CD3 Recovery Systems
up in the late 1900’s has exposed us to the birth and evolution
of rocketry in the United States, not only in government activities,
but in the hobby and amateur realm as well. This interest and
growth in hobby rocketry has created an industry that now provides
products to rocketeers, from the entry-level needs of hobbyists
to the advanced needs of amateurs. People are building rockets
equipped with downlink video, or onboard video cameras. Flight
computers are available from many manufacturers, utilizing things
like 12 bit processors, accelerometers and barometric sensors,
GPS, flight data recording capabilities, expansion boards and
sophistication of hobby rocketry presents new challenges. Traveling
in excess of Mach is commonplace. Building rockets using advanced
techniques is important, like using carbon fiber or Kevlar for
airframes, graphite plates for fins to eliminate flutter, proper
aerodynamic modeling to insure the rocket will fly in a stable
manner and so forth.
One area of
rocketry that has interested me over the years is that of recovery.
There had to be a better way to separate a rocket than lighting
some nasty black powder. I was tired of ruining expensive parachutes,
burnt recovery lines, Nomex stuffed everywhere, powder residue
everywhere and the danger of the powder going off.
In the Black Rock desert where we launch each year, there has
been an increase in the number of rockets that were not recovered
when flown over 20,000 ft. For several years, discussions centered
on why this was occurring. Every rocket flown high seemed to fail
in recovery and crash.
to use more black powder charges to offset the lack of air. People
said that there was no oxygen up there. People said it was computer
failures. Every theory was wrong.
was a need for a system that eliminated black powder charges that
could be used in all rockets, low flying and high flying. So,
Steve Preston, Henry Reygoza Rob Briody and myself decided to
figure out why virtually all rockets launched to high altitudes
crashed. If that was solved, a product could be made that would
not only benefit rockets flying to lower altitudes, but it could
be used in the high flying rockets where there was currently no
method to address the high altitude problem.
and built a vacuum chamber to simulate altitudes experienced in
rocketry. The results were astonishing.
over 20,000 ft showed a drop-off of burn in all pyrogens tested,
not just black powder but smokeless powders as well. Rob Briody
made some nitrocellulose based and potassium based pyrogens that
produced the same results.
Even a Daveyfire
electric match wouldn’t burn over 55,000 ft. Only the contact
and the dipped pyrogen touching the contact burnt. The rest of
the pyrogen on the tip remained!
Professor Twiggs of Stanford recommended that I contact NASA to
ask them why this might be happening. I received a call back explaining
to me that things cannot burn in a vacuum due to the lack of air
molecules needed for transferring the heat energy to the next
molecule. With a lack of air as a heat transfer medium, there
is no way to continue the combustion and maintain the needed ignition
is that of expanding gasses. When a gas expands it cools. So,
when a pyrogen burns, the gasses created expand and cool. FAST.
This cooling also self extinguishes the burn since the ignition
temp of the pyrogen is not maintained and no spark or catalyst
is still present. And, the expanding gasses pull away from the
surface of the burn.
many design choices, the current CD3 unit evolved. It has been
tested in a vacuum chamber where a total vacuum was held for 1/2
hour and worked perfect.
also designed to mount in to as many flight configurations as
possible right out of the box. CO2 cartridge sizes from 12 gram
to 38 gram are used in the CD3 system. For the larger rockets,
the “El Grande” unit is now available. It uses either
92 gram or 120-gram cartridges.
are manufactured in Santa Clara, California by Visger manufacturing,
a leader in manufacturing and machining in Silicon Valley at their
multi-million dollar facility. You will love using this product
in your next rocket.
Monster Motor Systems
2005, we introduced rocket motor hardware. Our rocket motor hardware,
in the 29 millimeter sizes and above, features hard anodizing
on the rear closures and on forward closures on the 29,38 and
54 millimeter sizes. This hard anodizing (commonly called Type
111 anodizing) is a far superior coating than reqular sulfuric
anodizing (commonly called type 11 anodizing). During sulfuric
anodizing, no metallics are involved other than aluminum. Unlike
Type 11 electro-deposited metallic plating, where plating builds
up by depositing on a base metal, an anodic Type 111 coating penetrates
and grows on the base metal by converting aluminum to aluminum
oxide. Hard coating enhances electrical insulating properties
and makes the substrate twice as hard as stainless steel.. The
ratio of growth/penetration for anodic coatings is typically 50/50,
or in other words, the thickness of the hard anodized is a combined
thickness of penetration thickness and build-up thickness. Some
features of Hard anodizing are below:
wear as well as or better than hardened steels (HRC values of
70) as judged by Suga and Taber Wear tests.
- Can achieve
salt spray resistance in excess of 1000 hours.
- Good for
salvage work of parts with critical dimensional specifications.
- Can achieve
very tight tolerances.
- High dielectric
strength to 2000VDC.
- Heat dissipation
comment from an anodizing company president
The toughest is hard anodizing. "I get a charge out of telling
a group of engineers that I can make the surface of aluminum 30-35
points from being as hard as a diamond. You can't cut it with
a file. It is about 65-70 Rockwell hard. That is one of the reasons
it is used in so many critical applications."
This is the
reason Rouse-Tech chose to feature hard anodizing on these parts.
We also know that many rocketeers forget to clean their motors
in a timely manner. The hard anodizing will give extra protection
to those neglected parts! The forward and aft closures experience
the worst a rocket motor has to offer. There are few environments
more rude, than the environment a rocket motor's forward and rear
closure will experience during a burn.
line includes every piece of hardware needed for every Aero-Tech
RMS (tm) motor. We start with our 18 millimeter hardware set and
finish off with the 98 millimeter hardware. And, its all in stock
ready for your launch.