There ya go – good find Craig :)
Hey, you can post to the list now - cool :)
Troy
From: arocket-bounce@xxxxxxxxxxxxx [mailto:arocket-bounce@xxxxxxxxxxxxx] On
Behalf Of Craig Strudwicke
Sent: Wednesday, 2 December 2015 2:32 PM
To: arocket@xxxxxxxxxxxxx
Subject: [AR] Re: Question for the solids guys...
This looks suitable :
http://www.gp-chemicals.com/GP_5018_Resin
On Wed, Dec 2, 2015 at 10:54 AM, Troy Prideaux <GEORDI@xxxxxxxxxxxxxxxx
<mailto:GEORDI@xxxxxxxxxxxxxxxx> > wrote:
Bill, unfortunately it’s not available anymore. It was actually manufactured
just across town from me. It’s 2 part a phenolic laminating resin that allows
you to laminate glass or carbon fibre material much like polyester resin except
with the addition of an oven baked post curing process.
The last batch I purchased was in 2000 which I still use today, but there’s not
much left. Surely there’s a substitute for it over there?
www.propulsionlabs.com.au/Phenolic_Resin\Resinox_Resin.pdf
<http://www.propulsionlabs.com.au/Phenolic_Resin/Resinox_Resin.pdf>
Regards,
Troy
From: arocket-bounce@xxxxxxxxxxxxx <mailto:arocket-bounce@xxxxxxxxxxxxx>
[mailto:arocket-bounce@xxxxxxxxxxxxx <mailto:arocket-bounce@xxxxxxxxxxxxx> ] On
Behalf Of William Claybaugh
Sent: Wednesday, 2 December 2015 1:22 PM
To: arocket@xxxxxxxxxxxxx <mailto:arocket@xxxxxxxxxxxxx>
Subject: [AR] Re: Question for the solids guys...
Troy:
Where do you get carbon / phenolic?
Bill
On Tuesday, December 1, 2015, Troy Prideaux <GEORDI@xxxxxxxxxxxxxxxx
<mailto:GEORDI@xxxxxxxxxxxxxxxx> > wrote:
I’d be surprised if a typical expansion cone (especially most of a high
expansion cone) was constructed of carbon-carbon. Throat – yup, sure, but as
I’ve said previously - a very substantial fraction of a high expansion cone
will see relatively low temperatures and extremely low pressures. No I haven’t
constructed a vacuum optimised solid expansion cone, but if I did, I’d do it
exactly the same way I’ve been making my nozzles for the last 20 years –
graphite throat with carbon-fibre/phenolic composite expansion section and yes
I could do it for a reasonable flight weight without too much fuss. Sure, if
the burn time was reasonably long or motor was of substantial enough impulse,
then I might have to implement a carbon-carbon throat and take extra measure to
handle the thermal energy.
To illustrate just how cold the exhaust flow can get for vacuum optimised
expansion – a typical LH2:LOX engine that’s being expanded to something close
to vacuum conditions will form *icicles* on the aft edges of the expansion cone.
Troy
From: arocket-bounce@xxxxxxxxxxxxx <mailto:arocket-bounce@xxxxxxxxxxxxx>
[mailto:arocket-bounce@xxxxxxxxxxxxx] On Behalf Of Paul Breed
Sent: Wednesday, 2 December 2015 12:31 PM
To: arocket@xxxxxxxxxxxxx <mailto:arocket@xxxxxxxxxxxxx>
Subject: [AR] Question for the solids guys...
If one was going to build a solid vacuum stage,
has anyone on this list built a flight weight high expansion ratio solid motor?
Clearly just turning a steel or graphite solid expansion cone is either low
expansion ratio or not flight weight.
If its a simple long tubular solid the expansion cone is going to have to be
bigger than the case diameter....
Looking at professional vacuum stage solids one sees carbon carbon expansion
bells and fuel geometries that aren't the simple tubular solids that typify the
amateur solid...
Like:
http://104.131.251.97/spacerockets/wp-content/uploads/sites/17/2015/08/9166357_orig.jpg
)
