague@xxxxxxxxx');>> wrote:
ERPS tested platinum/palladium beads in 1994. The beads
work fine in an ashtray, as ERPS demonstrated during their
talks at Space Access '94 and '95. (In '95 they scorched
the tablecloth, and they were asked not to repeat their
demonstration.)
Video of a test ERPS did with a platinum/palladium bead
catalyst pack shows that the exhaust starts out white, goes
clear, then turns tan. Post-test inspection showed that
many beads were crushed or absent. The tan exhaust was
interpreted as pulverized catalyst departing the engine, and
their hypothesis was that the beads lost structural
integrity due to thermal shock.
-R
On Wed, Aug 24, 2016 at 11:46 PM, William Claybaugh
<wclaybaugh2@xxxxxxxxx> wrote:
I'm pretty sure that Platinum / Palladium cat beds are
proven to work just fine and last forever running 98%
Peroxide.
Bill
