Is This The Best Insulation Material?

[@BPSspace]

Trying out slower and calmer pacing on this one - lemme know what ya think!

[@radioactivestudios9934]

I think your videos should be a bit slower paced, but I think it should be slightly faster than this one. Great vid though!

[@joeygorman3174]

imo maybe sliiiiightly quicker but i would take generally slow over generally fast any day

[@JamesChurchill3]

I'm only 23 seconds in and it's so sloooow! Why is this not a short I have no attention span. But nah seriously I like slower paced videos as my age smoothened brain does not absorb information as readily these days.

[@schmusland]

Did you make this video last Jan? The time stamp says 01/01/2023 on the microscope footage... Or is that the just the cameras default date stamp

[@Nedim-i7s]

Please mske a video about single-crystal materials that are used in jet engines as well as rocketry.

[@awesomecronk7183]

"Let's go on a tangent!" spends over half the video on the tangent Good stuff, thank you

[@harryganz1]

Then you realize the entire video is a tangent for the next video.

[@ducksonplays4190]

Hey, it is you!

[@chisel2008]

That's the best kind of tangent.

[@awesomecronk7183]

@@ducksonplays4190 hey

[@wow-roblox8370]

@@ducksonplays4190After everything, it’s still you!

[@giantfrigginnerd]

As an engineer these are honestly the best videos, loving it, more tangents please

[@kinexkid]

Speaking of ablation, just the other week I had an operation on my back called radiofrequency nerve ablation. They put big needles in me right up against my spine, and then put mini microwave emitters down the needle and they basically "burned" my nerves to kill them off. It works wonders for my pain because I have degenerative disc disease and those nerves are constantly being pinched for no good reason.

[@N0K71RN4L]

I had a Cardiac RF Ablation procedure a while back to sever an accessory nerve pathway in my heart. Didn’t know it was available for the spine. I have DDD too. Pinched sciatic nerve sucks.

[@newmonengineering]

I had the same procedure, it helped but I think I'm going to do it again soon because it came back. Hopefully all goes well and I can feel less pain in a month or so when I get it done again.

[@kinexkid]

@@newmonengineering I have to get mine done every 6 months because insurance says that's the minimum time between procedures, and I get a good 4-5 months will much less pain. It's definitely worth it

[@DirtStacks]

Hey man my specialists here in El Paso have been useless for my degenerative disk disease and treatment. They basically offered pain killers and therapy as my only two options, and my condition is worsening rapidly as it is now in my neck as well. I just wanted to ask if you are getting this done in the US by any chance?

[@kinexkid]

@DirtStacks yeah, I'm in central california, just east of the bay area. The route I had to take to get the ablation approved by my insurance was to first go through two rounds of steroid injections in my back to see if it responded well to it. It gave me maybe a week of pain relief, but the do tor said thays a good sign because it means that they are targeting the right spot, even though the pain came back rather quickly. Some people respond really well to the injections and never have to step up to the ablation, but I definitely needed it. I didn't go through my regular doctor either, I went to a place that specialized in pain medicine and anesthesiology.

[@evergreenappreciator]

FMI employee here! You're right about ITAR and NDAs so I won't say much about our products. The reason the old FMI website is dead is because we were acquired by Spirit Aerosystems in early 2020. I literally just finished packing some PICA for shipment with our intern, and pulled up this video to teach him about what it is and how it works. I must not have watched all the way through last time! We were stoked for the shoutout, haha. And yes, SpaceX came to us years ago to ask about buying PICA, but the sticker shock led them to develop PICA-X with the help of NASA.

[@RealAndySkibba]

Bo Jarnard has done it yet again. Fantastic video.

[@OrangeDurito]

Wasn’t Bo Jarnard his plant?

[@FailRaceFan]

​@@OrangeDurito Joe is just the human showing all the stuff boe does in ghe background

[@barongerhardt]

I really miss old internet. Companies/people really just saw it as an information source akin to encyclopedia. Boring tech docs, material data sheets, grad student research, pedantic details of something that only a nerd would care about. A phone call would often result in direction to a webpage where you could get all the details. Now days it is more of a marketing platform. Don't show them anything that they could use to compare and choose a different product. "We give 30% more power than the competition." Never tell us what the baseline was, the direct numbers, or which competitor they are referring too. Just the puffery marketing.

[@alanmcrae8594]

Probably another side effect of globalization. Foreign companies muscling in on markets so much that new customer capture via minimal online information became really important to sales. Get the prospect to call on the phone then sick a salesperson on them to manipulate them into a sale before they do too much internet searching and find a competitor.

[@citizenblue]

I had a similar issue just today looking for an oil filter for a truck. Google search for the right oil filter only brought me product pages for days, but not the actual filter number. Super annoying.

[@nikkiofthevalley]

That stuff still exists. You just need to know know the magic runes to put into Google.

[@Snookers_]

Honestly, it probably just comes down to companies becoming more concerned regarding ITAR compliance. Especially once a product has a defense application, the product and all associated info will be kept under wraps. Considering each violation equals up to $1 million in fines plus 10 years in prison, I definitely wouldn't want to risk it. Also, the specific example in the video of the Fiberform would almost certainly be ITAR controlled given its current application in spacecraft.

[@jhonbus]

I was going to make a comment about this, but you've already said pretty much exactly what I was going to say.

[@bjw0007]

Former composites M&P engineer here. The reason for the moisture pockets is because phenolic resin curing causes water to be formed. With such a thick section of phenolic, it is hard to impossible to evacuate all of the moisture formed during the cure.

[@abcqer555]

Awesome feedback. Are there any work arounds?

[@bjw0007]

@@abcqer555 I never really worked with phenolic resins (epoxy and BMI instead), but my understanding is more pressure would help, and just trying different things could help, like different breather cloths, cure cycles, etc. what would work for one part wouldn’t necessarily work with another.

[@otpyrcralphpierre1742]

Couldn't you use a Vacuum to evacuate the moisture?

[@4077Disc]

I actually do make phenolic heat shield material (at FMI, one of the companies featured in this video) and the vessels we make it in can’t do positive pressure. I can’t say much more than that, but yeah, no high pressure :)

[@bjw0007]

@@otpyrcralphpierre1742 The way I’ve seen phenolic cured is it is pulled under vacuum then put into an autoclave. Pulling vacuum is already done, it’s just that moisture will form throughout the part where it doesn’t have much chance of escaping the part before the part cures.

[@boatbomber]

Excited to see you at Open Sauce!

[@philipwhiuk]

I want to believe this is just opening lots of artisan sauces

[@laupoke]

He's coming ??? This is definitely the best event of all time

[@quentintrull4917]

NEW BPS VIDEO JUST DROPPED

[@mju135]

Beepis lol

[@EmazingGuitar]

Recorded last year lol

[@onurruzgar4635]

ACTUAL BPS

[@RocketVlogs]

Let's get a rally goin for the early viewers baby

[@bmatt2626]

I read phenol as "feenol", so when someone says "this curry needs more fennel" there's way less paperwork.

[@CDCI3]

Chemists generally say fuh-NOL

[@shepardice3775]

​@@CDCI3I'm only an undergrad biochem student, but i've only ever heard "fee-nol" or "feh-nol" from instructors. i say feh-nol myself, because to my ears it's distinct from fennel lol

[@cambridgemart2075]

@@CDCI3 No, they do not. A fuh-NOL is a tapered cylinder used to assist in putting liquids into containers.

[@CDCI3]

@@cambridgemart2075 nah, that's a FUN-ul, or maybe FUH-nul (or FUN-ool/FUH-nool, maybe). If you emphasize the second syllable of funnel instead of the first, you'd be pretty close, but the vowel sound of the second syllable is different. Maybe it could be written like fuh-NAL (or fih-NAL) but I think of "nal" as rhyming with "al" rather than "all."

[@CDCI3]

@@cambridgemart2075 Okay, I got it... Maybe. fi like in fish, then NALL rhymes with all. fi-NALL

[@C-M-E]

How I ended up getting 20lbs of phenolic powder involves a two year voyage on making liquid carbon moldable composite parts which snowballed into making graphene and reading a ton of NASA white papers on heat shields. There's a few methods to using phenolic power sans formaldehyde, but is a bit more equipment intensive with higher levels of heat and pressure. Naturally I clicked on this video double time to see how your journey progressed.

[@K31TH3R]

Assuming you're in a home lab, did you by chance synthesize graphene using the bottom-up flash method that Rice Uni published in 2020? If you did, at any point leading up to that synthesis, did you ever pause and think "Oh. Oh no. What questionable choices have lead me here?" Also, do you still have both eyebrows? lol

[@esecallum]

*No need for tiles at all. just drill lots of micro holes. then pump out dry ice out of those holes to form a cold co2 boundary layer. you dont even really need a pump. the heat of re-entry will cause melting of the dry ice and high pressure dry ice co2 to come out of the micro holes to form the boundary layer.*

[@k1ngjulien_]

me at 16:40 : Damn that phenolic liner took a hard hit if its that charred all around me at 20:20 : ITS NOT EVEN PHENOLIC! YOU TRICKED ME, CARBONATED MILK MAN!!!11!!11 awesome video as always :P

[@_snoot]

@BreakingTaps did an excellent video comparing Starship and Space Shuttle tiles, including examining samples of each using an SEM for chemical analysis and even making his own tiles. Unfortunately, it seems that video has been taken down which is a shame.

[@kstricl]

I was looking to see if someone else mentioned that video. I see a community post from 4 months ago about the silicone blanket used so I know I'm not misremembering it. I am guessing it's due to the tile from Starship 28 - SpaceX is pretty tight lipped about a lot of Starship; I can see how they wouldn't want that analysis just out there for it's competitors to see (Even though they obviously based it on NASA's work prior.).

[@ryanrising2237]

I was lucky enough to download that video when it was available, but it’s a bummer it’s not widely available right now. There’s good information in there.

[@joshmyer9]

He took it down due to possible ITAR problems, but might restore it at some point (check out his Mastodon for the details). I'm guessing this means it's gone for a long time, sadly.

[@el7440]

i love your tangents joey i promise i do please keep going on them because i think the same way and i love seeing how it comes back around

[@jackfrost3573]

A guy was selling whole heat shield tiles on Ebay. I questioned the guy and ended up buying one. After I received the tile and I asked him "where did you get this"? he answered, "I pried it off of a Russian space shuttle on display in Russia". LOL, I feel bad but happy I have it.

[@zachbowles4516]

that's an insane piece of history you lucked into. Keep that safe!

[@kevintaunt4385]

If that was the Buran, I think it’s basically abandoned, no? (So you didn’t really do anything bad.) 🤷‍♂️😎👍

[@silverXnoise]

When was this?

[@jackfrost3573]

@@silverXnoise years ago...but it was near the end of the shuttle program.

[@jackfrost3573]

@@kevintaunt4385 It was an outside museum display in Russia someplace.

[@AIM54A]

On a liquid Bi-prob I made back in the 90s I initially used standard fiberglass and an ablating resin as a liner and had good results.. I switched to a silica cloth with an overlapping weave and the engine would cough up what looked like fur balls as it de-laminated.. I switched back to fiberglass that would melt and coat the nozzle throat with glass preventing erosion and no more fur balls.

[@__Enderman__]

0:14 I think you put it upside down

[@ABa-os6wm]

"Something iswrong with this rocket motor". Yeah, it's upside down ;)

[@BOWUNCE6126]

remember pointy end up flamey end sown

[@lajoswinkler]

The problem with drilling phenolic resin (Bakelite, etc.) is the dust that is formed. Wearing a respirator is not enough - there has to be intense ventilation like a fumehood. People often keep the respirator on while doing something and then just remove it. *The finest dust stays suspended in air.* Some composites would also use asbestos as the reinforcing material and grinding that is so much worse. Also, pyrolysis is not a straightforward process. It's not resin and then boom, carbon. All the brown gunk between it, all those smokes and vapors, those are some NASTY things, seriously carcinogenic and corrosive. Really good video.

[@mrwalter1049]

I like the pace of this one. It let's ideas breathe for a moment before continuing with more details. 👍

[@TheReaverOfDarkness]

instructions unclear, breathed resin particles

[@ryanrising2237]

I’ve also had that same experience where the further back I go the better information is available. That’s a disturbing trend, and I hope it doesn’t continue.

[@rabik_dev]

"This char layer is weakly attached. And I don't mean it's attached every seven days" -- 9:45

[@perli216]

I don't get it

[@arjunyg4655]

“weekly” (every 7 days)

[@perli216]

ah

[@marlingodspeed1526]

Another banger from Joe Bizlington

[@Oldman5261]

Very nice and informative video. Everything about your video screams “I am an engineer and I love learning, experimenting, and creating”. Enjoyed your video.

[@motomuso]

kudos for treating your walls for better acoustics. Many don't and hearing the room is very annoying. Great video!

[@cole0096]

You have gotten sooo much better at content creation since I first started watching you some 5-7 years ago!!! Congrats!

[@haikuheroism6495]

I really liked this video! It was great to just chill and sip caffeine and watch a cool rocket vid while I wake up for the day. Idk how much effort went in but I'd love to just hear you talk about cool space and rocket stuff more often.

[@anukrathnayake]

damn, your so close to a space shot (kinda) but a P impulse motor is right next door to a Q, your videos are getting better and better each week. Keep going! Edit: love the thumbnail changing every week

[@SaintJohnYT]

Thank you Borbo, I was on a work trip the week this came out so I missed it. Thanks for pointing it out to me.

[@uaaadingding]

Not only is a digital microscope awesome, it lets you travel back in time. For the cheap Amazon ones it's only a bit more than a year though. Wonder how far you can travel back with the more expensive ones.

[@mylegalname9852]

I had no idea digital microscopes were so cheap. Was looking for another comment that talked about them. I think I've decided that I should get one soon. And if I don't end up using it all that much I can just come back to right now and tell myself not to.

[@mjrFPV]

Here in eastern Europe we use Bakelite even to make knifes handles :D Now I know why so many of us is dying from cancer

[@Tandem1221]

At first sight of that material I just remembered that old metal-and-Bakelite tables at every old science laboratory in schools and universities

[@MikesTropicalTech]

I was working on the brake light switch in my 1973 Porsche this morning and it struck me that the housing of the switch looked like Bakelite.

[@chris-hayes]

I was curious about this, and looked it up. But, online discourse is just pretty much the same as the video states, pretty stable and supposably safe if you don't start sending dust everywhere. Still makes me want to avoid Bakelite.

[@Planetery_Dragon]

BIG MOMENT BPS SPACE VIDEO

[@TheEpicDragonCat]

Yeah!!

[@SarahKchannel]

When it comes to ablative cooling or shielding, that is the same for normal construction wood. A well engineered wood building fairs better and longer than a steel structure, for the reason that wood has a 'defined' burn rate, it deforms little while it burns. While steel warps and tears apart much before it melts and fails.

[@SimplyDudeFace]

The detail level you are explaining at is way over my head, but I love hearing it and you are explaining it well enough that I can easily follow

[@stroodlepup]

watched those reentry vids live, they are gnarly AF

[@kemfic]

very solid introduction, minimal padding on the actual meat of the content. love this form of video!

[@k3tchup687]

Great video, love the slower more detailed pace

[@DH-xw6jp]

I'm not a rocket surgeon (and only understand _maybe_ a quarter of the technical jargon you use), but i like how you explain things. Keep up the sciencey stuff.

[@TheReaverOfDarkness]

First video of yours I have seen, immediate sub! Good work! 21:20 missed opportunity to say that the Sun is way too brilliant

[@Georgewilliamherbert]

Good video. Pacing worked great.

[@AlexisRodriguez-wi7hf]

This is the only channel where I really enjoy to see the sponsors section, I think is a way to support this content

[@Modna89]

Another good effect of the ablation of the chunks of amorphous carbon that gets torn off - all the head dumped into that "foamy" material is mechanically removed. It no longer provides insulation, but it takes all the heat energy away with it as it ablates off.

[@HotelPapa100]

You are probably too young for this to concern you, but one thing about phenolic resin is that it is the first industrially produced synthetic resins. Production of Bakelite started in the naughties of the 20th century. When I started to be concerned with such stuff there were maybe 10 basic resins around and that told you most of what you needed to know to assess their suitability for a certain purpose. Phenolic (Bakelite) Melamin (Mica) UP, (unsaturated) polyester Epoxy Now entering the thermoplastics: PE, polyethyliene PP, polypropylene PA, polyamide (Nylon) PC, polycarbonate (Makrolon) PMMA, polymethylmetacrylate (Plexiglass) PU (Polyurethane) PTFE, polytetraflorethylene (Teflon) Therre were some exotics, but those about had you covered for most applications.

[@headforscience]

I love this channel so much. It taught me priceless lessons! ❤

[@adamrak7560]

Fun fact: wood is a phenolic composite: cellulose with phenolic compounds crosslinked It does work as a heat shield, similarly good as other phenolic composites, but obviously inferior to optimized versions.

[@RomaPacocha-ze3ms]

I'm very glad I found your channel. And your Private Group. Help me a lot!

[@JoviusAquariums]

I love the composites stuff. I am an aerospace engineer working on composite aerospace structures. We love our phenolic, cork, aramid and cf.

[@ShaggyMummy]

Fun Fact, Phenalic Resin is also Commonly used in making Printed Circuit Board Substrates. literally Space Age Technology.

[@damon991]

Thank you for the lesson professor Joey B

[@FruitLoops_]

Finally you made an entire video on a tangent! I've been waiting for this for years!!

[@Anne_Visch]

every time i watch you video's i dont feel stupid and actually feel like i am understanding what you are explaining. so i just want to say thx and keep it up i really enjoy your video's

[@snwfx5295]

I really enjoy your content. I am no rocket scientist, but it's just very interesting and I love your content. Even at this slower paced video it's very enjoyable to watch, just as any other video from you! Keep it up :)

[@TheXnyu]

this is exactly what i like to watch, thank you, great explaination that are fun to listen to

[@fraserpaine5783]

This is just unbelievably good content. Reminds me of the OG Engineer Guy aluminum can video. I.e. the kind of videos I want my kids to grow up on.

[@dubby4062]

i finished eating my canned guava halfs and jelly cup at 3:02

[@johnholleran]

Great video! Loved the pace, learned a lot. Keep up the good work!

[@NathanaelNewton]

It wouldn't be a BPS space video without ITAR being mentioned at least once

[@woodmanengineering9708]

Great stuff!! Have used Phenolic mechanical wear surfaces in Paint ovens for years. I Feel validated.

[@amandagunter618]

"

[@amateurshooter6054]

Thanks Joe

[@bigguy78246]

Great video love the side quests you take us down.

[@victorreppeto7050]

Well, they say timing is everything. Your timing is excellent. They've been talking about heat shield panels on Starship on several channels this week. Thank you so much for sharing what you know. I'll have to share this 1 at the Makerspace this weekend.

[@nerdtronaut]

A LITTLE tangent! Very nice video to watch Joe.

[@philliphaasbroek]

I worked with that type of brick in a pottery factory. The ovens were lined out with these amazing light bricks.

[@emilywalker6772]

you are my favorite youtuber! excellent as always. good luck on the space shot!

[@cambridgemart2075]

I was going to mention the ITAR issue as, having worked for a non-US defence contractor in the past, our motor suppliers had to change the liner material in the new generation motors because the original material was now ITAR controlled.

[@brendan8915]

Hey Jo, from one sound/aerospace nerd to another, an ultra minor detail here but I really loved the slide-projector sounds from 7:49. peace x

[@NeonNijahn]

I feel so alive! Love a good tangent!

[@a1osborne]

You are so great at these! Bravo!

[@TheMchip]

learned so much!!! love it thank you!!! love all your videos!

[@Hardware_Hermit]

Kinda works on the same principles of charring/burning wood for waterproofing, super interesting video

[@davidstisher3495]

I test sensors the aerospace industry uses to test their heat shields and other heat flux oriented applications. Great video as usual. Fun to see the end product.

[@jamest18]

I work at the company that makes the material used in solid rocket motor nozzles for the gem 63 xls used on Vulcan (and other solid rocket motors but that's the coolest in my opinion) along with the PICA used in many NASA heat shields (not Orion, she's too wide for us to make stuff for, except the nozzles for the launch escape system, we make that stuff too). Cool to see some of the stuff I work on make it into a cool video like this.

[@lohsolomon402]

At this time, you know when a video is not sponsored by brilliant. Thumbs up for Joe. Im eagerly waiting the next simplex video😂🙌🏾😁

[@KevinRiggle]

I feel like this video is telling me a surprising amount about why marshmallows toast and flambé the way that they do, take surprisingly long to burn through, and why often the burnt skin can be taken off and the marshmallow toasted again more or less like it was the first time. Which is not what I thought I would learn when I clicked on a video about making rocket motors, but hey, science

[@mattilindstrom]

For being composed of such ancient materials, linen phenolic truly is a wonder material. It's machinable even with simple tooling, and will accommodate very fine details. In addition to very high temperatures its performance in cryogenic temperatures is remarkable. Dunk it in liquid helium and it will have good dimensional stability and resistance to mechanical stresses.

[@hytralium]

Joe at 1:30 „wanna go on a tangent with me?" Me at 15:00 „is this a joke??“

[@TsunauticusIV]

I started working at a factory a few weeks ago. I was instructed to use a big firehose to wash off the 2 large rubber tire loaders I run. I spent hours washing them. I was SOAKED afterwards. I noticed I started to burn and itch after awhile. I mentioned it to a coworker and I was informed the water that I was using was not fresh water. It was water that had been collected and then reused. This means there is likely, at the very least, formaldehyde and some other nasty chemicals in this water. I had no idea it was recycled water! I want to get a sample of this water and have it privately tested to see what I was exposed to. I spent a full 12 hour shift drenched in this stuff and had no warning it was potentially harmful water. This was a couple weeks ago and I still have bumps and weird rashes all over me. Can you recommend someone that could test this water to see what is in it?

[@DavetheTrollFace]

I think the pacing really resembled a SmarterEveryDay/Veritasium Video, two channels I absolutely adore. Hope to see more of it 👌

[@elburropeligroso4689]

I was reading Titan II by David K. Stumpf and reached the part where it described the makeup of MIRV warheads. The re-entry vehicles were described as having heat shields made of phenolic.

[@classic_sci_fi]

This is the first analysis I've ever seen on this. Good work. It looks like a high tech version of Bakelite!

[@jtcustomknives]

Side note: that the phenolic linen material makes amazing knife handle material.

[@huzudra]

True story, phenolic resin is used in cars too. Brake caliper pistons are made of it sometimes on some vehicles in some applications. Usually I see it on light duty trucks, 1500 series and up, but once in a while on a car caliper as well.

[@grnbrg]

I'm not a rocket surgeon, but I'm pretty sure the flamey end is supposed to point down. ;) Thanks for another interesting vid!

[@CDCI3]

Pyrolysis just means chemical bonds are broken due to heat. That often comes with gas formation, since it's pretty common for water or other small, low boiling compounds to form, but it's not a rule that you form a gas. In this specific application, your description fits.

[@SodiumInteresting]

It actually means undergoing thermal decomposition in the absence of oxygen or a halogen

[@CDCI3]

@@SodiumInteresting not necessarily. If the compounds undergo thermal decomp without reacting with an oxidizer, the presence of the oxidizer doesn't change things. That's still pyrolysis. At the same time, why would pyrolysis specifically exclude (those) oxidizers? Does that mean high temp hydrolysis of fatty acid esters is pyrolysis? No. While pyrolysis is often performed in an inert atmosphere, that is only to prevent nonpyrolytic reactions from occuring before pyrolysis. Some compounds, however, will pyrolyze before oxidizing, in which case the inert atmosphere is unnecessary. Pyrolysis just means breaking covalent bonds by providing the molecule with so much heat energy that they break.

[@SodiumInteresting]

@CDCI3 okay then pyrolysis is thermal decomposition without combustion. Hydrolysis is breakdown of a molecule by the addition of water so that's something else

[@SodiumInteresting]

@CDCI3 in some cases pyrolysis occurs before oxygen has a chance to penetrate a material, but most things will combust rather than undergo pyrolysis given available oxygen or chlorine etc.

[@CDCI3]

@@SodiumInteresting fair, and that's actually not necessarily the case here, but as chemists we often have chemist-specific definitions of terms that are narrower than the general public's usage, which is why I said his description fits. It looks like combustion to me, but it fits the literal word parts (fire + lyse or heat + lyse), so I figured that to a chemical layman, that would probably fit.

[@EthanfromEngland-]

I really like this pacing of video but i get why most might not. Maybe we need a BPS 2 channel which is for these slower videos? Idk maybe not. Either way really enjoyed this video.

[@joeyrosenblum9899]

For analyzing composites like the phenolic-linen one in the video, if you wanna go crazy and look at the cross section to look at FVF, void content and other cool stuff, you could try casting and polishing the samples and then use a digital microscope. TBH I used to work in a lab that did this and it was cool when it worked but its a ton of effort. Also, I know you are very careful about safety and I always appreciate you mentioning it, but it might be good to wear a lab coat when you work with composites to keep the dust off your skin. I'm sure you have protocols in place for that but its a cheap and easy way to boost your safety.

[@JulietNovember9]

Great video. Love the pace. I did go to the FAA pdf you cited and it's a neat paper! Was wondering what larger body of text/book it's from. Is there one?

[@SebPlaySpaceflight]

90% tangent 3% rocket stuff 7% ad A great video as always🔥🔥🔥

[@ianbrown3275]

I love how Joe is “learning” with brilliant outside on his laptop while wearing sunglasses, then procedes to tell us WE can’t see it when I’m pretty sure he definitely can’t see it lol😂

[@ltpinecone]

You know it's gonna be a good one when Joe asks if we want to go on a tangent!

[@indycinema]

thanks for the work looking into this.

[@OLHZN]

Loved this video. 🤘

[@webbles]

Fun fact that was probably already mentioned but TEB (triethylborane) was also used to ignite the JP7 fuel used by the SR 71.

[@GarryFisherProRider]

I don't know yet if you mention Starlite further in the video but you can DIY such heat shields, using various regular household products.

[@konstantinjirecek970]

Phenol and formaldehyhe were used as disinfectant in healthcare (typical smell of old hospitals). Formaldehyde is used even now for working with tissue samples in pathology.

[@azmanifikacija]

To be honest. I love the pacing of your videos, thats part of the appeal too.

[@MrGrimx1]

The nose cone and fins on the AGM-69A Short Range Attack Missile (SRAM) were made of phenolic. The repair was a nightmare!

[@ritishify]

8:00 I think that it would probably burn different when heated by the friction from the fall of the craft, because of the changing composition of air at different layers in the atmosphere. Maybe you mention this afterwards but I wanted to point it out now that I remember. To be more specific, I think that the higher concentration of oxygen where you burned it, in contrast with the lack of it "up there" would make a big difference.