Found a shell on the ground at a launch a few months ago and my boy wondered if we could build a rocket based on it.
I did some scaling and found parts appropriately sized
I did some scaling and found parts appropriately sized
Winchester 308 Rocket
- Thread starter kenstarr
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I did some measuring and CAD design to come up with extractor groove part at the base of the shell rocket. Then off to the 3D printer! 
Check out the chamfer on the base
Check out the chamfer on the base
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FYI, the official dimensions with tolerances for all industry-standard cartridges are all cataloged here, with the documents available as free downloads:
https://saami.org/technical-information/ansi-saami-standards/
.308 has a tapered case. There are only a handful of cartridges with straight walls, and all the ones I can think of off the top of my head are rimmed.
https://saami.org/technical-information/ansi-saami-standards/
.308 has a tapered case. There are only a handful of cartridges with straight walls, and all the ones I can think of off the top of my head are rimmed.
The Estes Argent PSII rocket does the form factor when you shorten the upper tube; I was going to build it with clear fins but my buddy that was going to cut them was in the mist of a divorce and they never happened.
I like your version as well.
I like your version as well.
Huh? What did I miss? That brass casing in post #1 looks like a 308 to me and it is a tapered case, not straight walled?
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You didn't miss anything. My OCD would go through the book, looking for a straight-wall, bottleneck case, of which there are precious few.
It has occurred to me in the past to try to build a version of a 175gr SMK or whatever target bullet has the highest BC with clear fins. Would be a little different.
I have been chuckling about how flying the whole cartridge is going to resemble the graphics done by ignorant anti-gun propagandists where they portray the entire case flying out of the muzzle.
I think the point is that all bottleneck cartridges taper at least a small amount. I don't think the difference from perfectly straight is enough to detract from the concept for rocket design purposes.
I did a "Dirth Harry" A 44 mag rocket. like your idea also.
Yeah, I opted not to taper the body tube. My scale factors are based on the main body tube but nose cone and neck are close-ish for convenience
Ken
Ken
lakeroadster
When in doubt... build hell-for-stout!
What are your plans to make it stable? Big Lexan fins?
Great idea!
22 rimfire is straight wall but has that rim at the back end that would not be good for a rocket I'm thinking. 9mm and some other handgun cartridges are fairly close to or are straight wall - they do have that notch at the back, but at least it's not a true rim that sticks out.
22 rimfire is straight wall but has that rim at the back end that would not be good for a rocket I'm thinking. 9mm and some other handgun cartridges are fairly close to or are straight wall - they do have that notch at the back, but at least it's not a true rim that sticks out.
Here it is in an almost finished state. I may have forgotten to cut the fin slots... It probably didn't matter if it's before the vinyl wrap or not. If it gets messed up I'll just pull it off and do it over. The fins will be lexan. 
Good Job!
A while back I looked at doing a .50BMG rocket with fins made to look like ammo cans.
A while back I looked at doing a .50BMG rocket with fins made to look like ammo cans.
I love the ammo can fin idea!
I built the SPR bullet . It has a detachable fin rig. You could build one of those for launches. Reach out to Scott at fusion rockets and he may even sell you the laser cut ply parts kit for that lower part?
where did you get that chute?
it was a custom job from Steve at Front range Rocketry. He did a cool Iron Cross chute for my Mega Der Red Max too.
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