Bill,
Yes, please share images.
What is the casing materials?
You say you’ll be screwing the fins on to the 1st stage (photos will probably
answer this question) how are you structurally attaching the fins to the casing
– I’m assuming it’s all monocoque style structure (engine casing is airframe),
so like, what are they screwed into?
Thanks,
Troy
From: arocket-bounce@xxxxxxxxxxxxx [mailto:arocket-bounce@xxxxxxxxxxxxx] On ;
Behalf Of William Claybaugh
Sent: Tuesday, 3 April 2018 1:10 PM
To: arocket@xxxxxxxxxxxxx
Subject: [AR] Re: RRS 75th Anniversary Symposium
Troy:
Not much too it. It’s mostly 1990’s amateur technology level and derivative of
the ‘96 dart booster. USC is doing far more impressive work these days.
Details:
1st stage is 9” diameter, about 90” long including a 9” to 6” transition. Just
over 69” long propellant grain (about five 14” Bates grains if that were the
plan). Compared to the standard RRS composite propellant (the Anderson /
Garboden formulation for field casting) there is about 10% more propellant mass
to be found by vacuum casting and another about 3% from going to a center
burning case bonded grain instead of Bates cartridges;that would push overall
performance toward 200 km according to the sims.
The 2ed stage is 6” diameter and 60” long and again will benefit from a center
burning and vacuum cast grain.
Payload is a 6” long cylinder topped by a 5.5:1 Von Karman; Titanium tip on the
nose.
The sims say Mach 5.2 @ 75k feet (the second stage coasts for about 20 seconds
before igniting at around 45k feet); the upper stage will require ballast to
keep to a maximum of Mach 5.2 as it probably becomes aerodynamically unstable
at about Mach 5.5...according to the sims. Thus packing more propellant may
have a practical limit w/o bigger 2ed stage fins.
I’m screwing two fins onto the first stage tomorrow and can post an image from
my workshop after that if you or others are interested.
Bill
On Mon, Apr 2, 2018 at 7:55 PM Troy Prideaux <troy@xxxxxxxxxxxxxxxxxxxxx
<mailto:troy@xxxxxxxxxxxxxxxxxxxxx> > wrote:
Bill,
Can you enlighten us a bit on your project? Sounds exciting.
Regards,
Troy
From: arocket-bounce@xxxxxxxxxxxxx <mailto:arocket-bounce@xxxxxxxxxxxxx>
[mailto:arocket-bounce@xxxxxxxxxxxxx ;<mailto:arocket-bounce@xxxxxxxxxxxxx> ] On
Behalf Of William Claybaugh
Sent: Tuesday, 3 April 2018 3:53 AM
To: arocket@xxxxxxxxxxxxx <mailto:arocket@xxxxxxxxxxxxx>
Subject: [AR] RRS 75th Anniversary Symposium
The RRS will be hosting a Symposium at the Gardena, CA Community Center on
Saturday, 21 April to celebrate the 75th Anniversary of the Society.
I will be showing my two-stage, 150km capable hardware at the Symposium.
Detains are in the attached brochure.
Bill