Thanks, I was wondering how a pulse jet works, but that mosquito buzzing around made me really itchy!!! Haha Thanks again.

Wow! That thing gets red hot in no time. Your voice lowers my heart rate :) You'd make a good professor.

Very nice design. It's surprising how quickly that thing turns bright red. Nice video. :)

Nice explanation. I remember seeing ads for these in Popular Mechanics 40 years ago. Thanks for posting.

Thanks, I really appreciated your explanation as I had no idea how this thing works. I'm not an engineer, but I love watching this stuff (kind of like people who don't know martial arts like to watch it in the movie and appreciate it).

Hells Teeth that is truly AWESOME ... nice explanation of an extraordinary technology. Something so staggeringly simple can produce such power! Excellent post.

Gave a satisfying amount of detail.

Always wanted to know how they worked / were put together. Excellent vid!

this is all meant to be. I feel peaceful now.

Awesome video thank you sir!! just got me one of these to fix for a friend. its an intercontinental venture sort of thing. can't wait to fix it and kick in the gut!

Awesome mate. That thing has quite the sound to it!

I have never heard one of these engines in person, but just the resonance that it makes in the distance sure tells me that, D**N that has got to be loud.

That's a beautiful bit of kit man, I'm so jealous!

Wow very cool. Clean looking too. I remmeber about 20 years ago or so I found an add in magazine how to build your own Pulse Jett. They would send plans how to build using an aerosol can and some thin metal. 2 different thrust versions the big one sold for $12 so my buddy and I bought that one. Weeks later in came in mail and the plans looked like a kid drew them by hand LOL. We looked it over and gave it a shot no luck. After seeing this video now there is no way we could have got it to work.

Totally an aviation nut myself! Dis guy right here always watch the plane video from here with my rock playlist crancked to 11. Metallica, Delta Parole, ACDC etc. AWESOME!

Don't let the whiners get you down. I greatly appreciated this video, finding it informative and thorough. Was fun to learn about dynajet pulse engines! Chris Shaker

Love hearing the reverberation in the background when you shut the engine down.

Yep, watching the fuel still left in the fuel line get sucked into the engine looks really cool :)

Thirsty little blighter. Nicely made unit, thanks for the explanation, very informative. Regards from the UK.

Darn interesting. This answered my questions about the engine type. Thanks.

Nothing to apologize for - great video!!

Ha I love the decay on the sound when its switched off!!! your neighbours in the next town must love you hehe

Yes that is why I have focused mostly on advancing valveless engines, they are superior to valved engines in many ways.

that's a beautifully designed engine, great video... screw instant gratification.

Thanks for the very informative video.

Super pulsoréacteur, it's a beautiful works, i make one like this, but with only 1,25kg of thrust and i think that the starting was difficult for my pulso. (my english is not good) Thanks for your vidéo

Thanks for showing how it works :) !

Nice!! I have a folder full of plans to build these things but somehow I never did. Maybe I should give it a go. They seem like lot's of fun.

heh thanks, the echo is even better in person, the mic doesnt pick up the trailing end very well, as its still trying to adjust from previously recording super loud.

That looks soooo much nicer than the home made ones

Be sweet to see someone make a V-1 kit to use the engine

Great video! Thanks for sharing.

This engine was actually an engine made in the 1970's. I have made many many similar engines, but you need at least a lathe and drill press to make the components.

@2manycatsforadime

4 жыл бұрын

they made these way back. I remember late 50s having a redhead. We would start it with a bicycle pump. Yes the daisy pedal valve would not last long.

awesome echo, love this

WOW that thing heats up quick!!

that echo in the end is sick

thanks for the explanation. Awesome toy you have there

wow, that was actually very interesting, thanks

That echo at the enda is just sooo eargasmic, i'll try to copy that sound in Fl Studio and see how it works out =P It should be my ringtone on my cell!

@falgunighosh585

3 жыл бұрын

Where I can buy this engine?

AWSOME ECO SOUND AT THE END! :D

DAMN that's soo cool. looks like has much power then a valveless kind

I rather enjoyed the flat, smooth narration, quite informative

I have a question: pressurized gas tank or no? It appears you are spraying some igniter fluid into the jet to start it, but the vacuum effect is pulling the gas from what appears to be a coke can.

Aluminum will melt in about 3 seconds, the small ones run just about as hot. The dynajet has a power to weight ratio of about 4.5:1, weighs 1 lb produces 4.5 lbs.

In the 50s my uncle had one of these on a control-line model V1 buzz bomb. He had to whirl like a dervish to keep in under control and it was so loud it scared me, I was about nine years old.

They are more for weight reduction while looking cool, they provide almost no cooling, if they ran lengthwise then they would provide cooling as the engine moved through the air. Methanol as a fuel source provides the most cooling, actually causing ice to form on the intake.

thats one hell of an over view, i just wanted to see the damn thing run!!!

It serves both purposes. cutting the slits reduces the mass (weight) but doubles or triples the surface area in which heat can be radiated from.

I seem to remember some big rant about how a plane at 275 = 0 power, and that the plane is 500 times lighter and 500 times more aerodynamic, and that it was an unfair comparison because cars have wheel friction, and a bunch of other stuff. I looked up the veyrons MPG at top speed, it gets 2 miles per gallon at 250 mph. At 275 mph a plane with this engine would get 180 miles per gallon. 275 is low, an advanced system could potentially reach 600, where it would have ~300 mpg.

Perfect video...very informative. Question: It seems that the nozzle and combustion chamber get extremely hot....can you really fly more than 2-3 minutes?

Nice Trumpet.

One of my friends actually built a dynajet style valved engine from an old torch! (It had steel casing so it could withstand the heat)

You are right that echo was cool !!

The cuts are not made in the direction air would be flowing, little to no air will flow through the cuts, making them almost useless for cooling. They do however keep the same aerodynamic profile, while reducing the weight dramatically, and also looking cool.

Fantastic !

A little bit, mostly they are a decorative way of reducing the weight. If you run the engine off of methanol the evaporative cooling from the methanol vaporizing will actually cause ice to form on the valve head from condensing and freezing the humidity out of the air flowing past. With gasoline or oil based fuels though the valve head will get hot enough to melt your finger prints off. For static running I suggest either alcohol or a mix to provide some cooling.

In RC models, it appears they aren't using pressurized gas-what would recommend? It is safe to use a pressurized tank of a couple hundred lbs psi when burning fuels like gas?

dang. those things heat up and brighten FAST. i havent heard of these until today, but they seem like fun toys(: id like to see somebody put twin pulsejets on one of those plastic drivable electric cars that they make for kids. ahahah

thats awesome, and quite loud

Here we have Animals & Nature and a Pulsejet engine, the perfect image of Mother Earth :)

@AmazingMrWonderful Well, gentlemen, this may be called Dyna-Jet, but it is originally a "Schmidt-Argus Rohr", the engine which drove the V1 (Buzz-Bomb)... actually quite efficient for its 'ancient' design.

and the echo is awesome!

Yea I know a number of people in CA who have dynajets... They are loud and you should always wear ear plugs and ear muffs when doing anything loud. With all the loud noise I am exposed to I dont even use shop tools without my handy swiss 34 dB artillery gunner ear muffs.

good video.

As long as you dont run hot fuels like gasoline statically for a long time it lasts forever, the valves themselves last up to about 30 minutes.

thinking of this i think the Lennox Pulse furnace works a bit on the same principle as this engine but instead of using the pressure of escaping gas to obtain thrust this is used to push these gases through a series of heat exchangers to a point that a lot of the gases condense back to water [ the water vapor part] and out a plastic pipe the combustion chamber on sucht a furnace glows red hot when running like this engine these furnaces achieve 90 percent plus effiencency

The reed valves look remarkably like those used on Evinrude and Johnson 2 stroke outboard motors from the 40's to the early 80's on the smaller capacity engines 40 hp and smaller.they are in the intake manifold right behind the carb.

The echo was awesome.

maravilloso gracias

BIG SURPRISE ! THE BIG FLY NOISE ! :) try with HHO YES !

Holly, that is a ton of heat and friction to get it to the point of turning smelting red.

I had a 3-foot lenticular aircraft with two of them on it, and you should have heard them resonate! You could hear it for miles. (Control line like to tore my shoulder out.)

That's pretty cool

4.5 lbs thrust uses about 125 ml of fuel per minute, which seems like a lot, unless you are going 300 mph.

"we do not advocate or condone burning your finger prints off to avoid criminal prosecution" LoL

Oh my word! That echo! Do you live in the Alps? :o) The info about the loud crickets made me smile. I also was amazed on how hot that exhaust became almost instantly! Thanks for sharing this video.

Very nice thanks!

Excellent block of instruction. I hope to duplicate Aardvark of New Zealand's coffe cup no-weld pulse jet, fuel with Santiili carbon arc rod plasma generated HHO, and start with welding or medical grade oxygen. I hope to make a valveless Pulse Jet with in-line venturi. Thank you for your instruction.

@pcblah Harmonics matter everything, and they're adressed in the dimensions of the motor. Build it right and it'll fire and run right.

Hello thanks for showing us.. just wondering do you need a fuel pump for the pulse jet ? and also can you control the thrust of it ? Thanks

yes, for starting you can use a spark plug, once it is running it doesnt need a spark.

Hi my name is Chris I like your video

So how do the spring steel of the valves withstand the high temperature in the chamber without loosing tampering? Or the incoming air cools it sufficiently?

Great video I like to get one of those for a CL pulsejet model I saw one of those on youtube recently and that model with that engine sounded like an angry honeybee

The short life of the valve doesn't matter if it will just get from Penemunde to London, right?

@BeckTechnologies They don't need to cool the engine, they just need to keep the heat of combustion away from the fuel intake to prevent auto-ignition. If you were to fill those fins in with aluminum it would indeed start to melt.

gr8 vid....

Awesome !!

Excellent job Beck! whats the advantage of using stainlees steel over regular mild steel? is it due to the high temparatures?thanks.

@BeckTechnologies hey i have a question... im making one of these and do harmonics matter? also where do you put fuel injector? (that is all i need to know)

Exactly, they aren't about weight, they are meant to increase surface area and subsequent cooling.

The neighbors are not going to like that.... awesome sound...!

Well done. That is a clean set up. Thrust #'s?

those crickets really evolved

If you run a venturi around the outside to cool the intake, it will add lifespan and efficiency along with trust.

@backcountry600 The fins do not cool the engine. If you run it statically with pure gasoline the aluminum parts can actually melt. They are for appearance and weight reduction only

how much thrust you get? and does the tube melt if you run it too long? it was glowing yellow!

@BeckTechnologies Thanx For Pointing me in the right direction I was speculating! Do you have to pre-heat the fuel? Guess it depends on the fuel you want to run will this design run any fuel type?

They arent exactly cheap, and if you make them yourself they are quite a bit of work to make, after you have to make a few replacement valves you really appreciate valveless engines.

question, if a throttle body was hooked up to the valve system , will it regulate the amount of gas and air flowing into the chamber(quicker or slower) or will the flow always be constant?