Thanks Anthony, sounds like exactly the right thing.
Ben
On Friday, November 4, 2016, Anthony Cesaroni <acesaroni@xxxxxxxxxxx> wrote:
Cotronics makes a relatively inexpensive graphite adhesive/sealant that’s
good to well over 5000 F. Taper the OD of the graphite throat and the ID of
the nozzle convergent section to for a positive taper lock. Coat both
surfaces, drop it in and heat cure it. Standard industrial practice.
Best.
Anthony J. Cesaroni
President/CEO
Cesaroni Technology/Cesaroni Aerospace
http://www.cesaronitech.com/
(941) 360-3100 x101 Sarasota
(905) 887-2370 x222 Toronto
*From:* arocket-bounce@xxxxxxxxxxxxx
<javascript:_e(%7B%7D,'cvml','arocket-bounce@xxxxxxxxxxxxx');> [mailto:
arocket-bounce@xxxxxxxxxxxxx
<javascript:_e(%7B%7D,'cvml','arocket-bounce@xxxxxxxxxxxxx');>] *On
Behalf Of *BrianK ABQ
*Sent:* Friday, November 4, 2016 6:30 PM
*To:* arocket@xxxxxxxxxxxxx
<javascript:_e(%7B%7D,'cvml','arocket@xxxxxxxxxxxxx');>
*Subject:* [AR] Re: Alternate nozzle materials for APCP propellant
Gents,
A favorite topic of mine. Some ideas:
1. I saw one nozzle that was made from a hunk of phenolic (?) cloth tube
with a graphite throat insert. It certainly seemed like the best of both
worlds.
2. Graphite does dump so much heat to the casing. The idea mentioned of an
insulating band between it and the wall is worth looking at.
3. I just bought some carbon fiber washers that might make nice throat
inserts. They come in all sorts of sizes. The ones I got were 28mm OD, 15mm
hole, 2.5mm thick. Here's a link:
http://www.ebay.com/itm/201625351883?_trksid=p2060353.
m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
4. Firefox provides some nice insulation material. My favorite is their
graphite impregnated cloth. I use it a lot; line bulkheads, make custom
casting/liner tubes for propellant grains, etc. I'd thought of trying to
make nozzles with the carbon cloth as the main element. Haven't moved past
the thought stage yet.
On another topic. I could really use a strand burner and am not having
much luck making one. Does anyone know of one that might be for sale?Thanks.
Cheers,
Brian
On Fri, Nov 4, 2016 at 12:45 PM, Terry McCreary <tmccreary@xxxxxxxxxxxxxxx
<javascript:_e(%7B%7D,'cvml','tmccreary@xxxxxxxxxxxxxxx');>> wrote:
Hi John,
Years ago I molded small nozzles using Firefox's carbospheres and Weldwood
phenolic adhesive. They worked well enough to warrant further attempts.
They did erode somewhat, and the adhesive cured rather quickly and shrank
significantly; they should be cured under pressure to minimize that problem.
Weldwood apparently isn't available anymore but Cascophen seems to be the
same sort of product:
http://www.aircraftspruce.com/catalog/wppages/cascophen.php
Best -- Terry
On 11/4/2016 11:34 AM, John Lyngdal wrote:
Looking at alternate materials for a long burn motor design that have
lower thermal conductivity and heat capacity as compared to graphite. Right
now I'm considering machinable ceramics, BN, and perhaps molded alumina.
Any personal experience or publication links would be most welcome.
John
--
Dr. Terry McCreary
Professor of Chemistry
Murray State University
Murray KY 42071
