August 2022 monthly meeting

by Keith Yoerg, Secretary, Reaction Research Society


The RRS held its monthly meeting on Friday, August 12, 2022, by teleconference starting 7:30pm. The agenda was below.

  1. Review of recent MTA/rocket events, reports are posted on the website
    • 7/9 & 7/16: Work parties at MTA to install bathroom container (video Keith made of the delivery with the drone)
    • 7/21: Aerospace Ccorporation intern launch event
    • 7/25-7/31: Michigan liquid engine hot fire test campaign
  2. Upcoming MTA events
    • Bathroom work to continue in September
    • Other planned events are
      • USC RPL pad work
      • USC propellant sample testing
      • and a USC RPL static fire
      • Bill Claybaugh is preparing a new pad for launching heavier rockets from the MTA
      • Bill Ca;ybaugh will launch his six-inch rocket from a new rail launcher
  3. Social media milestone reached: 1,000 Instagram followers
  4. Preferences for future monthly meetings:
    • Monthly in-person (w/ zoom option) is something desired by many
    • In-person 4x per year (zoom other months), some supported the idea, other thought it may be confusing
    • Other ideas included meeting at a new location at the Compton Airport front office
  5. Other items addressed by the Executive Council this month:
    • Looking into society workshop/workspace at the Compton airport
    • Addition of more/semi-permanent high power launch pads
    • RRS membership has surpassed 2021 levels
    • Progress still being made on website update, hope to show something next month

Our next meeting will be September 9th. Contact the RRS secretary for details.

The Reaction Research Society reaches a milestone in our social media campaign.

MTA Firing Event, 2022-07-31

by Dave Nordling, President, Reaction Research Society


The University of Michigan came to the Mojave Test Area for another static fire campaign starting Monday, July 25th and ending July 31st. Pyrotechnic operators, Jim Gross, Osvaldo Tarditti and myself supported this protracted campaign in the July heat. The weather was challenging during that week with few heat-related problems other than slow progress which is understandable given the conditions. New RRS member, Rushd Julfiker, and long time member, Jim Gross, assisted me in the cold flow and hot-fire testing. MASA’s academic adviser, Professor Mirko Gamba was also present at the MTA for the days of cold flow and hot-fire testing.

University of Michigan held a Test Readiness Review on Sunday, 7/17/2022, with RRS members present. Many good questions were raised but few corrections were needed. MASA proceeded with packing and departed campus for the MTA on Friday, 7/22/2022.

University of Michigan first day at the Mojave Test Area

The team arrived at the MTA on Monday night (7/25/2022) and began to unpack their gear and assemble the mobile test trailer. Leak checking went more smoothly due to design improvements. Problems with the igniter channel would prove to be a recurring concern.

Initial setup of the mobile trailer at first arrival.
Attaching frequently used tools by retractable tethers means never hunting for the right wrench again. Genius.
Hewlett-Packard film crew prepares to have interviews with the students.
Control trailer operations leading up to test.
A clean injector ready to be installed.
Fuel transfer operations before next test.
230-liter cryogenic liquid cylinders from Linde.

On Friday (7/29/22), gas bottles and cryogenic liquids were recieved from the supplier. Delays in receiving these consumables allowed sufficient time to verify systems were ready. MASA achieved significant progress towards hotfire after completing four valve timing coldflows and one abort test. Analysis of the data from our tests in preparation for hotfire tomorrow.

The RP-D2 engine sits on its thrust stand.
University of Michigan’s mobile test trailer beside the vertical test stand

Saturday (7/30/22) was the first attempt at hot-fire which was unsuccessful due to an igniter failure. The cause was traced back to an intermittent problem with the switch in the junction box. The prior igniter test demonstrated the igniter would fire in the cold flow conditions the day before. Comparing data sets, the team found that a simple verification of continuity in the voltage data stream during the countdown would safely identify a failed igniter firing circuit and allow a safe abort if it were to repeat.

RRS members Jim Gross and Rushd Julfiker examine the setup before the next test attempt.

In the last hour of the last day (Sunday, 7/31/22) of the campaign, MASA completed a successful 1 second hot-fire of the 2,000 lbf RP-D2 engine. The chamber and injector remained intact and the system safed itself properly.

Screenshot from the 1-second firing of RP-D2 as seen from the Garboden bunker

After examining the data, pressures were significantly off from the expected profile, but the engine passed the visual inspection After further consideration, the team opted not to proceed with a longer 4-second burn due to the uncertainty about our data values and pressure drops seen from hot-fire. MASA would conduct a more thorough examination of the data and hardware back at the university.

The MASA team began cleaning up the test site on Sunday night and continued throughout the night to prepare for the 1800 mile jouney home. University of Michigan was extremely happy with the result of their campaign and were grateful to our pyro-op’s and membership that supported every day with the MASA team.

The RRS was glad to provide our testing site, resources, experience, labor and insight to this successful testing campaign.

For inquiries about using the RRS Mojave Test Area, contact the RRS president.

president@rrs.org


March 2022 virtual meeting

by Keith Yoerg, Secretary, Reaction Research Society


The society held its monthly meeting for March on Friday, the 11th, at 7:30pm by teleconference.

The following items were on the agenda.

  • Chris Lancaster’s presentation on rocket bikes and drag racing history
  • Review of recent MTA events, USC RPL static fire
  • Upcoming events at the MTA
    • Delivery of new 40-foot storage container by Dimitri Timohovich
    • Site maintenance and upgrades
    • Wolframe Blume’s next flight of the Gas Guzzler
    • Bill Inman’s testing for steam rocketry
    • Low power launches
  • Upcoming university event requests and inquiries
    • USC RPL static fire and flight
    • University of Michigan, MASA in May 2022
    • UC Irvine and Cal Poly Pomona
    • UCLA
  • Student classes and launches
    • LAPD CSP – STRIVE event, 4/2/2022
    • YMCA classes, launch on 5/1/2022(?)
  • RRS post office box, renewal and other options

We spent the majority of our time on the subject of early rocketry in drag racing and rocket bikes. Chris Lancaster of Pennsylvania spent an extraordinary amount of time researching this subject and the specific rocket bike built by Henk Vink now on exhibit in Germany. A stand-alone article on this topic may be forthcoming.

Henk Vink, racing a rocket-powered motorcycle in Europe

The MTA firing report from 3/12/2022 covers the events from that day following the meeting. The anticipated events were discussed at the meeting.

The RRS will continue to keep our post office box in Los Angeles (Inglewood) 90009 for another year. The annual cost has been rising but it remains well used for correspondence.

Reaction Research Society; P.O. Box 90933; Los Angeles, CA, 90009

Our director of research, Richard Garcia, agreed to investigate LNG safety guidelines with regard to flaring of this volatile fuel in amateur rocketry applications. He will submit his findings to the council for internal peer review. The RRS will be creating a policy on this issue as some amateur liquid rocket projects intend to use natural gas (largely methane).

example of an industrial-scale flare stack

Further updates to this meeting report are forthcoming.

Next meeting will be April 8th. For those interested in attending, contact the RRS secretary.