by Joel Cool-Panama, Secretary, Reaction Research Society
On Friday, 3/29/2024, Dimitri Timohovich was able to pick up and deliver the hydraulic equipment for the 60 foot launch rail. Rushd Julfiker was able to come out and help him off load the equipment. They then went up to the Butterfield’s home in Ridgecrest and picked up the shop equipment donated to the RRS. They off-loaded that gear into the Dosa building and called it a night.
Early Saturday morning saw a fair amount of rain in the desert and the nice smooth road we used to get in and out of the MTA is once again a sloppy mess. Even though it was slippery, all that planned to be at the MTA made it there.
With help from Dave Nordling, his friend Matt Giovannucci and Bill Nelson; Dimitri was able to put the shop equipment away into the Rockwell trailer and container 11. The hydraulic equipment is sitting in front of container 14.
The RRS would like to thank the Butterfield family for their generous donation of the shop gear. These items will greatly help the RRS in its future endeavors.
RRS member Wolfram Blume continues to make progress on his gasoline-fueled ramjet system but opted to postpone his work at the MTA to avoid the inclement weather on Saturday. He may have been the wiser man that day. The weather was very challenging on the drive into the MTA. Greater rainfall than expected throughout the morning made the western road very difficult but many made the journey.
Dave Nordling served as pyro-op on that launch day bringing his friend, Matt Giovannucci, on what was a less than stellar day. Cold temperatures and light rain persisted through the morning, but winds remained light and even stopped with the sun coming out that afternoon. The road drained sufficiently to make the return drive easier but it was a mess.
New RRS members, Jeff and Chase Lang came to MTA and fired a series of six custom built H-sized solid motors. Member Jason Kobel joined them. All seemed to perform as expected with a single ignition problem rectified by replacing the igniter and refiring that motor. They had a model rocket they flew a few times from our 1010 rail on G-motors. After fixing a GPS tracker problem, they were able to retrieve their rocket downrange each flight.
Bill Nelson and Dave Nordling conducted fit checks of the first 1936 GALCIT rocket engine and its thrust stand replicated from the photos and scant information from JPL archives. This was an important milestone for the LACMA funded project with American Artist.
Larger sandbags were brought to the MTA. The Rice Hydro hydraulic hand pump owned by the society seems to have an internal seal or a check valve problem which prevented proof pressure testing of the methanol run tanks that day. More work on the fuel and oxidizer feed and control system will take place next month. The analog thrust measurement system consisting of a stylus and scrolling paper roll is still under design. Dimitri may have a suitable variable speed motor for driving it. We are holding schedule for a June event with the film crew.
A toilet auger and rotary snake has been put in the workspace in the toilet container which will help fix major clogging problems on the spot. Everyone has thus far been careful but it is better to have the means to unjam the plumbing on site and not need it than the alternative.
RRS President, Frank Miuccio, found a small roll-top desk for the Office Container 14, but will bring it to the MTA later.
Next month’s meeting will be at the gymnasium of the Mary Star High School in San Pedro on Friday, April 12th, which is the day before the 2024 RRS Symposium held at the same location.
The RRS held our last launch event of 2022 on Saturday, December 17th. Wolfram Blume brought out the next build of the Gas Guzzler two-stage rocket. I was the pyro-op in charge and RRS member Joe Dominguez was my apprentice.
It was a flight test of Wolfram’s third rebuild of this complex system. The ramjet upper stage was empty for this flight test to demonstrate the rebuilt design would work well enough before proceeding with a fueled flight test of the ramjet.
Wolfram explains the stages and the integration The Gas Guzzler is loaded and ready for flight.
The integration of the stages and mounting on the 1515 launch rail worked perfectly. The booster with an L-motor powered the vehicle on a stable trajectory under nearly zero wind conditions. Stage separation was clean and the drogue chute was seen deployed.
Booster stuck in the sand with the front end crushed.
The booster recovery failed to deploy and the main chute on the ramjet also failed. Both stages were lost but recovered less than 100 yards from the launch rail. The drogue chute was ripped clean and found downrange.
Wolfram has spare parts already made, but another launch may require at least another month before a new vehicle is ready. He must also study the wreckage and flight data to find the problems and how best to correct them.
Old anchors extracted by primitive but effective meansPatched holes finished.
The event was also used to fix the new horizontal mounting points. Four of the new 3/4-10 female anchors in the regular 7-by-4 pattern put in by USC RPL this year had problems. Two holes were blocked by old anchors so we spent the afternoon chipping them out. With a quart-sized plastic bucket and some small bits of gravel, the holes were patched with fresh concrete and left to cure until the next event in a month or so. The other two holes will be worked at the next event.
The event also continued the work on the restroom facility. The plumbing, pumps and electrical systems need work. The project will continue into January until its completion.
With the last hour of daylight, we started the stick welding of the missing mounting plate. Joe used the portable welding generator to get the plate in place, but multiple passes would be required to finish. We ran out of daylight before completing the job.
By Dave Nordling, President, Reaction Research Society
The RRS held a launch event on Saturday, June 4, 2022, at our Mojave Test Area (MTA). I was the pyro-op in charge. Winds were brisk and steady, but still under the 25 MPH limit. We had two operations that day.
The first was the UCLA Senior Capstone project led by Professor Brett Lopez. This quarterly class has seniors build and balance their own rockets from scratch. They load F-sized motors and fly them at the end of the quarter to prove their team’s skills in flight.
The UCLA students gather their materials in the propellant loading area.
Secondly, RRS member Wolfram Blume returned to the MTA with the latest rebuild of the Gas Guzzler. He had concerns about flying in the strong winds that day so he limited his work to testing the staging system with both halves on the 1515 rail. Bill Inman and new member, Dale, offered their assistamce in positioning the rocket on the rail.
Dale, Wolfram and Bill Inman
Bill Inman and Dale assisted Wolfram in trying out the new staging system in the Gas Guzzler. The old system (e.g., last December) was a hassle and required assembling the upper stage (main body tube, cowling, nose cone) on the rail with a screw driver and a step ladder. The mating of the booster thrust rods into the upper stage was very difficult. So after December, he redesigned and rebuilt the thrust rods and the staging system. The result was a successful design. The new system is fairly easy to stage on the rail, does not require any assembly (with the ever-present danger of losing small screws) and does not require a ladder. Wolfram feels good about this system for future launches.
The Gas Guzzler during its fit check on 6/4/2022
Wolfram doesn’t think he’ll make it back to the MTA until the summer heat is over. His goals for the summer both involve the fuel system:
The flameholder is the ramjet needs to ignite every time.
The ramjet slows down very quickly after stage separation (25m/sec/sec = 60mph/sec), so the ramjet must ignite within less than 2 seconds after stage separation; less than 1 second would be better.
Using the 270-volt, 3-phase electricity at Wolfram’s laboratory, he can run a 20hp air blower which can mimic the air flow at stage separation with a K-motor in the booster (175 m/sec). The blower can be run higher to mimic stage-separation flight speeds of about 250 m/sec which is just below the separation speed of an L-motor in the booster (280-300 m/sec).
Wolfram’s workshop is good for the tuning and testing the flameholder. but running the main burner would require returning to the MTA. The main fuel flow could be tuned using water. After the summer’s heat is over, he will return to the MTA and finish testing the parachute system. The first powered flight of the ramjet with a short – 5 second burn is under discussion.
This short event was also a good time to clean up the site a bit. The society has big plans for the summer including some much anticipated facility upgrades.
The next monthly meeting will be June 10th (2nd Friday of each month) by teleconference. Contact the RRS secretary for details.
