David Yoon

Rockets are life. Just another day at the rocket factory. - Components Engineer @ A Rocket Company

[David Yoon @DavidKYoon]

@mcrs987 Hey someone throwing vague statements on the wall is bound to get it right. Just give everyone a different failure mode to post!

[David Yoon @DavidKYoon]

@Pb_0_0 @TimSabeanSr @esherifftv 99% of the time someone responds with a hand wavy response in the form of generic topics and concepts with a condescending tone, the person has 0 clue what they are talking about and want to sound smart.

[Relativity Space @relativityspace]

Throttle valves, isolation valves, igniter solenoid valves – you name it, we've made it.

[MrBeast @MrBeast]

I’m gonna give 10 random people that repost this and follow me $25,000 for fun (the $250,000 my X video made)

I’ll pick the winners in 72 hours

[David Yoon @DavidKYoon]

MDC in less than a week after the first hot fire of a brand new engine! 💪so proud of my team!!!

[Relativity Space @relativityspace]

📣 Aeon R Mission Duty Cycle complete!!! Last night @NASAStennis #AeonR burned in a flight-like configuration for 143 seconds at 70% power – marking a record-breaking pace for engine development and a very speedy 48-hour turnaround from Aeon R's first ever hot fires to successfully completing a full flight duration burn.

< 2 days Aeon Rs first hot fires ➡️ Full MDC
< 3 months ➡️ Powerpack install, testing, conversion to full engine, hot fires
< 1 year empty land ➡️ dual-bay vertical engine test stand
≤ 2 years ➡️ 1,000+ Aeon R component level tests

[David Yoon @DavidKYoon]

We did the thing!

[Relativity Space @relativityspace]

Fired up our first Aeon R engine hot fires this week. Sound on.

🎯 10 seconds of fire.
✔️ Validated component harmony during start up, at target power (70%), and shutdown.
🏅️ Strong start to test campaign. Initial hardware inspections look healthy.
�� Longer duration. More power. More blue fire.
📍@NASAStennis R Complex, new dual-bay vertical engine test stand

[David Yoon @DavidKYoon]

Hey that’s an engine where a power pack was only a few weeks ago!

[Relativity Space @relativityspace]

First look: Aeon R on the test stand. 🔥
#TerranR

[David Yoon @DavidKYoon]

@SciGuySpace I remember there was a whole environmental assessment for Electron in NZ before their first launch about dumping lithium batteries into the ocean. Something about rockets attract a lot of attention.

[Relativity Space @relativityspace]

🧵800+ tests. &lt;24 months. 2 states. Multiple test cells. Break down our 4 testing buckets with us.👇

[Relativity Space @relativityspace]

Package secured. #AeonR powerpack made it to @NASAStennis and found home on the R stand.

Blue fire 🔜.

[Relativity Space @relativityspace]

📍Long Beach Aeon R turbopump testing is happening now. Yup, you heard it right - we've got our test facilities up and running at our HQ, starting with the cryo test of an Aeon R turbopump. 👇

[David Yoon @DavidKYoon]

@ashleevance Korea is over there running on KakaoTalk

[David Yoon @DavidKYoon]

@cragbot1 @TheBrianMcManus What’s the low cycle fatigue behavior of composites loaded in compression?

[Relativity Space @relativityspace]

New skirt, who dis? Testing a new article configuration for Aeon R this week, complete with a 3D printed nozzle skirt. A successful operation with lots of good data to inform future tests.

[Relativity Space @relativityspace]

Aeon-R: “Does my new skirt make my flames look fat? 👗”

Us: “You look absolutely stunning.🔥”

#TerranR

[David Yoon @DavidKYoon]

@torybruno @lutz_o_richter @Cosmic_Penguin @DerekdotSpace @Friendship718 Flange gapping at the sump interface?

[David Yoon @DavidKYoon]

@torybruno @thenerdium What about a RS 68? Sounds like you aren’t using them anymore ;)

[David Yoon @DavidKYoon]

@torybruno not a typical structural test problem. I suppose even LN2 won’t be cold enough to simulate LH2 temps. Hope the corrective actions are straight forward.

[David Yoon @DavidKYoon]

@torybruno Was it a workmanship/design related failure or a test/operational related failure (like someone forgot to open the vents when draining the tanks, etc)

[David Yoon @DavidKYoon]

@ursamajortech 50,000 lbf per the website, but reckon at least +- 10% depending on build to build and prop conditioning.