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3D PRINTED HIGH POWER ROCKETRY Build Part 1 T OTAL I MPULSE V OLUME 2 1 , N O . 2 March - April 2021 Der Big Red Max 3D PRINTED HIGH POWER ROCKETRY Build Part 1 Inside This Issue: Article: Page 3D Printed High Power Rocketry 3 Club News 7 View From The Flight Line 8 Nike Cajun Photos 10 Nike Apache Photos 12 Current Events in Space Exploration 14 60 Years Ago: Vostok 1 18 This Month in Aerospace History 19 In Memorium: Michael Collins 24 Launch Windows 25 Vintage Ad 26 60 Years Ago: Vostok 1 In Memoriam: Michael Collins T OTAL I MPULSE V OLUME 2 1 , N O . 2 P a g e 2 CLUB OFFICERS President: Scott Miller Vice President: Roger Sadowsky Treasurer: Tony Haga Secretary: Bob Dickinson Editor / NAR Advisor: Buzz Nau Communications: Dan Harrison Board of Director: Dale Hodgson Board of Director: Mark Chrumka Board of Director: Dave Glover It is currently the first week of May and I What to do when life gets in the way of MEMBERSHIP just watched SpaceX successfully launch your plans? To become a member of the Jackson Model Rocketry Club and Huron Valley Rocket Society Starship SN-15 through the clouds to means becoming a part of our family. We have 10km, pitch over for a high drag, unpow- I guess the next best thing to being out on monthly launches and participate in many edu- ered descent, come back through the the range flying is to prepare and invent to cational events. We encourage our members to clouds, pitch back upright and nail the avoid excessive lost time when we can get actively participate in our club projects, running landing. We live in amazing times. Mean- back out there. I personally have wandered for office in our annual elections, contributing to while, we’re struggling to get to a point in many directions to help me mentally as our monthly newsletter with articles or tips, and where we can resume rocket launches of well as provide progress for the club. My offering services to the club in their area of ex- any kind. Again, we live in amazing times two main topics have been refining python pertise. We have many members comprised of children, men, women, professionals, lay people, and it’s not always amazingly good. coding and a lot of 3d printing. Python has educators and people from many other walks of proven to be extremely universal and also life. Though we are making positive strides in has dialect for microprocessors which You may fill out an application at a launch or resuming launches, it is going unbearably could be interesting for flight computers, request an application from one of our board slow. When we are able to resume, we’ll launch components, etc. members at [email protected] and mail be ready to go. Also, it will be great to write it along with a check for the annual membership launch reports again. Hopefully in the next The 3d printing has taken many turns as dues ($30.00 individual or $40.00 family) to our issue. well. New avionics bays, nose cones, and mailing address: basically any part that can appear in cad. JMRC/HUVARS With Scott’s 3D printed rocket article, I am The hybrid motor game has lots of room to C/O Bob Dickinson hoping that this content becomes a regular experiment with new grain geometries or 5668 Big Fish Rd topic in the newsletter. Several members even a weeping grain to introduce new Goodrich, MI 48438 are active in the area and have produced fuels during a burn. I hope everyone else amazing parts, tools, and rockets. has found a means to cope, and if things Members enjoy participating in club projects, continue on the positive path we can all be meeting an incredible group of positive people, Thanks to Scott Miller, Dale Hodgson, back out on the field to formally test all of and no launch fees! Chris Timm, Peter Alway, and Tony Haga our builds and experiments that have been COMM CHANNELS for contributing content to this issue. piling up. There are several ways to keep in touch with the About Total Impulse JMRC/HUVARS and it’s members. See you on the field soon! Scott Total Impulse is the official newsletter of the Website: http://www.jmrconline.org. Information Jackson Model Rocket Club (JMRC), Tripoli includes directions to launch sites & schedule, Prefecture 96, NAR Section 620. Published Bi- range procedures, and instructions on how to Monthly, Total Impulse is a space-modeling join the club. newsletter devoted to representing the diversity of interests in today’s hobby of model rocketry. Groups.io: The JMRC groups.io site is a place This newsletter is in the public domain except to share files and also serves as our primary e- where otherwise marked. Unmarked articles, mail list serv. Follow this link to join, photographs, and drawings may be re-printed https://groups.io/g/jmrc elsewhere, but credit to the author and this newsletter is expected. Material marked as copy- Facebook: If you have a FaceBook account righted may not be re-printed without the con- search for “Jackson Model Rocket Club JMRC” sent of the author. and request to be added. The editor of Total Impulse accepts material for inclusion from anyone. GroupMe: Our new chat channel for broadcast- Send correspondence to: ing notifications instantly using a free download Jackson Model Rocket Club client for IOS and Droid as well as by SMS text Buzz Nau, Editor messaging. You can join the notification chat E-mail: [email protected] after creating a free account and following this link, Launch/Event Calendar - 2021 https://groupme.com/join_group/28013422/zc5IC1 • May 8 Pending (MIS) • June 12 Pending (MIS) • July 10 Pending (MIS) Fade To Black Rocket Works • NARAM 62 - July 23 - 30 (Geneseo, NY) Heavy Duty Launch Pads For Every Need • August 14 Pending (MIS) All pads are powder coated for lasting durability • September 11 Pending (MIS) • October 9 Pending (MIS) https://www.facebook.com/fziegler13/ • November 13 Pending (MIS) On the Cover: Concept Mini $119 Concept X-treme $325 NOTE: Launch dates are subject to change without notice. (top - left) The new Estes Der Big Red Max - Estes LLC Concept $285 Ground Pounder $345 photo (top - right) Addy Miller holds Dad’s 4” dia 3D Be sure to call the “launch hotline” at 517.262.0510 for the printed high power rocket (bottom - left) Cosmonaut TARC Pad $285 Ground Pounder Heavy $425 latest weather and field information or sign up for the JMRC Yuri Gagarin (bottom - right) Astronaut Michael Collins +Shipping Notification GroupMe chat. T OTAL I MPULSE V OLUME 2 1 , N O . 2 P a g e 3 Scott Miller I have always wondered could there be another way? This has The fin pattern is my go-to trapezoidal style that is 10mm thick. I been a universal question that is always finding its way into vari- needed it bulky to accept a screw for mounting but made them ous topics and now it comes into high power rocketry yet again. hollow with hexagon infill structure. 3d printing model rockets have been increasingly more common for a while now but why has it seemed to stall with model size and miscellaneous parts? With this in mind I challenged myself to design a rocket that is 3d printed, uses zero adhesive, and can fly safely on a high-power motor. Step 1 finding a material that can hold up to the temperatures of a HPR motor. After a lot of mental debate and research I decided on Polycarbonate. The brand I chose prints at 270C and doesn't start to soften until 220C. This would appear to fall into the safe range of the certified motor limitation of 200C limit. Since we are designing from scratch might as well build in a threaded retainer at the same time. The rest of the rocket can benefit from various materials, with prototype mentality I just went with material I was familiar with and is relatively durable so PetG became the winner. The next phase is the fin can design, the goal is a Big Dumb Rocket (BDR), thus I went for bulk and strength… no altitude or speed records in the future :-). The centering rings have ribs for fin alignment and tapped holes to 8-32 thread to firmly affix. T OTAL I MPULSE V OLUME 2 1 , N O . 2 P a g e 4 Scott Miller The fins bolt right in place with 8-32 machine threads. I'm assem- bling this with 1" length screws but the fin is tapped all the way through for the Dale Hodgson’s of the world that need to over- build… not to call anyone out of course ;-) Fin can complete, next step is some skin for the bones. This por- tion underwent a lot of iterations and some complete redesigns. My largest printer is only capable of 210mm build volume, so this adds a bit of a challenge unless you want a very short and stubby rocket. The current version went with threaded body tubes with a joining ring so the end user can adjust the length as desired. The motor mount assembly slides in and has a threaded locking disk to hold everything in place. Above is a slotted airframe and a full airframe with a joining ring. T OTAL I MPULSE V OLUME 2 1 , N O . 2 P a g e 5 Scott Miller The fin can airframe slides in place and bolts directly into the cen- tering rings with more 8-32 machine threads.
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