Recently I built a half-scale Nike Smoke for my Level 3 project. So the Nike booster will be the first half of this project. Remove nosecone, insert Apache. Good to go
Build thread starts here:
Flight Pics and video (my flight is at 2:30 into the video) starts here:
Flight report and results start here:
Back in March 2013 I started building a 1:6 scale Nike Apache. This was really the seminal event for this journey. The idea was to build a smaller version of my final project.
Build thread here:
So, here is the Nike Apache (from “Rockets of the World” by Peter Always. Such a good book )
Not sure how long this will take to build, but we should have some fun along the way!
As part of this build I want to introduce some new materials and processes, if it makes sense to do so. I am not just going to keep churning out same-old same-old. No point in that at all.
As part of this journey I am making a foray into 3D printing. I can really see this being a fantastic process for both rockets and my work (designing electronics for spectrometers), so I need to get involved with it to a decent level to get best value from the new method. As part of that I need to learn SolidWorks CAD package, and although I am on the bottom end of the learning curve (and probably driving it like a Neanderthal) I think you’ll agree that my first CAD attempt on a 3D package isn’t too shabby. This is actually my first drawing from the package! I think it’s ok anyway, and that’s all that matters!
- InsidesVisible.png (236.37 KiB) Viewed 5059 times
This has been faithfully reproduced in ABSplus (material specs here: http://usglobalimages.stratasys.com/Mai ... 5891747060 ). I have used 4MPa as my design limit to keep the stresses to an acceptable level. Overall the design is quite conservative, so the 8MPa spec for the material has a safety factor well above two in this design. A little bit heavy, but should be robust without needing to go on a diet. The 3D printing enables any features to be added, almost effortlessly, to make exactly what is required form the part, without adding extra mass or having to machine it away (or not, if it is too difficult) later. A little consideration is needed to ensure all areas are open and any support material that needs to be dissolved can be washed out. Washout was a little slow (two days) due to the long passages between the ribs, particularly around the bosses. No big deal…
Only minor sanding (just to remove the ridges from the layering process) was needed to get a snug fit on the FG airframe tubing.
It was an interesting exercise designing the 3D part. Instead of doing a basic structure and adding (fabricating) the other details later, the design is thought about entirely up front. Features are free: you just have to design them in appropriately. Need a taper or a radius? No problem. How about a boss or two between some ribs? Easy.
I have something special planned for the fins. That will be in the next chapter of this story. Until then, au revoir