MTA launch event, 2021-02-20

by Dave Nordling, Reaction Research Society


The Reaction Research Society held another launch event at the Mojave Test Area (MTA) on February 20, 2021. The weather was not cooperative for much of this day with wind gusts well beyond acceptable limits for launch (> 25 MPH). Our neighbor, Dave Crisalli and his Polaris Propulsion team, were using the Dosa Building as he had construction activities planned but were cancelled for that day. The RRS and Polaris Propulsion were glad to share the Dosa Building as we both made good use of the day.

The three planned objectives (weather permitting) for this MTA launch event were:

  • Build a new pit toilet restroom just north of the original site.
  • Conduct Solar Cat operations at the MTA
  • Conduct model rocket launches from Keith Yoerg’s new wire launcher array

THE ALL-SOLAR POWERED SOLAR CAT PROJECT

Bill Inman and his colleague, John Wells, made the long journey to the MTA from Nevada. Bill had made further improvements to the launching system and solar collector powering the Solar Cat steam rocket. He was able to and a remote tracking motor and drive system to further automate his solar concentrator, but several minor problems in setup prevented a launch that day.

Bill Inman and John Wells examine and prepare the solar collector system from the trailer at the east side of our MTA.
Photovoltaic panel mounted to the front of the collector to power the tracker.
Bill Inman and John Wells set up the latest iteration of the Solar Cat steam rocket from just west of the alpha and beta launch rails

Bill is striving to use an entirely solar powered system including a photovoltaic power system for his auxiliary functions. Because of the east to west passage of the sun through the sky, the steam rocket must be launched in a northerly direction. This is possible if done from the northern or western edges of our launch site.

Although the winds were excessive throughout most of the day, Bill could still conduct some assembly testing and even conduct steam rocket heating operations while keeping the rocket secure on the ground. Launch would only be attempted if the winds lowered in that time. Sadly, much of the day passed in correcting minor problems and system tests. The system proved ready but insufficient sunlight remained that day and launch would have to be conducted from the MTA at the next opportunity.

BUILDING A NEW PIT TOILET AT THE MTA

The society has been examining many improvements to our Mojave Test Area which has stood for over 65 years. The site has been improved over the many years but time has taken its toll and renovations are needed.

The top priority selected by our membership and visitors was the restroom facilities. Our short term plan was to build a second pit toilet while we work on plans for a more luxurious option in the longer term. This effort is viewed as a stopgap solution which will serve our society for at least a few years. Dmitri Timohovich and Wilbur Owens contributed greatly to this effort. With the many people we had at the site, we were able to start and complete the project with time to spare that day.

Our starting point for the project.
Wilbur operates the backhoe to get the trench dug for the sonotube. While Dmitri completes the wooden deck for the new pit toilet,
The precarious job of installing the sonotube once the pit is at the proper depth.
After getting sonotube vertical, the rest of the pit was filled with a few bucket loads of dirt and a few of us with shovels.
The new restroom deck gets placed and aligned with the new sonotube.
The toilet booth is removed from the original concrete platform. Our president, Osvaldo Tarditti, pauses a moment to consider how much crap our society has taken from our visitors and members alike,
The toilet booth is placed on the new platform, but first some further trimming of the sonotube must be done,
RRS secretary, Keith Yoerg, and RRS member, Dave Nordling, stand at the original concrete platform now filled flush to the surface with dirt. The task is nearly complete.
Once firmly affixed to the new platform, the toilet booth was fit checked by Dmitri Timohovich. He is signalling that our pit toilet is now ready for business.

The pit toilet project was a success thanks to both our members providing their physical and material labor and the careful planning and coordination that took place starting in this new year. This improvement project will be only one of several to come. We hope to make our remote testing site both more functional but also a bit more comfortable to all who visit us after many hours drive from the city.

LAUNCHING ROCKETS FROM A NEW MULTI-WIRE RAIL STRUCTURE

With the last hours of the day upon us, the winds had subsided to a more reasonable speed. Keith Yoerg had a few model rockets prepared for launch with commercial motors. He had also built a multi-wire launcher which is a convenient way to display and launch several small vehicles successively.

Max Timohovich (left) views the Baby Bertha and the Big Bertha rockets as they sit on the launch rail made from PVC pipe and fittings.

Second thing introduced at this MTA launch event was a four channel launch box built by Dmitri Timohovich. With a clean wood finish and a rugged latched case, this box proved its function well with the launch of three model rockets that day.

The new launch box was tested at the 2/20.2021 MTA launch event

After some glitches with the electric matches, Keith was able to launch and recover the Baby Bertha (A8-3) and the Big Bertha (A8-3) rockets. We got excellent footage of these classic model rocket types. The last of the three launches was the slightly larger Star Orbiter (E16-6) which left the rails cleanly and the recovery system deployed without issue. Although the winds had subsided sufficiently at ground level, the higher level winds carried the Star Orbiter for a long horizontal trek west well beyond the property line, After some searching, the Star Orbiter was lost to the desert hoping to be recovered

Baby Bertha leaps off the wire rail with its tiny A8-3 motor,
Big Bertha comes back under its parachute landing just to my left. This great video can be seen on the RRS Instagram account.
The last photo of the Star Orbiter as it sits on the pad before the wind carried it far to the west.

IN CLOSING

The team cleaned up the area and put away the gear at sunset. We talked about setting the next launch date in March 2021. We hope to have a new date set soon, likely after March 12th.


February 2021 Virtual Meeting

by Keith Yoerg (RRS Secretary)


The latest meeting of the Reaction Research Society took place this past Friday, February 12th and had 19 attendees – including several guest presenters. The meeting started with a discussion of the logistics surrounding the upcoming MTA launch & work event next Saturday, which overlaps with ongoing construction on Dave Crisalli’s adjacent land. The construction workers will be utilizing some of the MTA facilities, and following a discussion among RRS members it was agreed that the planned launch & work event could still be held without interfering with construction activities.

Screenshot of discussion during the monthly meeting

GUEST PRESENTATION – POLY RABBOTICS

Members from the Long Beach Polytechnic High School First Robotics Competition team made a presentation on their project and the adjustments they have had to make due to COVID-19 restrictions. Without being able to meet in person to fabricate and assemble parts on their robot, the student-run group has had to shift their work to virtual workshops and at-home competitions to keep their skills sharp. One such competition required teams of 3 to build a mini-robot able to climb a pole.

Title slide for the Poly Rabbotics presentation – checkout their cool logo!

Their team is currently meeting 3 times a week to prepare for competition later this year, which features an altered “at-home” layout. Despite the many challenges, it’s clear that this team is making the best of the situation and continuing to help their members gain knowledge and improve their skillsets.

GUEST PRESENTATION – CSULB ROCKETRY

A second guest presentation was provided by members of the Cal State Long Beach Rocketry team. They compete in the NASA Student Launch Competition which challenges teams to design, build, and fly a rocket to between 3,500 ft and 5,500 ft while carrying a drone payload. The drone must deploy away from the rocket and fly to a specific position.

Presenter Dan Dao in the CSULB campus lab in Feb. 2020.

Fortunately, this team has been able to continue fabrication work on their rocket by following strict precautions to avoid the spread of COVID-19. Their shop site is on the Starbase campus at the Los Alamitos Joint Forces Training Base, and only a small number of specific team members are allowed on site. During competition last year the team placed 12th out of 46 total entrants, and they hope to finish in the top-10 this year.

PLANS FOR THE UPCOMING MTA EVENT

The primary focus for the upcoming MTA event is construction of a new pit toilet on the property. Dimitri plans to build a wooden platform this week and transport it out to the MTA site on Saturday, along with a sonotube liner for the pit. The wooden platform will rest on posts dug into the ground, and once in place we will remove the port-a-john from its current concrete plinth and secure it to this new platform. Work on welding the new plate on the vertical test stand, clearing nearby brush, and other site maintenance could take place if time allows.

Bill Inman plans to continue work on his solar-powered steam rocket, which uses mirrors to heat water with sunlight. Seemingly unsatisfied with any energy source other than the flaming ball in the sky, Bill has decided to modify his setup so that the tracking mechanism (which automatically tilts the solar collector to track the sun) is powered by a solar panel. Bill will be testing this new setup at the next event and may attempt a launch of the steam rocket.

Mockup of the internals for Dimitri’s hybrid rocket module

Keith will bring his high power solid rockets “Charlie Horse” and “X2”, and intends to launch at least one of them. The goal of the launch will be to test whether the LoRa GPS trackers, which have been discussed at previous RRS meetings, can be used as a cheap way to track rockets. Dimitri is finishing work on a 4-pad solid rocket launch controller (a layout is shown above) as well as a water rocket launch controller, both of which should be ready for testing on Saturday. A discussion on what food should be grilled at the event was concluded immediately after Dave Nordling’s suggestion – brats.

RRS HISTORY

An additional guest with a connection to the society joined us for this meeting – Tom Hendricks. He was a member of the RRS from 1959 – 1960 while he was a student at Glendale High School. He recounted launching micrograin rockets fueled by zinc dust and sulphur, displayed a rocket nozzle he had once launched, and recalled that the only test stand at the MTA site at that time was a lone I-beam (there’s a lot more on-site now!).

Tom also mentioned that back when he was an active member, the majority of the fabrication for the RRS was provided by 1 society member who had a lathe in their home. Many current members were excited to have Tom back in the fold, and he expressed a desire to join us for an event at the MTA soon. We’re looking forward to having him!

EXECUTIVE COUNCIL MEETING RECAP

The final item of business was a recap of topics covered during the January 2021 meeting of the RRS executive council. Council members have received the recommended edits to the constitution from the 2020 Constitutional Committee, and expect to have a version ready for the voting membership to review during the March meeting.

Image of Chris Lujan explaining different setups for security cameras

Council members Keith and Larry have been working on plans to install a security camera at the MTA, and presented the current status of the project. The goal is to have a network hotspot run WiFi security cameras. The project will start with the installation of a hotpot in the Dosa building (once shipped from backorder). The plan is to power the hotspot with a solar panel and determine the installation location that provides the maximum WiFi signal range. This will allow for optimum placement of WIFi security cameras. Chris Lujan has a lot of experience with home security cameras as a result of personal research, and shared that knowledge to help with the project.

NEXT MONTHLY MEETING

The next RRS monthly meeting will be held virtually on Friday, March 12th at 7:30 pm pacific time. Current members will receive an invite via e-mail the week of the meeting. Non-members can request an invitation by sending an email to:

secretary@rrs.org

MTA launch event, 2021-01-09

by the Reaction Research Society


The Reaction Research Society held its first launch event of the new year on Saturday, January 9, 2021.  Dave Nordling was the pyro-op in charge.  We had a couple rockets prepared and some maintenance work we wanted to continue.  Dmitri Timohovich brought his whole family to the event and we enjoyed grilled burgers there at the Mojave Test Area.  The January winds were light and cool that day.  It was a good day for launch.

Bill Inman enjoys a burger in the George Dosa Building
Everyone relaxing for a short lunch before getting to launch.

Wolfram Blume brought his two-stage rocket, the Gas Guzzler.  His ramjet upper stage was rebuilt from last year’s unfortunate breakage when dropped during loading on the launch rail last year.  3D-printed plastic parts can sometimes be very brittle and care must be taken.

The 1515 launch rail was put into position with some help from Bill Inman and a few others.  Bill Inman is still working on his solar tracker for his latest iteration of the Scalded Cat.  He made the trip from Carson City to the Mojave Test Area to help others with operations and we were very thankful.

Wolfram was able to mount his booster stage on the rails and carefully erect the launcher.  The booster uses a commercial solid motor, an Aerotech “K” motor.  

Wolfram cleans the 1515 rail at the RRS MTA in preparation for mounting the booster
Wolfram’s booster sits on the launch rail

The ramjet for this first flight was loaded with water to simulate the weight, but would not be fired.  The primary goal was to demonstrate the staging and recovery systems powered only by the booster.  Wolfram went back to the loading area to complete the preparations of the upper stage. During a system checkout, the parachute deployment charge fired.  After some careful examination, the source of the problem seemed to be related to errant software commands.  Wolfram aborted his launch attempt and returned with his rocket stages for further examination back in Los Angeles.  Although the charges could be reloaded, he could not be certain that an early parachute deployment would occur and wreck his vehicle during flight.

The Gas Guzzler upper stage ramjet

Dmitri Timohovich and Waldo Stakes worked on completing the welding of the new steel plate on the vertical test stand. This plate on the vertical test stand was damaged during a test failure many years back and late last year was finally cut out and the space grinded to fit a replacement plate.  Unfortunately, the stick welding system would require a different type of welder and a more powerful source to drop a reliable weld.  The welding of the plate will be reattempted at the next event.

With the grinding complete, the plate is fitted and ready to be welded in place

The second launch of the day would be Dave Nordling’s nitrous oxide hybrid rocket.  This 38mm H-sized commercial hybrid motor kit from Contrails Rocketry (H-222 model) had a modified igniter and was mounted in a new 4-inch body made by Larry Hoffing. The prior launch attempt had issues with severing the nylon plastic filling line so the ignition energy was increased with small bit of composite solid propellant ignited by an electric match.

Several minor problems occurred during launch preparations. The nitrous bottle and manifold filling system was working well but the electrical control box failed during tests.  After some discussion, the defective switch box was removed and we were able to fire and get a clean launch

Dave Nordling leans against the old blockhouse with the second build of the hybrid rocket waiting for launch
The hybrid sits on the 1010 launch rail

We repacked the motor before launch and adjusted the vent tube to be more visible. The filling of the rocket went quickly and smoothly, only about 20 seconds before the white stream of liquid could be seen. The filling was stopped and with a short five-count and the rocket was fired. The rocket came off the rails quickly and it seemed that the modified igniter worked. The big problem was the parachute recovery switch wasn’t turned on before launch. This simple oversight would mean a rebuild would be necessary.

The simplest error can lead to sad results.

The rocket was recovered on the north end of the MTA site. It only seemed to reach about 300 feet of altitude. Unfortunately the ballistic landing broke both stages and the internal motor mounts and a complete rebuild is necessary. The motor case was parts were in tact and so it was extracted and will be reloaded,

The hybrid motor seems to arc to the north against wind.

Beckie Timohovich recorded the hybrid flight on her phone, The rocket seemed to immediately curve to the north off the rails opposite of the wind. It seems that the nylon fill line might be still holding fast despite the added solid propellant charge. The 3/16-inch nylon plastic line being strong enough to hold back the 900 psi nitrous pressure, it also poses a challenge to cut cleanly from the ignition charge. A static firing of the motor will be done next to get a better look at how well the fill line severs and measure the thrust curve directly..

The remnant of the fill line from within the hybrid after firing. The end looks smoothly extruded.

After recovering the hybrid rocket and putting away the equipment, we flew a water rocket for Dmitri’s young son. Although very simple, these things are very fun.

Max Timohovich holds the water rocket fired several times at the end of the afternoon.

The event was a partial success and there is more work to be done on our facilities including adding a new toilet facility at our site and welding in the plate on the vertical test stand. The next hybrid rocket launch may be a couple months away, but Bill Inman may have his next design of his solar heated steam rocket ready for launch af fhe MTA in a few weeks. He had his first successful flight in the Nevada desert just before Christmas. He is getting ready for a flight from the RRS MTA.

Bill Inman has his first successful flight of his solar-powered steam rocket on 12/22/2020

Wolfram seemed confident that he too might be ready to try his first launch of the Gas Guzzler at about that same time. If the next launch event occurs before the next monthly meeting on February 12, 2021, the announcement will come through the society email list.

The sun sets at the RRS MTA after a good day.

erotik shop
erotik shop
erotik shop
erotik shop
erotik shop
erotik shop
erotik shop
erotik shop
erotik shop
erotik shop
erotik shop
erotik shop
erotik shop
erotik shop
erotik shop
erotik shop
erotik shop
erotik shop
erotik shop
erotik shop
erotik shop
erotik shop
erotik shop
erotik shop
erotik shop
erotik shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop
sex shop