I recently printed a 4 to 3 inch transition for a rocket build in progress. Currently, I'm working on a "through the wall" camera shroud for the mobius so that only the lens passes through the booster tube wall.
Fred, L2
ICBM, Camden, S.C.
KG4YGP
Hey Fred, did you come up with an idea for your Mobius? Here is a design I'm working on. Requires taking the Mobius out of it's case.
View attachment 373702
Some fairing designs.
and a prototype.
Hey Fred, did you come up with an idea for your Mobius? Here is a design I'm working on. Requires taking the Mobius out of it's case.
View attachment 373702
Some fairing designs.
and a prototype.
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Lawrence-I like your mobius shroud design and clean prints. My shroud design is one piece with the camera inside an enclosure within the body tube; however, the lens is extended on a cable through the booster wall. I've printed early designs in PETG. The lens fits through a contoured end-mill cut opening in the booster tube. I'm ordering high temp tape to cover the external sections to hopefully avoid damage due to heat experienced at above mach speeds. Once completed and tested I'll post it, if there is interest. After flying your shroud, let us know how it worked out. Good luck.
Fred
Lawrence-I like your mobius shroud design and clean prints. My shroud design is one piece with the camera inside an enclosure within the body tube; however, the lens is extended on a cable through the booster wall. I've printed early designs in PETG. The lens fits through a contoured end-mill cut opening in the booster tube. I'm ordering high temp tape to cover the external sections to hopefully avoid damage due to heat experienced at above mach speeds. Once completed and tested I'll post it, if there is interest. After flying your shroud, let us know how it worked out. Good luck.
Fred
Printed the transition/motor retainer for my new scratch build. View attachment 373806
Sure! I'll post some 3D renderings later today. It's similar to the one I made for my L2 scratch build.Ben, Can you show us more of the motor casing design? Looks incredible!
It is held on by 4 screws that are threaded into the transition. Motor casing heat is no issue as I use a LOC motor tube as insulation. This design has been flight tested on my L2 scratch build 3 times on a J250 and two I180W's with no damage. This particular design is for 3" tube to 38mm motor tube. My L2 design is from 3" to 54mm motor tube.Ben- I'd like to also get more info on your excellent motor retainer. Is it screwed on or held in place by tabs or tapped machine screws? How do you avoid potential damage from motor case heat transfer during flight? It would be great to avoid paying $50 plus for commercial aluminum tailcone motor retainers!
Fred
Lawrence-Looks great! What method did you use to cut out the camera port in the fiberglass body tube?
Which filament are you printing with?
Also, you may want to consider positioning the lens at a 20 degree angle (or 110 degrees from zero) in order to catch more of the receding ground during flight. You can ground test at different angles to see what's best. Presuming dual deployment, once your drogue is deployed (if its stored below the camera section) you'll get video of the chute release and clouds at least until the main chute is deployed-should prove to be an interesting video.
Fred
I recently printed a 4 to 3 inch transition for a rocket build in progress. Currently, I'm working on a "through the wall" camera shroud for the mobius so that only the lens passes through the booster tube wall.
Fred, L2
ICBM, Camden, S.C.
KG4YGP
Made this little handy nozzle sizer. I only have #20, #22 and #28 and it works perfect for them.
View attachment 373856
It is held on by 4 screws that are threaded into the transition. Motor casing heat is no issue as I use a LOC motor tube as insulation. This design has been flight tested on my L2 scratch build 3 times on a J250 and two I180W's with no damage. This particular design is for 3" tube to 38mm motor tube. My L2 design is from 3" to 54mm motor tube.
I'll make sure to release more information about it soon so you can get a better understanding of how it is made.
View attachment 373902View attachment 373903View attachment 373904View attachment 373905
Some pictures of the 3D model. I printed it with PETG, no support needed at any point.
Thank you! I learn Inventor through years of engineering courses and it's pretty user friendly once you get to know it. As for inserts, this design and my previous one just use the screw itself to thread the transition. A more sustainable solution would be using metal inserts epoxied into the transition, but I have had good luck without them thus far. Regarding the motor tube, having a LOC motor tube epoxied to the transition provides more than enough protection for the PETG, no issues throughout my previous tests with J and I motors.Wow, Ben, that is some great design. I’d like to get to that point but I’m still in the early learning stages of the CAD software I’m using. Are you using heat set inserts to receive the screws? Also good to hear a body tube is enough insulation.
Tony
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