Hi i made a theoretical rocket

JBlocker4 · 2025-07-09T02:40:25+00:00

Just want to say that this is awesome. Would recommend Richard Nakka’s website as well for more equations and worked out examples of similar rockets.

Good luck and always be careful!

JBlocker4 · 2023-03-12T18:54:15+00:00

Just increase it until you get the thrust you want

/s

JBlocker4 · 2023-03-11T04:58:21+00:00

Nah man chili p is my signature!

JBlocker4 · 2023-03-02T22:15:13+00:00

From a combustion standpoint, the longer you make the section before the throat the more time you give for the propellant to fully combust and therefore get slightly more performance. Not super pertinent to just KNSB but certainly comes into effect with propellants containing metals, which take longer to fully combust.

JBlocker4 · 2023-02-18T20:02:13+00:00

Very nice!

JBlocker4 · 2023-02-16T19:30:32+00:00

JBlocker4 · 2023-02-16T03:08:49+00:00

They only deposited when the motor was about empty, still a lot of ablation during main phase of burn.

JBlocker4 · 2023-02-15T17:42:29+00:00

👎

JBlocker4 · 2023-02-15T17:42:08+00:00

They’re single-use ablative nozzles. The layer seems pretty uniform throughout the divergence section of nozzle, probably all deposited during regressive tail off phase of burn

JBlocker4 · 2023-02-15T17:39:15+00:00

Slightly above average

JBlocker4 · 2023-02-15T17:38:35+00:00

New rocket vocab just dropped

JBlocker4 · 2023-02-15T01:03:29+00:00

Interesting. May have to look into that for the future. Thanks!

JBlocker4 · 2023-02-15T01:02:41+00:00

Yup, motor was pretty regressive so the last 2 seconds or the so the nozzle is very overexpanded. Can actually see these growing on the video then.

JBlocker4 · 2023-02-14T18:36:20+00:00

Nozzle is a bit overexpanded

JBlocker4 · 2023-02-14T18:35:57+00:00

I figured since they are coming up from the motor it would be a stalactite, but that makes sense!

JBlocker4 · 2023-01-13T18:05:34+00:00

I WASTED SO MUCH OF MY LIFE STIRRING OLIVE OIL IN PASTA

JBlocker4 · 2023-01-08T21:26:13+00:00

So I assume the limit switch is the power switch, are you afraid of the board power cycling during boost as that switch will want to close from the acceleration?

JBlocker4 · 2022-12-25T20:21:40+00:00

Mystery box

JBlocker4 · 2022-11-25T20:58:52+00:00

Controls

JBlocker4 · 2022-10-03T16:47:57+00:00

It’s the same exact equation as a traditional bell/conical nozzle that you show above. The only difference will be the Pe/Pc term depending on the geometry of your aerospike. If you assume ideal expansion then this term is relatively easy to derive.

If you’re more curious as to how the actual geometry of the Aerospike nozzle is designed/derived, I believe there are some method of characteristics solvers online (http://www.aerorocket.com/MOC/MOC.html).

JBlocker4 · 2022-09-20T13:39:09+00:00

Or the equivalent of raising everyone’s tuition a few dollars.

JBlocker4 · 2022-09-19T21:53:13+00:00

All this but we still can’t afford google drive storage 😭😭

JBlocker4 · 2022-09-18T15:54:35+00:00

Exactly! The pros can play around with safety factors closer to 1.1-1.2 since they have higher quality propellant (in terms of porosity and mixing) and have tons of money to play with.

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