TL;DR I bought the Madcow kit to use my Eggtimer rocketry electronics and to test dual deployment. I suppose for simplification, the Madcow Torrent could be flown in non dual deployment mode with a J350. This simplification is claimed on the Apogee website.
There is a forcing function in my subconscious that I have to be careful of:
When I was a child, I built several Estes rockets: Alpha, Eliminator, NOVA Payloader, Mosquito, etc. I also participated in a rocketry activity in high school where we fiberglassed our own tubes, learned about center of pressure and center of mass, and operated some dawn of the millennium
version of rocket software. I also attended several meetings at the university where they were building an anodized aluminum rocket, but I quit going because I could not follow what was going on.
I went to Airfest 24, and it became obvious to me I had forgotten a lot about rocket construction. I built a Nike Smoke, which is in the Estes Pro-Series II . This taught me about inset fins, motor mount construction, and motor retainers. Since I flew with an Aerotech DMS H135W at a later time, I learned how to
properly prepare a motor with an added black powder ejection charge. This was not my first experience with a composite motor. I thank a guy at Airfest for giving me a Quest B6-4 (If I can recall correctly).
I built a Wildman Punisher Mini. I will need to do a bit of work before it is flight ready. Adding a motor retainer to the rear, and inserting my spent H135W motor gave me worries that the center or gravity was too close to the center of pressure. I may need to add weights to the nose cone
to shift the center of gravity forward away from the center of pressure. If I chose to use an H, OpenRocket suggests that I will exceed Mach. This velocity will also give me a great altitude assuming I have the proper delay and assuming I have enough momentum to overcome drag. This means that
I will have trouble finding this rocket if I do not add a tracking advice.
When working with a friend, we found it necessary to not attach the kevlar shock cord directly to the motor mount tube. Doing so would require cutting a slit in one of the motor mount rings, and it would have to go all the way through to fit.
This would break the annulus. With enough epoxy, this probably would not have been a big deal. Our solution was to attach the shock cord to a mounted ring with a carbon fiber section attached.
<img src='https://farm2.staticflickr.com/1919/44860651114_feb3b7521d_z.jpg' / width="200">
I am not sure how well this will sustain repeated flights. The exposed area is small, as is the exposure time.
The PML Tethys seems like a great kit. I like that I saw a link to the Kwik Switch instructions. I heard that rockets were sometimes built that allowed for different diameters of motors, now I have seen a method for accomplishing this. However, I do not see a big difference in the rocket from what I have done previously.
This gets to an underlying motive. I'm frustrated that I have applied to SpaceX, Boeing, Virgin, and I am continually turned away. I feel I need to shatter the belief that doing a Masters in Chemical Engineering with no engineering internship experience is somehow good enough.
I am seeing inroads with my above-average computer experience (Linux user, developer experience, meetup founder, et al.), but this really was for a passion project to build a community to build open source space hardware. I ultimately wanted to build hardware. My mistake with the software was to make it too complex with niche technolgy which led me to ultimately drift from the developer community and their technology.
This made me an overall weak developer, or at least one with knowledge gaps. I discovered this with my last position. Following events led me to question whether I really wanted to be a developer or whether I wanted to be an engineer. I assumed from experience, that each choice would require considerable time to perfect. I know I have spent seven years on my software project, and it took considerable time to get a Masters degree.
I remember talking to an employee at SpaceX who gratuitously gave of their time. They told me a good way in was to build something. I did, and it turned out to be a number of potato cannons (if I have the timeline correct). I had heard about them when I was younger, and it sounded fun. As I did some of my work at a hackerspace, this led to a joke, "why don't you send a potato to the moon?". It turns out there was an Aerospace Engineer that some in the group had seen at Defcon. They suggested I talk to him. This led me to a team called AlphaCubesat, which was participating in the NASA Cubequest challenge to send a cubesat on the SLS. This exposed me to Systems Engineering, Radiation hardened electronics, the Deep Space Network, Hoffman transfer orbits, and weirdly an opportunity to talk about my software project at Hacker Dojo in Mountain View.
During the same year, I had the opportunity to volunteer for development for the Integrated Space Plan website. I chose this path, and abondoned involvement in AlphaCubesat. I liked that they were using a linked data and semantic web approach to represent information about companies and projects in a temporal fashion. I learned a lot about the new space industry then, as well as the National Space Society / ISDC, and SEDS.
I had the opportunity to return to ISDC when it was in St. Louis, and when it was in Los Angeles. After I missed the event in Los Angeles, I recalled that there truly were some amazing people there, both as speakers and volunteers. I discovered there was a list of speakers available. This led me to start contacting them. However, my activities through the passing months led one to observe that I was a bit scattered, and really needed to build something. My software project was not that persuasive, and would require deeper embedding (perhaps within an organization) for success.
While I was reaching out to people I remembered from AlphaCubesat and the Integrated Space Plan adventure, I discovered that the rockets that were being used to launch smallsats were not all that different from high powered rockets (at least in size). Thus, I thought it would be appropriate to begin exploring high powered rockets for something to build.
I have observed the student competitions and found that they range from launching an egg undamaged to a particular altitude to space piercing liquid fuled behemouths. I am not a student, but I would like to emulate some of the projects. Since my degree is in Chemical Engineering I feel that I would be particularly suited for a propulsion engineering job description.
However, I do not have the experience that I would have obtained had I participated in a student rocket competition. Therefore, I am imagining a Level 2 certification, then solid research motors, then hybrid rockets, and then liquid fueled rockets at the FAR site. At some point, I hope one of the companies I am applying for likes me. This will be expensive, so I am trying to learn the most I can at each iteration of building.
Saturday, October 27, 2018
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