Always wondered if the ribs of a rectangular, hexa- or octagonal thruster will
not become too hot? An advantage is that no lathe is required for such
geometries but fabrication is maybe more complicated.
jd
From: arocket-bounce@xxxxxxxxxxxxx [mailto:arocket-bounce@xxxxxxxxxxxxx] On ;
Behalf Of David Gregory
Sent: dinsdag 20 september 2016 22:45
To: arocket@xxxxxxxxxxxxx
Subject: [AR] Re: "Direct" Hydrogen Peroxide engines
Istar had what is referred to as a "2D" flow path, or rectangular. So yes the
individual thrusters would have been square.
On Tue, Sep 20, 2016 at 12:13 PM, <qbert@xxxxxxxxxxxxxxx> wrote:
I'm not sure what your talking about JD this cat pack was made for the ISTAR
program and Ponzo
was one of the Aerojet senior engineers on the project. There is limited amount
of the actual engine
design in the ISTAR paper but it does show a engine running. I'm not sure If
it's a flaw in the photo
or is the exhaust for that motor actually square? (page 11 of the PDF of the
attached PDF)
Robert
At 04:20 AM 9/19/2016, you wrote:
Thank you for the 2003 Ponzo pdf. This is tech an amateur can only ask
specialized companies to realize for him. Making the photo etching masks for
the platelets is the only thing an amateur could get away with as far as I can
see.
As to the internal geometry of those etch masks: they will require several
trial versions. Could take years solo.
Platelet stacks can be pressure bonded in a vacuum oven (with or without an
extra bonding metal layer) typically by putting a weight on them. Had this done
for 0.2 mm stainless sheets 10 years ago: special company again.
Could become an expensive project!
Problem with a monolithic pack is it would be difficult to inspect what the
internal erosion did without destroying is.
I wonder if Aerojet ever commercialized such monolithic packs.
jd
-----Original Message-----
From: arocket-bounce@xxxxxxxxxxxxx [ mailto:arocket-bounce@xxxxxxxxxxxxx ;
<mailto:arocket-bounce@xxxxxxxxxxxxx> ] On Behalf Of qbert@xxxxxxxxxxxxxxx
Sent: zondag 18 september 2016 22:36
To: arocket@xxxxxxxxxxxxx
Subject: [AR] Re: "Direct" Hydrogen Peroxide engines
Here's the PDF
Robert
At 02:11 PM 9/18/2016, you wrote:
Robert wrote on 180916:
That is what Aerojet did with their monolithic cat pack and I'mworking on a similar design as we are talking about this I am having a
problem understanding how they created enough silver surface to
decompose the peroxide in a half inch though. Microfluidics can achieve super
mixing, like used in monolithic multichannel chemical analyzers. But I have
not heard about those much anymore.
Do you have a URL of that particular Aerojet monolithic pack research
paper mentioning a silver catalyst layer inside?
jd
