Nytrunner
Pop lugs, not drugs
AT aft closures should be similar. Anyone have dimensions on those for Ben? I only fly CTI 54s
I'm trying to make the retainer pretty universal, but I will most likely use AeroTech motors.AT aft closures should be similar. Anyone have dimensions on those for Ben? I only fly CTI 54s
Aerotech 54: https://www.aerotech-rocketry.com/c...h_rms_ext_dim_dwgs/54mm_hp_rms/hp_54-1280.pdf
Anyone have snap ring dimensions for him? Loki, etc....
I wouldn't consider over $50 for a 54mm retainer cheap. I can't seem to find specific dimensions for them either.Model your retaining sizes after AeroPack retainers. They fit all the major manufacturers (AT, CTI, Loki, etc.) Better bet would be to actually buy an AeroPack retainer as they're actually pretty cheap for what you get.
https://aeropack.net/retainerdimensions.aspI wouldn't consider over $50 for a 54mm retainer cheap. I can't seem to find specific dimensions for them either.
https://aeropack.net/retainerdimensions.asp
I understand you're printing most of the parts yourself for this rocket but it's not unheard of for a HPR rocket with a 54mm mount to end up costing nearly $1000 once all parts are included. On that scale, $50 for 100% positive motor retention is indeed cheap.
I have seen someone at a launch use a circular aluminum heatsink as a fincan before. It fit perfectly over a 29mm motor and was beautiful. It was 25 thin aluminum fins I think. 29mm minimum diameter.too many fins?
When they all morph into a cone or solid mass at the bottom!!
(Actually, there is a point at which the air flow between closely spaced fins come to a stop, essentially acting like a big solid object..)
I hope this printing isn't using any of the propitiatory design work from a certain 24mm project.
Nice work so far.
Uhhh what? I know nothing about a proprietary design. Every part was made from scratch in Inventor based off the OpenRocket file.And I've been trying sooooo hard not to say anything on those lines (-_-)
Uhhh what? I know nothing about a proprietary design. Every part was made from scratch in Inventor based off the OpenRocket file.
Went straight over my head. I'll continue on my merry way.Please ignore that, it's utterly irrelevant to your build. Somewhat of a forum inside joke that you are blissfully unaware of (I hope you stay that way).
All of the parts I have printed so far: 2 notched centering rings for fins, a tapered and airfoiled fin, and the baffle system.Went straight over my head. I'll continue on my merry way.
Those all sound iffy for a 54mm HPR.I hear Weld On 16 works for PET-to-PET, but Weld On 4 not as much. I have no personal direct experience.
Gorilla Superglue is also supposed to be okay due to a small percentage of dissolved rubber.
Making molds using what?Of course, you do have some good blanks for making molds.. if you want to think about it that way...
(Yeah, some plastics are a pain to glue..)
I was planning on just using the 3D part itself Haha. Might add carbon fiber or fiberglass centering rings later on.Cheesy grin!! Use the 3D printed parts to make moulds to cast the parts in resin, fiberglass, carbon etc..
You make a 2 piece mold, a negative of the parts, typically out of silicone.
You then part them, remove the plastic part, and either lay up the halves with fiber n epoxy or you just pour in a resin of some kind.. look up mold casted parts..
What is the span on your fins? A good rule of thumb is to make the span at least as large as the body diameter. Possibly larger.
3D printed ~ free+1.
I don't think there is any added value in 3D printing your fins. Just get standard fiberglass stock and you should be fine with 4 fins.
P.S. My level two rocket had 9 fins.
3D printed ~ free
My current design have a pretty low span (3" at tip) so I'll probably be remaking them.
LOL. For some reason I was only seeing the first page of this thread when I posted my reply. I just saw the rest of it and the setup looks great. Sorry for the distraction...
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