Bill,
I’m curious: how does the color suggest the alloy? I’ve seen virtually all
popular 6000 grades blue anodized and I’ve seen 7075 grades blue anodized. Is
it assumed here that these parts are *hard* anodized with a particular minimum
layer thickness to serve this purpose?
Troy
From: arocket-bounce@xxxxxxxxxxxxx [mailto:arocket-bounce@xxxxxxxxxxxxx] On ;
Behalf Of William Claybaugh
Sent: Wednesday, 8 September 2021 9:32 AM
To: arocket@xxxxxxxxxxxxx
Subject: [AR] Re: JB Weld Usability
Anthony:
The color suggests the alloy, thanks.
May I ask what the “fin fillet” like pieces are on the upper two visible fins
that do not appear to be repeated on the adjacent fin roots?
Bill
On Tue, Sep 7, 2021 at 5:17 PM Anthony Cesaroni <anthony@xxxxxxxxxxx
<mailto:anthony@xxxxxxxxxxx> > wrote:
Something along those lines.
Here’s a phone shot of SL-16 from a few weeks ago after recovery.
Anthony J. Cesaroni
President/CEO
Cesaroni Technology/Cesaroni Aerospace
<http://www.cesaronitech.com/> http://www.cesaronitech.com/
(941) 360-3100 x1004 Sarasota
(905) 887-2370 x222 Toronto
From: arocket-bounce@xxxxxxxxxxxxx <mailto:arocket-bounce@xxxxxxxxxxxxx>
<arocket-bounce@xxxxxxxxxxxxx <mailto:arocket-bounce@xxxxxxxxxxxxx> > On Behalf
Of William Claybaugh
Sent: Tuesday, September 7, 2021 7:13 PM
To: arocket@xxxxxxxxxxxxx <mailto:arocket@xxxxxxxxxxxxx>
Subject: [AR] Re: JB Weld Usability
Anthony:
6061-T (something) or 7075-T7 (ish)?
I’m been focused on a bonded Ti sheet over Al leading edge but your experience
is intriguing; the Crisalli / Garboden dart hit Mach 4 at 12,000-ish feet and
was whole vehicle anodized, including leading edges.
Bill
On Tue, Sep 7, 2021 at 5:06 PM Anthony Cesaroni <anthony@xxxxxxxxxxx
<mailto:anthony@xxxxxxxxxxx> > wrote:
It’s blue anodize. I have a recovered fin on display in the office from SL-7
that my daughter fired and several boosters in the shop. I’ll try to send a
photo tomorrow. The root shock wave is also clearly visible.
Anthony J. Cesaroni
President/CEO
Cesaroni Technology/Cesaroni Aerospace
<http://www.cesaronitech.com/> http://www.cesaronitech.com/
(941) 360-3100 x1004 Sarasota
(905) 887-2370 x222 Toronto
From: arocket-bounce@xxxxxxxxxxxxx <mailto:arocket-bounce@xxxxxxxxxxxxx>
<arocket-bounce@xxxxxxxxxxxxx <mailto:arocket-bounce@xxxxxxxxxxxxx> > On Behalf
Of William Claybaugh
Sent: Tuesday, September 7, 2021 7:01 PM
To: arocket@xxxxxxxxxxxxx <mailto:arocket@xxxxxxxxxxxxx>
Subject: [AR] Re: JB Weld Usability
Anthony:
Do you color anodize (black, say) and what alloy are the leading
edges…different alloys produce different coloring w/ the same chemistry, as you
certainly know….
Bill
On Tue, Sep 7, 2021 at 4:54 PM Anthony Cesaroni <anthony@xxxxxxxxxxx
<mailto:anthony@xxxxxxxxxxx> > wrote:
I have used zirconates and titanates et al, flame sprayed using HVOF on
sections of composite nozzles with some good results in the past. CTE is the
usual issue with coatings like this. It can also difficult to do with smaller
nozzles during application due to the plasma impingent angle. In practice, it’s
a lot of work with results that can be obtained using better substrates to
begin with. The same goes for high Mach LEs and nose cone tips that aren’t
going to spend a lot of time in the atmosphere. The fins on the Space Loft
booster reach over Mach 5 and are just anodized aluminum without any fancy LE
treatments for example. The anodizing gets stripped of for the first inch or so
but that’s about it.
Anthony J. Cesaroni
President/CEO
Cesaroni Technology/Cesaroni Aerospace
<http://www.cesaronitech.com/> http://www.cesaronitech.com/
(941) 360-3100 x1004 Sarasota
(905) 887-2370 x222 Toronto
From: arocket-bounce@xxxxxxxxxxxxx <mailto:arocket-bounce@xxxxxxxxxxxxx>
<arocket-bounce@xxxxxxxxxxxxx <mailto:arocket-bounce@xxxxxxxxxxxxx> > On Behalf
Of Troy Prideaux
Sent: Tuesday, September 7, 2021 6:27 PM
To: arocket@xxxxxxxxxxxxx <mailto:arocket@xxxxxxxxxxxxx>
Subject: [AR] Re: JB Weld Usability
Mark,
I don’t think any ceramic would last long for the *hot* parts of an APCP
solid. Not only would temperature be an issue, but hot HCl would chew through
it quick smart – let alone the Al-alloy. Note though, there’s at least one
commercial N2O hybrid on the market (contrail M motor) that utilizes what looks
like an anodized (black) block of Al-alloy for a substantial section of the
expansion cone ie. Direct exposure to the exhaust flow. Again, it’s a short
burn profile.
Troy
Once I made an aluminum nozzle powder coated with ceramic. (professional powder
coating). It was a clone of an Aerotech 98mm solid b/c the nozzle was gone.
FWIW, it didn't work.
--MCS
