Will it fly? Fun with improbable aerodynamics.

[KenECoyote]

(Hmmm...I thought I had posted this reply earlier.)
I do envision a version closer to the forward cone and similar to Y3's second design. It would be without a nose cone, but motor mounted up to (or above) the lip of the cup and just partial fins inside the cup (center omitted to allow exhaust gasses through). In my mind, this should work and look like a regular cup from the side view.

I built a version with internal spin fins and forward motor first as a test. I was debating adding the rear ring and fin assembly and decided to forgo fir simplicity.
I launched it this morning on a 1/2A3 - it left the rod fine, but then then...

the cup became a tumbler.

Unfortunately I forgot my phone, so no pics or video. I'm thinking of trying it again with the internal rear fins and maybe a bit of weight up forward.

 

[cwbullet]

View attachment 526752
View attachment 526754
I built a version with internal spin fins and forward motor first as a test. I was debating adding the rear ring and fin assembly and decided to forgo fir simplicity.
I launched it this morning on a 1/2A3 - it left the rod fine, but then then...

the cup became a tumbler.

Unfortunately I forgot my phone, so no pics or video. I'm thinking of trying it again with the rear fins and maybe a bit of weight up forward.

That will fly.

 

[KenECoyote]

Als if I can get this design to work, there's potential for a staged one like one of the above designs...Double Shot!

 

[KenECoyote]

That will fly.

Haha, Thanks for your vote of confidence!
Now that I think about it, I should've added the rear inner fins. Aside from helping to stabilize it, given this is a tractor-like config, there should be more weight (and/or drag) rearward.

 

[lakeroadster]

Will it Fly. Have you defined what this means in regard to your rockets?

Is it that the rocket is stable and recovered undamaged?

 

[Sooner Boomer]

View attachment 526752

View attachment 526754
I built a version with internal spin fins and forward motor first as a test. I was debating adding the rear ring and fin assembly and decided to forgo fir simplicity.
I launched it this morning on a 1/2A3 - it left the rod fine, but then then...

the cup became a tumbler.

Unfortunately I forgot my phone, so no pics or video. I'm thinking of trying it again with the internal rear fins and maybe a bit of weight up forward.

https://www.rocketryforum.com/threads/red-solo-cup.34606/

 

[KenECoyote]

https://www.rocketryforum.com/threads/red-solo-cup.34606/

Oh I'm well aware of the usual cup rocket designs and have made maybe a dozen...the diff here is trying to get it to fly upright vs. upside-down...just like it's easy-peasy to fly a 3fnc upright, but trying it upside-down is another matter.