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Derek Honkawa
Registrace 1. 07. 2013
I build liquid rockets, but whenever there is a liquid rocket out at the Friends of Amateur Rocketry, chances are I'll be there helping, filming, getting in the way, or generally hovering.
Half Cat Launches Too Many Rockets
I recommend setting the video to 4K on a 1080p monitor
January to May 2024
It's been a while since I've been able to upload a video, but that hasn't stopped Half Cat Rocketry from testing their new Mojave Sphinx. The Mojave Sphinx is result of years of steady testing to create a simple and robust Nitrous-Anything rocket. Alongside it's consistent performance and high reliability record, this has also been the best documented Half Cat Rocket to date, and has already set the standard for entry level bipropellant rocketry.
January to May 2024
It's been a while since I've been able to upload a video, but that hasn't stopped Half Cat Rocketry from testing their new Mojave Sphinx. The Mojave Sphinx is result of years of steady testing to create a simple and robust Nitrous-Anything rocket. Alongside it's consistent performance and high reliability record, this has also been the best documented Half Cat Rocket to date, and has already set the standard for entry level bipropellant rocketry.
zhlédnutí: 2 885
Video
Kip Daugirdas flies Mesos at FAR, the sequel.
zhlédnutí 1,3KPřed 8 měsíci
November 4, 2023 Finally getting through the video backlog of 2023. Things are extremely busy behind the scenes at FAR, with new construction and the second annual Academic Industry Liquid Rocket Symposium happening on January 27. This day, Kip Daugirdas returned with Mesos for a revenge flight, following a previous attempt in May. With Kip's high performance rockets, and higher waivers and imp...
A Closer Look at Half Cat Rocketry's Mojave Sphinx
zhlédnutí 1,2KPřed 9 měsíci
November 4, 2023 It can be difficult to see much happening at the bottom of a Half Cat nitrous alcohol rocket in flight. The clear burning combustion is essentially invisible, so all you hear is the buzz of the motor and the dust kick up off the ground. After having skipped the static fire process for 1CAT/4 and most of the Mojave Sphinx, the Half Cat team are going back to collect some importa...
Students Build and Fire a TVC Liquid Rocket to win $15K (SEB)
zhlédnutí 1,5KPřed 10 měsíci
October 7, 2023 Space Enterprise at Berkeley, who have been covered extensively by this channel over the few years of their meteoric rise to prominence in collegiate liquid rocketry, have achieved the milestone of vectoring or gimballing a liquid rocket motor. And not just some boilerplate either, but a flight weight full duration 15 second static fire. This means that they have set the world r...
New Motor, New Attempt at Recovery and Broadcast Testing (Space Enterprise at Berkeley)
zhlédnutí 591Před 10 měsíci
October 7, 2023 Three weeks ago, the Berkeley team attempted to flight test their recovery system for their liquid bipropellant rocket. While matching the profile and materials of the liquid rocket as best as they can, which includes strong MJF 3D printed components and fiberglass, they use a simpler Aerotech commercial motor as their motive force. In their first attempt, the nozzle blew out, a...
Testing Recovery Systems for a Liquid Rocket (With a satisfying conclusion)
zhlédnutí 1,2KPřed 11 měsíci
September 16, 2023 Space Enterprise at Berkeley is starting to pick up speed again with the new semester. They have a long list of objectives to accomplish. While one part of the team focuses on testing the vertical stacked liquid bipropellant rocket, another part focuses on testing the recovery system on a subscale vehicle. With a commercial off-the-shelf motor, it's almost certain to achieve ...
First Person View of Operating a Liquid Rocket Engine
zhlédnutí 685Před 11 měsíci
September 9, 2023 You have to make tradeoffs when performing a liquid rocket static test. The last time we tested this motor, I had my cameras rolling, but we forgot to start recording the data acquisition (DAQ) which would record our test data. This time, in order to make sure the DAQ was recording, I had to forget to start most of my cameras. This time, however, I had a camera on my helmet to...
Filming a Rocket Motor Through a Sugary Snowstorm (Paul Snow)
zhlédnutí 913Před 11 měsíci
September 9, 2023 Filming Sugar Rockets is a risky and often unfruitful business. These motors love to eject enormous clouds of matter, assuming they don't explode from one of many failure modes common to sugar propellant. Normally I wouldn't risk putting my cameras so close to one, especially not my latest and most expensive 4K camera. I made an exception for Paul Snow's latest motor though, a...
Parachute at Take Off (Oregon State University)
zhlédnutí 965Před rokem
August 19, 2023 With a tropical storm looming over the horizon, Oregon State University pushed forward with their launch plans, and found the weather cool and inviting out in the Mojave Desert, with relatively clear skies and calm winds. In 12 hours, the entire desert would become inundated with uncharacteristically high rainfall which would see the roads close and the dry lakes fill with water...
Looking at faraway rockets in full 4K, from above and below
zhlédnutí 442Před rokem
August 5, 2023 A short and simple video, as activity has quieted down briefly with the new academic year looming. With a 4K drone, 4K camcorder, 4K gopros, and now a newer high speed 4K gopro, I have all the tools I need to capture any angle in as high a quality as I want to (including from in front of the nozzle, but that's only on rare occasions). For the 1080 viewer, this translates to bette...
The Mighty LOX Hybrid Rocket of Bavaria
zhlédnutí 2,6KPřed rokem
July 15, 2023 Unlike other rockets from the continental US, international rocket groups need to contend with customs and shipping. The same process applied to the EX-3, the LOX-HTPB hybrid rocket developed by WARR, from the Technical University of Munich in Germany. EX-3 exists on the upper end of the "Q" motor impulse classification, with more than 3 times the energy of the typical bipropellan...
Powerful High Performance Rocket Explosion and Impact (Aerobing)
zhlédnutí 2,1KPřed rokem
July 16, 2023 With high performance solid rocket motors, the likelihood of catastrophic failure increases as the pressures and stresses edge closer to their ultimate limits. The high heat of the desert summer makes these margins ever lower as both propellant and resins soften, and focus wanes. With appropriate safety installations like FAR bunkers, a motor cato may be best placed just after it ...
The Evolution of Nitrous Liquid Rockets (UCF)
zhlédnutí 2,7KPřed rokem
July 15, 2023 Nitrous Bipropellant rockets have made a resurgence in recent years, thanks in no small part to Half Cat Rocketry. This small two-person operation started out at the University of Central Florida, and after graduating, they have continued their work with autogenous nitrous systems in California. Back at their alma mater, the Knights Experimental Rocketry group have collaborated wi...
Georgia Tech Tests Ever More Powerful Motors with Ambitions of Space Flight (GTXR)
zhlédnutí 696Před rokem
July 9, 2023 Every year, Georgia Tech Experimental Rocketry, a division of the campus's Ramblin' Rocket Club, designs and builds a two stage rocket as part of a spaceshot campaign. This year, the team brought out two "P" class experimental rocket motors to try to fly to 220,000ft. This provides no shortage of power for their latest rocket "Material Girl", and any successes in the flight would b...
A Powerful Yorkshire Rocket in a California Desert (Project Sunride)
zhlédnutí 868Před rokem
July 1, 2023 Having first flown across the world from the north of England, the two stage "Karman Alpha" prepared to launch at FAR to an estimated 100,000ft. The rocket was built and operated by Project Sunride, an emerging team from the University of Sheffield that recently claimed the UK amateur altitude record. Karman Alpha is equipped with two commercial N5800 motors, one for each stage, an...
A FAR liquid rocket launches within a minute of a UCLA liquid rocket
zhlédnutí 813Před rokem
A FAR liquid rocket launches within a minute of a UCLA liquid rocket
Full Cat at Full Power. Successful Nitrous Bipropellant Static Test (Half Cat Rocketry)
zhlédnutí 581Před rokem
Full Cat at Full Power. Successful Nitrous Bipropellant Static Test (Half Cat Rocketry)
UCLA Hybrid Rocket with Steel Case Burnthrough
zhlédnutí 698Před rokem
UCLA Hybrid Rocket with Steel Case Burnthrough
The Fiery Debut of the Full Cat Rocket (Half Cat Rocketry)
zhlédnutí 713Před rokem
The Fiery Debut of the Full Cat Rocket (Half Cat Rocketry)
LOX-Propane Rocket Burns Well, Despite Also Being On Fire (Space Enterprise at Berkeley)
zhlédnutí 905Před rokem
LOX-Propane Rocket Burns Well, Despite Also Being On Fire (Space Enterprise at Berkeley)
USC LPL Fires a Gimballed KeroLOX Regen Rocket Engine*
zhlédnutí 666Před rokem
USC LPL Fires a Gimballed KeroLOX Regen Rocket Engine*
ERAU-Prescott flies liquid rocket to 47,000ft*
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ERAU-Prescott flies liquid rocket to 47,000ft*
Berkeley STAR's Liquid Bipropellant Rocket Motor
zhlédnutí 1,3KPřed rokem
Berkeley STAR's Liquid Bipropellant Rocket Motor
3CAT/8 Takes Flight (Half Cat Rocketry)
zhlédnutí 497Před rokem
3CAT/8 Takes Flight (Half Cat Rocketry)
New Altitude Record by a Student-built Liquid Rocket* (UCLA Rocket Project)
zhlédnutí 2,5KPřed rokem
New Altitude Record by a Student-built Liquid Rocket* (UCLA Rocket Project)
Midair CATO of an experimental APCP motor (Aerobing)
zhlédnutí 1,1KPřed rokem
Midair CATO of an experimental APCP motor (Aerobing)
MethaLOX Regenerative Rocket Engine Hardstart (SDSU Rocket Project)
zhlédnutí 2KPřed rokem
MethaLOX Regenerative Rocket Engine Hardstart (SDSU Rocket Project)
Any plans to try a vertical landing rocket?
How do you calculate the liner's THICKNESS? Can you give some theory's pdf link?
สารคดีจักรวาลล่าสุดวันนี้ต่างประเทศ 0:44
That orange cloud of NO2 at 2:03 is terrifying
Very cool, but the video doesn’t show most of the rocket boosting nor recovery, which rocket launch vids normally show. Did it go horizontal? The fins looked too small to me, but propulsion worked fantastically!
Are you using gaseous oxygen..? Because i dont see frozen ice outside the tanks..
That rocket just f*cks off
I'm always a stickler on combustion stability, and that beast did not disappoint 1/128th of one single bit. That plume was rock solid stable. Not an easy task with kerosene. What grade did you use? Now I want to see some crazy person to launch a solid fueled- rocket with a double or triple base propellant, or a composite-modified double base.
What might they do with the boric acid?
How much km Distance traveled max????
Camera persons sucks !
I wish I was doing liquid rockets 😭 awesome work.
The cat has cleared the bag
The beer keg rocket man himself
Same engine, different propellants? Boric acid oxidizer, WD40 fuel? More details on EACH of these very interesting video cuts, PLEASE.
From the description, its a nitrous-anything rocket. Boric acid and WD40 are both used as fuel, but on different flights.
Oxidizer is always nitrous oxide, but the fuel can be any flammable liquid. We typically use E85 or E98, often with an additive like boric acid or calcium chloride, but sometimes use hydrocarbons like diesel or WD40 for fun.
Small scale liquid fueled rockets 😩😩😩
Fantastic work you’re doing!
No such thing.
Good work
Imagine starting a wild fire
wow! nice torch !
Merica set a record of 230,000 feet with a go pro camera in outer space. You planning to do that?
By managing how two elements fire , not quite 'out of phase' (ANTIPHASING), it's my hope I'll be able to 'self attenuate (within the engine) this cumbersome acoustic energy by re-transforming that energy back into raising the thermal potential of the working fluid (air). The goal of harnessing detonation technology is to reap the thermodynamic cornucopia realized from attaining extremely high temperatures within microsecond domains. What is revealing, is that detonation technology allows us the opportunity to transform high temperature fuel/air mass flows into a :time management problem. In this context, the higher the mass flow temperature at any given point within the engine is determined by the confining medium (metallurgy). What all this means, is, that a constant volume detonation has a constant yield., therefore, by managing the frequency of operation we have a very fine means of modulating power output. My goal is to validate the doubling cubing relationship of: 'as the frequency of operation doubles... the power out is cubed' This is understandable because the engine is operating at constant volume in each detonation and it's power output is determined by the number of detonations within any given time domain. As mentioned in earlier posts on this page, the acoustic output of these machines has prevented me from doing much research up until a few months ago. I'll be recreating an experiment I performed at Bracket Field in April of 93' which got me evicted. I was sharing the hanger with the local police department and I was goaded into firing it amongst unsuspecting off-duty cops. I only ran it at 300 pulses/sec ,however, it sounded like the'warthog' gattling gun. Well. after all these guys dressed up in nice civies got up off the tarmac my friend was told " get that muthafucker out of here tonight!" Most single mode operation can get up to 140db in the kilohertz range.
Very Cool!
Ла иакое быват , у меня давигетель на 4 килограма так ьахнул что куски топлива на 50 метров летели .😁👍👍👍
How do you bond the carbon fiber overwrap to the aluminum flange?
Get back in the bunker?! Safety is #3.
Derek, was the sustainer recovered? Thanks for sharing.
Everything came back fine. It didn't reach space though, but it's getting closer. He's at the top of the FAR leaderboard for recovered rockets
Insane seeing it arrowing its way up to these crazy altitudes, amazing work guys
wew, that was *quite* the flame for a hybrid, very impressive.
Lol that Joe Barnard clip, it's always Joe, it seems like.
That’s wild! What’s the fuel it’s almost like acetylene!
I didn't realise that sugar rocket fuel could be so potent. I mean it only has a ISP of 110seconds to 130seconds maximum (thats with KNO3 as an oxidiser, not sure what this motor uses)
We usually run around 125 with KNSB. The highest I've gotten was 134 but at 1200 psi. Anything can seem 'potent' when you over pressurize the containment.
Very neat! How does it work exactly? The link doesn't seem to work for me
I redesigned the website, so a lot of old pages were deleted. It uses sleeve lock quick disconnects. An outer sleeve disengages and ejects the socket.
Pretty rocket…
Gas griddle for the next time I'm down at FAR or the desert. Yeah.
Очень красочно, спасибо!
11/10
This system actually used our electronic regulators, which use ball valves. The diaphragm sound was the check valves we use to stop propellants entering our pressurant tank and the check valve we use for pressurant fill.
That makes sense. There's usually one thing I get wrong.
This is ultra awesome! A student-built LOX/Propane engine. Also that thin walled-chamber took the hole like a boss and kept going, wow. And pulling this off within a day is crazy good. You guys rock \m/ Mind one thing though, please (Although I think you fixed that already in the second test): Stay calm and focused throughout the hotfire sequence and afterwards until you bring the system into a safe state, so you are ready and prepared if shit goes sideways (For sure it's hard because of the pure awesomeness of the test :D) Cheers and congratz!
beautifulllll :3 well done
great success!
Hell yea, we finally recovered!!!!!!!!! Now we just gotta keep doing exactly that, but from 10x the altitude.
Which propellant did y’all use?
What resources used to design this grid fins there is any ratio between the size of the rocket and the grid fins? Great video BTW.
If I recall, it was an approximation made by comparing to ordinary fin surface areas, but this does not factor in occlusion.
What is. That. Like.fuel is. Licking. From. Side. While. Flight😮
Something I've been advocating for to liquid teams I work with, during development of your liquid or hybrid motor, the recovery team needs to build out the actual top part of the rocket that will be used for the recovery and flight test it on an inexpensive solid motor...the full scale real deal. czcams.com/video/jWspWbTCXbM/video.html Launching a subscale or ground testing is better than no testing but during the project motor development there is plenty of time for the recovery team (responsible for 50% of the flight) to build out and flight test the actual avionics, nosecone, and chutes to be used. Similar to what NASA did for Apollo with Little Joe II . This UCLA team came to me about launching the liquid bi-prop the next month and at my suggestion, built this lower section and fins that we flew 10 days later on the solid motor. Their later liquid launch was successful with perfect recovery and have the altitude record for the FAR Dollar per Foot Challenge.
Damn, sorry about that. Any chance on a refund from Aerotech? Was the casing okay?
It looked like it just blew out the nozzle. The grain was extinguished quickly, and the Berkeley Team made sure to prepare for a proper RMA with Aerotech as soon as it happened, rather than monkey around with the grain too much. Case is safe.
Does that qualify as a propulsive landing?
Frankie squared
Just occurred to me on rewatch that the instability is probably constant frequency, and it pitches lower in the video because of the Doppler effect. Would be interesting to plot the frequency vs. time and see if it matches the trajectory.