Not enough people confirm negative experimental results. Such a good way to improve your intuition.

This is my tributary comment for the algorithmic gods. May your subs grow ever higher

Thank you for avoiding sponsors, may the algorithm be with you.

As a former Turbofan Test Engineer for Lockheed and Rolls-Royce at Stennis Space Center on the huge Trent engines, this video makes me happy!

This guy is my favorite mad scientist.

You got a reduction in thrust because the volume of air entrained couldn't make up for the massive pressure drop the augmenter created. It expanded the the nozzle area rapidly reducing exhaust velocity. Lower exhaust velocity for relatively the same air mass flow means a reduction in thrust. It works on the pulse jets because their exhausts are at a much higher velocity (supersonic) due to the fact they have a detonative combustion process compared to deflagrative for the jet engine, so the augmenter essentially becomes like a convergent-divergent nozzle for them, helping their exhaust expand for greater velocity.

The fact that you published video with a disappointing result demonstrates your integrity. I'm looking forward to the pulse jet iteration!

I did notice the fact that you do not advertise on this channel. In fact, that's one of the main reasons why I like and respect this channel so much. It is an unavoidable truth that whenever a UKposts channel starts adverting products and/or services which the host will never use, there is a high probability that a gradual change will start to take place. The motivation to produce a video starts to be more and more driven by financial rewards rather than intellectual ones. A line of thust is cut between the channel and its audience. Some of the audience will, to an extent, feel conned for having been lured into a long, seemingly useless, perhaps misleading advert. Thank you ever so much for honestly caring about your viewers and their viewing experience. Such posture will never go unnoticed.

Thank you for not having annoying sponsorships. Love your channel

They are alive!

"This is my tributary comment for the algorithmic gods. May your subs grow ever higher." Greetings from Brasil!😃

Quality of this channel is absolutely stunning. Thank you for making this content and thank you for not killing us with ads!

Propane guy here. You have 2 holes near the torch base. That uses same principles (i think it is some type of venturi) to mix air with jetted propane.

I am a tech geek! I love watching you put together projects that, as a kid, I could only dream about! Thank you!

One should never underestimate the Reynold's number in such a setup with fast moving turbulent gas flow. However, there are good news. There is already a working and well proven augmenter for continuously operating jet engines, that improves power and fuel economy significantly: It is termed the turbo-fan concept. You need a turbo shaft engine with a large fan at the intake face, driven by a planetary gear box. Fan and engine are mounted coaxially within a tube. the main wirking principle is that of a gas-pump. Additionally, the hot exhaust gas stream provides more work - close to Carnot's efficiency with optmised engines. Consequently EGT of the whole system is much lower.

i heard this saying once "its more important to know you are wrong than to know you are right" and i love it. we need to appreciate being wrong some times

Impressive is a understatement. These guys need a raise. You guys rock. 😊

fancy suit, no tie, matching hat, arrive via chauffer .. go to the big boy gun show looking right

One of my favorite channels, thank you so much and please don't stop putting out this amazing content.

Always appreciate your work on these videos. Thank you once more!

You know, I didn’t realize this till now but this channel is a modern day Mr. Wizard for adults.

You got my like. Just for not getting stupid sponsors! If i could give 2, id do it as well because i love these informative video's! Keep up the good work 💪🏻

You guys rock, I'm glad you are still pumping out the videos.

Thank you for all the research and development that you and your team do! I've started making one of the sound panel projects and I'm really excited to hear the results later. Keep up the great work!

Can't wait to see and hear you light up the pulse detonation engine especially. Always love your content.

I got excited when you said "Rotating detonation engine". They are the engines of the future.

Last week I was checking for New videos. YAY! Great work as always!

Great as always. Appreciate you guys very much.

Been with you folks for over 4 years now. Just shared the Tesla boat video with someone earlier today!

I love this channel. Dude explains stuff sometimes in such great detail I get lost on the point of the video, but holy shit he's like the genius dad everyone always wanted.

I love this channel. Thanks to these guys I learn every time I watch. Keep up the great work and I'm excited for 1 million subscribers!

High quality content as usual. Keep up the good work!

Time to wake up the neighbors 😅 when they ask just tell them its your industral hair dryer 😊

I love how deep you got here! So few channels (probably none as much as you) do this, and as someone who does some light research myself, I really enjoy this.

love your videos, ive never been dissapointed with any of them. thanks for making them for us

The delivery and the content of those video are so professional! You are setting a quality standard here. Thanks for making them!

You express your thoughts in a well-planned, precise way. You avoid the usual parasitic adjectives and interjections that connote emotions and beg for empathy, but would actually deflect attention from the fine explanations that you offer. This manner is characteristic of an inquisitive scientific intellect that converses with nature through the language of experiment. The description of how and why a turbo-jet engine works is concise and in my view perfect. (There, I fulfilled my moral duty to write a long comment :) But the complement is well-deserved).

I always love how informative your videos are. I’ve learned more about jet engines than I ever knew.

Love the long format and detailed explanations!

Always look forward to your well thought out posts.

I always look forward to your videos and am never disappointed when they drop!

So glad to see another vid. These guys are incredible.

Grateful for a new video and what a great one at that.

You guys are having WAY too much fun! Thanks for bringing us along on your journey.

Love, love, love this channel! This is why the internet is brill...

I love pulse jets. So simple yet so effective. I built on a couple years ago it worked grate untill the reeds failed. Good times. I cant wait to see what you guys have instore. 😊

Thank you for not having sponsors and for sharing the cool things you build or play with. Liked and shared 👍

Aerospace engineer, but admittedly didn’t specialize in propulsion, still I did study it quite a bit. What I can say is that typically aerospace propulsion comes down to momentum coupling, you have a given power generation available in a reactive engine and you need to maximize the useful momentum transfer coming from that, that means balancing massflow and exit velocity. You can have a lot of air moving slow or a little air screaming fast with the same energy. Because of the V^2 vs V scaling of energy and momentum that means you get the most oomph from a larger mass moving slow, but if you’re moving at a certain velocity you have to give *some* impulse or you aren’t really doing anything. It tends to balance so that the exhaust velocity is most efficient at about 2x the forward speed. A turbojet has a really fast exhaust, so its not very efficient for most aircraft, instead we use bypass air and extract more energy from the turbine to run the fan of a turbofan to push lots of air at the right speed to maximize efficiency. Then for big slow aircraft we go straight to a turboshaft engine and run a huge propeller so something like 80x the air is getting pushed on by the screw than runs through the engine, and at the limit we have helicopters where they can be more or less efficient while static. Getting on to pulsejets, they run off of an explosion meaning they have a brief pulse of high velocity output, but they usually run on slow moving or static frames. An augmenter better couples the momentum of that impulse by entraining a larger massflow and distributing that pulse over a longer time, you get a bigger smoother push instead of sharp taps. Meanwhile a small turbojet, while it does have a fast exhaust and lower massflow, the internal flow velocity usually assumes mach 0 behavior and it’s nothing crazy, ~mach 1 for a hot gas. Using an augmenter here is similar to a really inefficient implementation of bypass air in a turbofan, i wouldn’t be surprised to see it working, but i also can see why it wouldn’t be especially effective in comparison to the pulsejet

What an excellent video. Thank you for the hard work and cool content.

Outstanding what you do. Keep on!

Love the channel and your content, keep up the good work!

Thanks for the work guys.

Missed you guys, love your content.

Oh, I was waiting for these guys

Thank you for doing all that you guys do. Very entertaining and enlightening. Love the broad range of subjects that you guys get into.

the content you produce is always absolutely top notch. amazing technical detail.

Welcome back to your channel! Missed you.

It has been a while since you did a video. Glad you see you're back at it!

Love your honesty, integrity and dedication to educational and scientific content. Please keep doing what you're doing.

Been a sub for years, thrilled with your content, and especially thrilled about your million subs proximity. Keep up the great work!

WOOOOT lets go welcome back!!

Excellent and very interesting as always - thanks!

Just when I thought that I haven't seen any video's from your channel for such a long time, there is a new one! Thank you!

Great content as always!

woah, caught this before even a minute passed

Nothing sounds better than a turbine spooling. Magnificent !

I love it when we get a new Tech ingredients videoooooooo keep 'em coming please

Thanks for the content, guys.

since the air inside it drags, is there some internal design that can work similar to the dimples in a golf ball? maybe many rings for vortexes to form in place to reduce friction with the exhaust from engine?

YES!

Great job, I can't wait to see what's next ❤

Amazing as always

It's funny, but one thing I really enjoy about your videos is your approach to safety. I've actually tried to model some of my own safety procedures off of yours. Like try and think of the worst possible thing that could theoretically happen and have everything you need to mitigate a big problem like that. And then if you only have a little problem, you're over prepared.

It's the same type of device they use to inflate aircraft emergency slides. Instead of a jet engine though it uses a small rocket motor.

Thanks for posting. I very much enjoyed it.

It's easy to visualise exactly what's happening thanks to the casual competance you convey in your explanations.

Unlike others on UKposts with similar engines, I'm glad to see proper hearing protection used!

I love your channel and can't wait to see you hitting the million subscribers. You earned it!

Continue to be in total admiration of your dedication to things experimental. As usual excellent dialog explaining processes. Very glad the channel is doing so well - I well remember your really early output and here you are getting ever closer to 1M subs! Thank you.

One of the best channels on UKposts. Thank you for sharing these experiments with us!

Love the way you explain stuff! This channel is awesome!!!!!

What can I say .... Amazing video, amazing explanation and really looking forward for the next video ! Great job !

Great well thought out experiments and tests. Love the channel.

Thanks for your videos guys never gets boring you are always thinking up something new.

Appreciate the amount of work and impressive entertainment value of this channel.

I can't tell you how excited I get when I realize you've posted a new video and how much I enjoy watching it! Thank you!!!!

Definitely one of my favorite UKposts channels. Keep up the good work, fellas. Subscribed. (Retired electrohydraulic servovalve guy).

Another fascinating deep-dive, thanks guys!

It's been a long time since I found a youtube video fascinating and engaging enough to sit through 40 minutes without a single pause. This was incredible.

Nice! Thank you for dedicating more time to things aviation.

Love the channel, keep it up!

Really appreciate the long takes you guys do. Talking nonstop about technical topics over a long period of time without a cut is super hard. Mad respect 👊

I just admire these guys! Great knowledge and hands on experience.

Great video, keep up the awesome work!

Amazing stuff as always

I think your millionth subscriber is not that far away. You deserve all the support you get for your excellent content. You have such outstanding video production standards that the effort is invisible to so many who take it for granted. Well done, and keep growing from strength to strength.

Thank you for your work!!!

Man I love this channel. Always good science.

Educational! Looking forward to the next one.

This was the most comprehensive look at how a jet engine starts I’ve seen. Love it!