WE USED AN AUGMENTER ON OUR PULSE JET! 

"Are those flames normal?" I like that!

It would be awesome!

It would be awsumer at night. (not for the neighbors) 🤣​@@RobertLBarnard

and lets not forget having the BackYard Scientist as the neighbor in the back.... that would be one heluvah colab on Laser Dayz

I disagree. It would be a nightmare. Imagine the neighbor had a baby and it was nap time.

And the smell. Running that thing with a jug of urine for fuel should be rank.

Shatter windows up to a mile away... Ask me how I know.

Just wait ‘til the episode on nuclear fusion

@@PrinceAlhorian how do you know 😅 lol?

@@CraigLandsberg-lk1ep built a proof of concept pulse detonation engine with an engineering mate in university. We struggled to get the stochiometric values correct and when we finally did the detonation was loud enough to shatter windows, farthest crack away was about a kilometre.

Thanks.

​@@TechIngredientsYou should try an adjustable augmentor

"The Performance Spiral". ........get it?

( hi Bruce - good to see the experts in field are on the sidelines too..) Also for mounting in an aircraft - the sleeve of an augmenter assists in radiative shielding. those tailpipes get "roasting".

@@user-ij3me4vu4s 🔶🔶🔶Precisely. and then some. As with all rocket/jet engines and ducted systems, geometry/topology is crucial. I have an idea for better augmenters and a more powerful jet/rocket engines. 🔶🔶🔶

Agreed Alex was correct, any force great enough to send the boat up the ramp would just cause the chocks to slide. Those chocks really want to skid on smooth concrete.

The weight of the boat has to be on the chocks to prevent them from sliding.

@@landroveraddict2457 Then why do they exist? If the engine had created enough thrust, it would have towed the boat up the ramp. What they should have done was use actual chocks.

This needs to be the next experiment to settle this once and for all!

@@mitch5297 No. Go on the internet and look up a wedge shaped door stop. Done.

A "ring" fan would probably not produce enough air-flow for the augmenter to do it's work in a static firing. You'd need something like a wind-tunnel to test the augmenter.

@@meatybtz I was talking about the snail fans to dry floors, but you're definitely right, it's less than Ideal, but it would be interesting to see if there was any improvement and it would only cost 100$. I don't know how much it costs to rent a wind tunnel.

​@@spamviking8591.........all of it $$$$$$$$$$ 😁

I had this thought too -- that a static test might not allow the augmenter to work as intended. Not that I've read any literature, but if there's a gap, there could be airflow through it. A static test might get some entrainment, but that could be fiddly to fine-tune.

@@spamviking8591 Snail fans setup on a rig, say, three to create even flow across the booster? You know.. that MIGHT actually work.

Well said!

Somebody didn't learn physics in school

That's a good idea.

I agree, or use a 1000 IBC filled with water, when empty two people can easily lift and move it around, water is heavy, 1kg per litre will make and IBC 1 metric tonne when fully filled.

@@TechIngredients At my company we used interlocking concrete blocks as weights to test our equipment. We had them in 400 kg and 800 kg sizes. But they are produced in many shapes and with different features. You can drill on them to install anchor bolts. They are super cheap. You pay essentially for the transport to your premises. You can store them over a wooden pallet and use a manual pallet jack to move them around. I'm assuming you already have the pallet jack. If not, maybe is not an optimal solution.

@@Darkralos Same thing as street bollards/Jersey barriers.

@@TechIngredients If you make a tank instead of a bladder, you could also plumb it as a heat sink for water cooled projects.

Ha!

My grandmother used to live in Polincove, in Northern France, during the war. If you draw a straight line between London and Éperlecques (which is the main site from where the Germans would launch V1 missiles to England), the small village is just under it. One day, she was playing just next to the church, when a V1 flew away from the blockhaus. She was used to them so didn't care that much. But this one misfired and nearly crashed into the steeple. It would of course have killed her, and I wouldn't be there to tell you that story.

Probably. My grandma was a young teen during the Blitzkreig, in Dover. There's a heatmap somewhere that marks where all the shells landed (make sure to zoom) but unsure if she ever mentioned pulsejets. Same thing with fireworks.

Exactly.

Well if it only works when stationary what's the point of it in the first place ? its a form of propulsion

@@andymouse It isn't just when it is stationary, but the point is trading speed for power. It is the same thing as the lower gears on your car's transmission.

@@barongerhardt (Top) speed for *thrust*. Since an augmentor doesn't introduce extra energy it can't increase the (maximum) power output of a jet engine (setting aside that a stationary jet engine techically doesn't produce any power at all, no matter how high the thrust).

It has to move

Absolutely, your son was right or did you argue with him to tickel him a bit more!

Oh yeah! I never would have noticed that, lol.

I think your intuition is good. This probably explains why we don't see these things very often.

The boat was overkill. The gauge read around 200N, that is only around 40 pounds of force. 80, if the augmenter double it. As you said sandbags, a parked car, or leaving the trailer sideways would have been plenty.

yes... in its basic form it cant work. the air being accelerated through the duct is not being worked upon directly. only the air flowing through the jet itself is worked upon, is accelerated, and can produce a "reaction" upon the combustion chamber... once its left the jet, that gas and what it interacts with has no bearing on the reaction forces produced. you dont push on the air behind you. it simply gets in the way and reduces efflux velocity... backpressure!. rockets work better in a vacuum... you might drag more air through the system, but it isnt producing a corresponding reaction. thats fixed by the pressure differential across the nozzle. but... if one takes the ram air principle, air stagnates in a converging duct so adds its momentum to the static pressure, then takes that high pressure air, heats it with radiant/conducted heat, allows it to expand in a chamber then escape from a nozzle... at either atmospheric or lower... its basically just added another "pulse jet" to the outside of the thing. the imbalance of pressure causing air to flow out of the nozzle has something other than just the incoming air to act upon. the inside of the heating chamber. and that is attached to the jet and the aircraft... air go one way, plane go the other. picture it another way. *lights cigarette* wave your hand through a cloud of smoke. the resistance you feel, the work you do, is to simply displace the air in front of your hand. the swirls and eddies and large "slipstream" following, that is simply air you worked upon and accelerated, losing energy to the surrounding atmosphere. it may impact molecules and cause a greater mass flow in a general direction, but the work applied to that mass is still the same total, the amount applied by your waving hand... simple air entrainment does nothing but add drag. ah, the name just came to me! "meredith effect". using the cooling system to add thrust to certain fighter planes. precursor to the pulse jet! i also picture an annular type affair... feed the exhaust gas OVER a central cone... and the entrained air is ejected inside the efflux, that automatically being a low pressure zone... the incoming high speed air is first rammed through a choke point, then allowed to expand, slow down, increase pressure inside the duct... then "sucked" out the nozzle. ideally, with excess heat still being added during the expansion phase. if i was better on CAD i could wack something up in half a day... *spends the next 3 months...*

The silly and awesome is the key. Remember, "ET phone home?" The physics at CERN is fascinating, but remote. You watch it from the sidelines. Here, you see the principles in the stuff all around you, but you can also participate.

+1 for aerospike those things are fascinating and as Mr. Ingredients said remote. Hard to find much information or video of them in action.

lmao

I more about electrons than gas flow - but that occurred to me as well; perhaps the entire air column/sheath around the engine must be moving at the speeds of flight, and not just the reed valve intake air.

@@zinckensteel maybe a makeshift wind tunnel?

Any details? I just finished the one we'll be using, which is based on an overdriven coil and an inductive collapse (spike). But, I'm always looking for better ideas.

@@TechIngredients We designed a high energy transient plasma ignition system. If my memory is correct, they wanted to promote generation of OH radicals during the combustion process. This would allow for an easier restart in case of a flameout, however I was only in involved in the electronics. The ignition system used diodes operating in a "Drift Step Recovery" mode which are capable of generating an extremely rapid turn off times (~1 to 2ns) at several kilovolts. This was pumped into an saturable reactor (inductor) for generating a very high voltage output pulses ~60kV at a 10kHz rate! Here is the SBIR document: www.sbir.gov/node/258006. There should be some technical papers that were published by "Andy" Andras Kuthi PhD from USC. Here are some papers related to the project: arc.aiaa.org/doi/epdf/10.2514/6.2007-443, ieeexplore.ieee.org/abstract/document/4743608 and www.proquest.com/openview/cfa64ab6f74cdacae85ea66093561d29/1?pq-origsite=gscholar&cbl=18750. Here are two papers unrelated to my work: shepherd.caltech.edu/EDL/publications/reprints/galcit_fm2005.002.pdf and arc.uta.edu/publications/td_files/PKP-Dissertation.pdf. Hope this helps, Jay. analogdesign ### cox.net (substitute the ### with @)

@@TechIngredients I tried to post some info with links however RU-vid removed it. Is there a way that I can communicate with you? Thanks, Jay

It's not a ramjet, nor is it a rocket. There's 2 problems - the augmentor is too small, and it's far too close.

It is better to over build rather than under build when it comes to safety.

@@TechIngredients that is very true

A few other viewers have recommended I look into it. The basic premise doesn't make sense to me. Weather patterns involve a lot of damping, so the energy needed to drive it (or modify it) will have to be VERY large to compensate for losses.

Me either. It may be that the augmentor interferes with the reverse flow part of the pulse jet cycle.