The UCLA Project Prometheus had reserved the RRS MTA for Saturday, July 17, 2021, for another round of static fire testing of a nitrous oxide hybrid motor on our vertical test stand. Dave Crisalli was the pyrotechnic operator in charge for that day and recorded the successful static fire. The footage will be posted on the society Instagram page soon.
This summer semester test would demonstrate UCLA’s student designed and built custom hybrid motor. Average thrust was around 300 lbf with a maximum value of 349 lbf. Total impulse recorded was 2044 lbf-sec (in the M-motor range). UCLA shared a few pictures from the event.
This was another great example of a university team success thanks to careful design, lab testing, training, planning and smart, in-the-field engineering. The RRS is glad to offer our facility and technical advice. The RRS looks forward to working with UCLA again soon.
For teams seeking to schedule the use the RRS MTA, please contact the RRS president, Osvaldo Tarditti. Always include a full project description such that the society can accurately evaluate your request.
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.
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.
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.
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.
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
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 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,
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..
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.
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.
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 Reaction Research Society’s first meeting of 2021 took place this past Friday, January 8th and was attended by 11 members. Dave Nordling provided a review of the December 2020 event at the MTA, a written account of which can be seen in the post preceding this one.
PLANS FOR THE UPCOMING MTA EVENT
The first discussion was regarding plans for the upcoming MTA event on Saturday, January 9th. Dimitri (and family), Wolfram, Bill, Waldo, and Dave (as Pyro Op) stated their intentions to attend the launch. Plans include continuing repair and replacement of the bent panel on the vertical launch structure led by Dimitri and Waldo, a launch of Dave’s hybrid rocket, a demonstration flight of Wolfram’s Gas Guzzler, and mention of a grill-out with hamburgers! Expect a launch event update on the results soon.
RESTROOM AND OTHER FACILITIES IMPROVEMENTS
The discussion continues on improving the restroom facilities at the MTA. While the Executive Committee pursues bids from contractors and other options for a more substantial restroom facility, finding a more immediate replacement for the current pit toilet is a top priority. Digging a new pit toilet should be made much easier by the recent delivery of a CAT backhoe to the Mojave. Due to security concerns, the equipment is being stored at the FAR site in view of their security cameras. Larry and Keith agreed to look into options for cameras that could provide similar security at the MTA.
While the initial plan was to drag the concrete plinth from the current pit toilet to the new one, a decision was made to proceed with building a new wooden platform to mount the port-a-john instead. Of concern was the seemingly likely outcome of damage to the concrete plinth when trying to place it with the equipment available. Dimitri outlined his idea for the new structure and offered to sketch out a more formal design after reviewing at the MTA at the launch event.
DUES REMINDER AND FUNDRAISING BRAINSTORM
The RRS treasurer offered a reminder for members to pay their dues for 2021, which remain at $40 for full membership and $30 for student membership. As a reminder, the full membership dues will be increasing to $50 in 2022. For questions regarding dues payments, contact the RRS treasurer:
Most of the members on the call got involved in the brainstorming session on how to increase fundraising at the society to cover our insurance and other yearly costs. Xavier proposed putting on a holiday party for the society as a ticketed event, and offered to take charge of scoping out costs and possibilities for the 2021-2022 winter season (when in-person gatherings will hopefully be allowed again). Dimitri discussed the challenges and opportunities involved in listing the MTA site with the Kern County Film Commission as a shoot location. The possibility of holding an auction, either stand-alone or as a part of the yearly symposium was also proposed, and Dimitri offered to put together a draft form letter to submit to companies to solicit donations. Additional items would be donated by members or other involved entities.
2020 CONSTITUTIONAL COMMITTEE
A request was made for an update on the status of the 2020 Constitutional Committee, which has been drafting changes to the constitution of the Reaction Research Society. Committee member Frank described that only a few outstanding issues remain, including the definition of active membership, which need to be finalized by the Executive Council before being presented and voted on. The Executive Council intends to meet on this issue soon and present the new constitution to the voting membership in the coming months.