MTA Launch Event, 2021-08-28


by Dave Nordling, Reaction Research Society


The RRS Mojave Test Area (MTA) was used by the student group, Michigan Aeronautical Science Association (MASA) of the University of Michigan at Ann Arbor.  Given the remoteness of the RRS MTA and the great distance that the Michigan team was willing to travel, MASA had planned an extended test campaign to use the site for their cold flow and ultimately hot-fire their RP-1/LOX 2,550 lbf liquid rocket engine.  Originally planned for a week, the team arrived on Monday, August 16th, and continued to use the MTA site through August 28th.  In the end, Michigan faculty called the end of the MASA test series as the new semester was starting and many materials needed to be returned before MASA left southern California.

The MASA logo on the back door of the mobile trailler.
Initial checks of the mobile propellant supply trailer. Over the road travel loosened a lot of plumbing joints.

MASA is a new student group to the society and had very ambitious goals in what they wanted to accomplish in the planned test series.  Typically, the RRS will work with new universities and new clients over a period of many months before agreeing to a first test series at the MTA on a weekend campaign.  Proper planning is an essential requirement for success and the RRS must become thoroughly familiar and comfortable with all planned use of the MTA site.  Like with all attendees to the MTA, indemnification waivers were required from all attendees including spectators.  MASA limited their staff to only essential personnel and ran a day and night shift to both safeguard their equipment through the night and provide continuous support to prepare for the next day’s events.  The team was able to find rented housing accommodations in the local areas of California City and Ridgecrest.

Nate Campbell verified valve functions in conjunction with the mobile control trailler.
The MASA control room was well equipped and was able to safely and remotely conduct test operations.
More leak checks under the rising moonlight and electric lamps at the RRS MTA.

MASA has had a couple years of experience with their propellant flow systems in laboratory tests at the university and was willing to hold several meetings with RRS members sharing their full test procedures and schematics, and answer questions posed by RRS pyrotechnic operators in advance of their arrival.  The MASA fluid systems had many appropriate safety features and used high quality valves and parts.  MASA has developed a control system that uses motorized needle valves in place of a pressure reducing regulator for independent propellant tank pressure controls.  MASA had conducted many tests of this system and held several tests to confirm proper operation in the early steps of their MTA campaign.

The MASA liquid rocket engine, RP-1 and LOX, rated for 4300 lbf thrust but the hot-fire goals of this campaign was 2550 lbf.

MASA’s system designs also had some problems with the nitrogen compressor (booster) system being unable to operate due to a regulator failure. The team was able to bypass the unit, but it limited the top pressure of the blowdown tests to the bottle pressure (2000 psi). A few changes were necessary for vent line routing to improve operational safety. Remote pressurization operations were safely executed but proceeded very slowly and thus a great degree of boiloff in the LN2 limited run time.

The composite overwrapped pressure vessel (COPV) originally was intended for compressed natural gas service in ground vehicles. These vessels have a good safety record in demanding applications and are often used in de-rated aerospace applications.
The MASA team made several changes to their vent line routing for improved safety.

The event was successful in some respects that it gave the students a practical understanding of how to conduct test operations under desert conditions.  It also revealed some of the shortcomings in their plumbing design (leaks) which they were able to fix well enough to get to cold flow with cryogenic LN2 and water on the last day of testing (when this report is dated).  The cold flow tests provided useful data in their control algorithm which will be useful to the next series of tests.  MASA also gained experience in safe cryogenic tanking and operations with these hazardous fluids.

MASA team proceeded into LN2 tanking of their oxidizer propellant tank for the cold flow test through their engine and plumbing.

Logistics was a big challenge for the MASA team due to errors in their communication with local suppliers.  Nitrogen and helium gas bottles were significantly delayed and cryogenic liquid nitrogen cylinders also were very late to arrive at the MTA.  Some of these problems can be easily mitigated for the next test campaign now that relationships have been better established.  sex shop While MASA was disappointed with some of the outcomes from the test series, they are interested in returning to the RRS MTA in the latter part of this calendar year.  This follow-on test series will be discussed at length in the coming months.

A gang of nitrogen bottles sit chained togeither in a pressurant feed manifold.

The society was similarly challenged in supporting this MASA campaign.   The society is grateful to everyone who assisted at the MTA (Osvaldo Tarditti, Waldo Stakes, Bill Inman and myself) or those who gave their comments and concerns (Larry Hoffing, Jim Gross).  Several members spent multiple days at the MTA both during the week and on weekends.   The RRS provided the necessary oversight during the hazardous portions of the testing campaign which was particularly difficult to schedule during weekdays.  The MASA team was very open and disciplined in their interactions with the society.  The RRS was also glad for the University of Michigan’s support and communications throughout this event.

It was a challenging event which was made possible by the contributions of many RRS members over many days.  Frequent communication between MASA faculty and the RRS was a firm requirement on all days of this tenacious campaign and the MASA team provided daily briefings on their progress.

The MASA team showed tremendous dedication and perseverance sex shop over this extended campaign in the summer heat of the Mojave deset.
Cold flow testing complete with pressurized LN2 through the oxidizer path and water through the fuel path.

This testing campaign and current RRS policies will be discussed at the next monthly meeting, 9/10/2021.  Pursuant to our mission statement, the society is glad to support sex shop projects of this kind to universities capable of conducting safe experiments at our unique testing site and to those who are willing and able to provide the society with sufficient advance notice to review their reports, schematics and inspect their hardware.  This campaign is firm proof that we will need more licensed pyro-ops and more members available to support any similarly extended test series in the future if they are accepted by the council.  By building and enforcing a consistent and fair policy for all new and prior clients, the RRS can better operate to the benefit of everyone.

All requests to use the RRS MTA must be made to the RRS president and reviewed by the executive council.  For any questions about this test series or any future test series, please contact the istanbul escort RRS president.

president@rrs.org




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August 2021 Virtual Meeting


by Keith Yoerg (RRS Secretary)


The latest meeting of the Reaction Research Society took place Friday, August 13th and had 12 attendees who came and went, including a prospective student member. We had a lot of topics to discuss and some members had erotik shop to leave early so we got right down to society business from the start of the meeting.

Screenshot of discussion during the monthly meeting

YOUTH ROCKETRY CLASS PLANNING & UPDATES

The RRS starting to plan for youth outreach classes – which have been on hold during the COVID-19 pandemic. Unfortunately, due to the delta variant the LAPD classes that were being planned for September at the Strive learning center have been postponed. However, it looks like we are on track to begin classes with the Boyle Heights YMCA after labor day.

This class is expected to have up to 60 students – which will be split into 2 groups that will attend every other Friday at 4pm on a rotating schedule. The current plan is to hold 5 classes per group, which means the program will run for 10 straight weeks. Any RRS member interested in helping during these classes will be required to complete a LiveScan background check. Please contact Frank at vicepresident@rrs.org for more details if interested.

Baby Bertha kit built by RRS Secretary Keith Yoerg

The current plan is for each student to build their own “Baby Bertha” model rocket manufactured by Estes. The EC is currently organizing logistics to allow each student an opportunity to fly their rocket twice (assuming the first launch is successful, of course!) at our MTA site in late October or early November. In addition, we are looking at the instructors building a high power rocket in tandem to show the similarities and differences between the construction methods. A demonstration flight of the high power rocket would be held on the same day as the model rocket flights, to give the kids a sense of what a more powerful flight would look like.

Discussion at the meeting included ideas around fast-drying non-toxic glue options for the model rockets, 3D printed fin alignment jigs to ensure arrow-straight flights of the kits, and logistics around the launch day like adding more low-power launch pad capabilities to the MTA site. erotik shop We may also try to add an onboard camera to the high power kit to show the students a view of the ground falling away from onboard the rocket!

PERMANENT BATHROOM & OTHER MTA UPGRADES

Progress is continuing on the permanent RRS Bathroom structure. Work on cutting holes for doors and windows has been completed on the 20-foot shipping container and delivery is expected imminently to the new work site at Wilbur’s hangar. The next stages of construction including adding plumbing, fixtures, and the doors and windows.

RRS president Osvaldo informed the membership that he purchased a forklift attachment for the backhoe that is stationed in the Mojave desert – which will be a great help with moving tanks and other heavy items that are often required for liquid rocket tests at the MTA. Members also discussed upgrading the launch structures at the site, including an idea erotik shop for an adapter to allow Alpha and Beta micrograin rockets to use the same rail system and moving over the large launch tower from the “graveyard” on the northern end of the MTA to a more permanent & upright location.

AUGUST MTA LAUNCH EVENTS

After a short review of the July MTA events (writeups by Dave Nordling can be found here and here), members were briefed on the “long campaign” work that is underway by the University of Michigan rocket club “MASA” this month. While typical events at our desert site last only 1-2 days, this campaign is expected to run for 10 or even 14 days total. The exact length of time that they will be at the site depends on how quickly erotik shop they are able to meet their objectives.

Some info on the MASA liquid engine that is undergoing testing at the MTA

The ultimate goal of the campaign is to conduct a static, hot fire of their 2,500 lbf (10s total impulse) liquid rocket engine. The engine runs on RP-1 and LOX, and utilizes liquid nitrogen and helium as pressurants. Several RRS members and Pryotechnic Operators have generously volunteered their time on both weekdays and weekends to assist the student team in erotik shop meeting their goals. A writeup of the events will be posted to this site after the testing.

OSVALDO’S MICROGRAIN ROCKET AVIONICS

RRS president Osvaldo Tarditti provided a show-and-tell of his screw type avionics switch, a very clever way to activate onboard rocket electronics when space is at a premium. This is certainly the case in the RRS Alpha and Beta micrograin rockets – which this switch was designed for. The basic mechanism uses 2 sets of electrically separated nuts with wire leads soldered on, which are epoxied to a bulkhead and affixed to the inside of the rocket’s nosecone.

Osvaldo showing his procedure for soldering a lead onto the nuts

When a screw is inserted – the circuit is completed between the nuts and the attached electronics turn on. With proper placement of the bulkhead and a hole drilled in the nosecone, this screw can be installed from the outside of the rocket just prior to launch.

The switch & bulkhead installed in an Alpha rocket nosecone – note the leads attached to both nuts.

Osvaldo completed the avionics package with a mercury switch and a cheap timing circuit board with multiple programming options. When placed together and activated on the launch pad, the mercury switch is jostled during launch which starts the countdown on the timing circuit board. When pre-programmed with the proper timing delay, erotik shop the timing board countdown will coincide with the apogee of the rocket’s flight path and deploy a parachute. The hope is that this will allow for a more consistent recovery of Alpha & Beta rockets after launches.

CESARONI TECHNOLOGY / CESARONI AEROSPACE

Late in the meeting we were joined by RRS member and rocketry entrepreneur Anthony Cesaroni, who told members more about his companies and the time he spent at the MTA back in the 90s. With locations in Toronto, Florida, and Spaceport America (New Mexico) Anthony’s companies are major players in munitions, solid rocket motors, and even liquid engine components for Virgin Galactic. Among the major projects underway currently is a full 4-stage orbital vehicle, with hopes of full launches from Wallops and Kennedy Space Center in the 2023/2024 timeframe. Members were very excited welcome Anthony back into the fold and hear about the great work his companies are doing.

RRS WEBSITE UPDATES

The final topic of the evening was regarding updates to this website. The general consensus among members was that it is time for a fresh look and modernization to the website, and there was a robust discussion of the different avenues (and associated prices) that could be pursued. Anyone interested in helping to make this a reality can contact RRS secretary Keith at secretary@rrs.org.

NEXT MONTHLY MEETING

The next RRS monthly meeting will be held virtually on Friday, August 11th at 7:30 pm pacific time. Current members will receive an invite via e-mail the week of the meeting. Non-members (or members who have not received recent invites) can request an invitation by sending an email to:

secretary@rrs.org

Please check your spam folders and add secretary@rrs.org to your email whitelist to make sure you receive the invitation.

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