How to make reedvalves for pulsejet engines
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- Опубликовано: 29 мар 2010
- This is a simple way to make spring-steel reed valves for valved pulsejet engines like those found on model aircraft. All you need is a suitable piece of spring-steel, some paint, salt, water, a 12V battery or charger and a couple of bulbs.
Who would have thought that electrochemical etching could be so easy or effective?
Check out the XJet channel for more pulsejet action. 
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1 video in 12 years and still going strong. Genius.
rcmodelreviews or xjet , his other channels
That is one of the most clever DIY fabrication methods I've seen for copying an otherwise expensive part.
Thank you sir ...😻
Wow I'm working on a pulse jet for my college project, and this is a gold mine after searching for a month on youtube about pulse jet,
Can't believe this video came to my use after 11 years
About time. Thank you for this.
in before "I don't need valves on my pulse jet because I don't care about thrust or efficiency, I just want to make a loud noise."
Very clever. This technique has many uses apart from valves. Thanks for sharing!
First video I've seen in a while that actually blew my mind.
Very clever to use etching to produce these. I just ordered a pulse jet engine and will be having fun mounting it on various RCs :)
Clever! 5 min and i learnt something new
Peter Smit
I am totally impressed. This opens a whole new world of fabrication for me. Thank you! JB
After being subscribed for years on the #RCModelReviews and the XJET channel I am glad I've found this channel too.
This etching technique is brilliant easy and cheap, thanks for sharing.
I just have to point out just how transformative and absolutely genius this technique is. Thank you so much for showing me something that will be useful in countless ways. I won’t need to waste money on paying someone to cut or me buy a laser-cutter or CNC. 🙏🏽
Simple and yet messy. I love it! Beats the crap out of ferric chloride and PCB boards.
Thank you for this excellent video. I make Tesla type turbines. I needed a way to make the disks easily. This beats all my speculative ideas hands down. I had thought of using plasma cutters, dies, lathes, mills, drills. Yeesh! This is fantastic and the detail is precisely faithful to the pattern Thank you for this excellent method discourse.
John Mahler
No words to describe how helpful of a tip that was, thank you very much indeed
You sir have just enlightened my mind into a whole new world of possibilities!
One of the most informative and excellently narrated videos I've ever come across! Keep it the work!
You've recruited another subscriber!
What a blast from the past this is!
I made my first and only pulse jet 40 years ago, worked well until I bent it.
Electro etching was and still is a good cheap method of producing fiddly parts.
I also used to stencil etch markings on panels of projects and bespoke builds.
Was easier than going to the engravers - well cheaper anyway.
Copper: No electrolysis, bath is 1 part of 30% HCl, 1part of 30% H2O2, 3parts of water
or
FeCl3 dissolved in distilled water (saturated solution at room temperature), for use heated up to ~40degC by putting the etching pot into a bath of hot tap water (make sure the tap water does not mix into the etching solution). The FeCl3 based bath is reusable.
Aluminum: HCL+H2O2 as for copper, but more water (the reaction is faster, so to avoid overheating)
Do all that in well ventilated areas!
dude you are a genius.. i wish i could stay with you and learn!
That was absolutely ingenious! Love it!
Wow, what a pecision method to manipulate metal! Excellent video too, Thank You Sir.
What a brilliant idea! Thank you for posting!
Thank you. I'm wanting to make replacement valves for my compressor. They are no longer available. You guys are very smart. Frank.
Thats a beautiful method for making metal parts, thanks!!
I just pulled my pettal valves out of the solution after following this guy STEP BY STEP. when I pulled them out after only 15 hours (instead of the suggested 20, just to check on them) I found that they were already completly etched all the way through. In fact they were "over etched." the sides were completely jagged and the center hole was enlarged sizably. the only thing I think that i might have done different was use two 13 watt bulbs instead of two 5 watt bulbs.
You sir, are brilliant. Like Lefty said the possibilities are endless!
Amazing! I'm going to try this right now. Not to make a reed valve but something for sure.
Very ingenious, thank you for sharing.
this is a genius way of making perfection parts thanks for showing this i can use this technique on a lot of other parts for lots of my other hobbies as well.
I was looking for a way to make a planar spring for a free piston Stirling engine and this is the perfect way! Thanks! Only thing left is to find spring steel now...
Thank you for being very specific in your instructions. I tried this method several times in the past and the paint lifted at the edges of the scribed lines resulting in failure. I was not using etching primer. I will have a go with etching primer and the 2 bulb circuitry. Thank you so much for you video!
Excellent video, Bruce!
Thank you.
That's great, simple and all you need is a DC to DC inverter in which you can adjust the voltage and current.
This is amazing, I'd never thought of doing that very clever
Outstanding video just for the content on electrochemical etching alone. Good job and well done, thanks for posting. :)
if only all youtube videos were so instructive and useful! Good work indeed. Many thnaks for sharing
I love your work shop Bruce.
Excellent video... the educational ones are in my opinion the best. Thank you.
Ultra level metal cutting technique
god bless you for this teaching video it is really useful for many projects
Great stuff Larry!
Thank you Larry! Some new technick for me! Interresting and good stuff!
An easier, albeit more time consuming method of removing the the oxide, is to submerge the steel sheet in a pickling solution (weak acid). The easiest solution, is straight white vinegar. Great video, and a wonderful demonstration!
Won't that take a couple or three weeks to etch though?
He's talking about just to clean the steel. To take that thin oxide layer off would only be like a day.
Incredible!
I had read that the metal of the valves is a special alloy to resist the high temperatures.
What an awesome way to "cut" metal! Thanks!
Impressive! Thank you.
excellent! nice videos and really clear speech, hugs from argentina!
Excellent skills, thanks for the vid!
That's great. Before I saw all the video I was wondering how I would dispose of the acid but when I saw that it was salt water used as an electrolytic this was great. I can use this to etch so many other things I absolute safety.
That's a very useful little idea I can think of some useful things to use that for on engines
Great and informative jd
Awesome Video! People helping people! Thanks!
That was awesome, I have no use for it but it was still worth watching.
All right !!!!
Cool as hell, many many thanks for a great video.
That is really cool!
thank you for a wonderful idea and money saver.
Thanks! Very helpful!
Good tutorial.
10 man points for this video . simple but executive.
Thank you for your help
That makes sense, I've never tried to "cut" anything like that, I didn't even know it was possible. Yes, when I leave the charger on for over an hour, the bubbling does get pretty violent, plus the solution gets pretty hot.
Really amazing. Thank you for sharing this technique, it will be very useful in further projects to me
Thank you for explanation
This guy is awesome, great video, great information!
Very cool and informative.
Well I must say that was an education. I'm about to buy some reed valves from Hobbyking. And then it starts. All dimensions for a pulse jet will be taken off those valves. They're as cheap as chips and save me my preferred method of laser cutting. This is, as usual with me, a string-shoe approach, having no coin to speak of. Half the fun is building something with nothing...
Now I've seen your method, it's certainly something to bear in mind for the future. Many thanks for sharing....
That is awesome,as always! Think I'm gonna try it to make me some HHO cell plates!
Careful, that mix of gases (H2 and O) is highly dangerous, if you have any sparks or sources of ignition. The energy it releases to revert back to water is about the amount which you have to put in to break down the water. But it happens in a very short time instead of the minutes, hours or days taken to produce the gases. It's also noisy and very hot.
Awesome! I need to try this!
That was a great video. Thank you for this.
That is absolutely brilliant...........
Liked. I had a think while watching, a cheap laser engraver made from DVD-R drive bits might work wonders with the black paint (they won't do damn to the metal itself). Just to make it even an easier job.
On the other hand, small plasma cutters are cheap as dirt these days. I got mine with built in compressor for a grand Canadian. With how clean of a cut, the fact that it cuts pretty much anything (I swear it'll cut dirt if you don't mind eating tips using the internal start mode) and how cheap it is per cut, they're just SOOO good. I hear ya about the laser diode stuff though. I have a 1/4 watt unit I use for engraving and it'll mark metals with black paint, but just barely and you can pretty much rub it off with a finger.
Oh, I didn't mean cutting the metal directly, but to make etching patterns using black paint as electrolyte barrier.
Ah, I gotcha. :)
super erkärung, danke!
Amigo gracias por compartir saludos desde México!!!!!
thank you for this very instructive vid!
Muy interesante, gracias por bañarnos con buenas ideas. Muy didáctica la explicación. Se agradece la buena disposición del genio del video.
That would be a good method for making intake reeds for old 2-stroke stationary engines, like the Petter 'M' series etc., and crank-case valves for some of the big old Lister 4-stroke singles.
Great video... I cannot wait to make my first PJ
you are a very smart man and i do like your work .
Great to know that my hho generator can etch out parts for me. It seems obvious in retrospect, but I just never thought of it. Thanks!
Very interesting solution
Now that was clever,,,,and simple.
Very impressive!!! Thanks
I have used that process before, it is very easy and safe. Your video quality is very good, just wish you would slow down the audio at the beginning, I am hard of hearing and when people talk fast I have a problem. Thanks for the idea.
Really cool
Thank you
I was checking for "Blue Tempered Spring Steel".006 thick 1095 grade . Fastenal sells a 6.0" X 50" piece of Precision brand material for $35.00. A guy on ebay sells them for about $9.00 each. You could make several for $9.00.
McMaster-Carr has it for $18.00. 6.0" X 50". You can also get a .050" or Like I did get a 0.100" thick 304 Stainless Steel plate. HobbyKing has the Reed valves for $1.99 for a pack of 5 reed valves. I ordered 100+ reed vales as I also had $29.00 in HK points. So the price went down more. I am still making my own reed Valves as I have .006", .008", .009", .010", .012" and .015" thick 1095 Spring Steel.
Brilliant bit of creative engineering! plus Australia T-Shirt! :-P
I really enjoyed that.. Haven't got anything i need to cut out of metal right now but by golly I'm going to try this when I do! :D
Fair dinkum cobber...this is knowledge well worth having.
Very good thanx for sharing!!!
Thanks a million!
Thank You for share.
Great Stuff !!
That is Amazing!!!
This will make life a lot easier when doing precise cuts in hardened conductive Plates !!!
Thanks 4 Sharing!!!
You Are The Man !!!
That , is fantastic .
excellent video. Hi from Perth.
Very interesting and very well presented, Thank you for sharing. :)
Brilliant just brilliant !!!
Forgot about etching, since Jr. High School over 40 years ago when a grass hopper jumped thru the window into the pan of etching acid! Turned him into a blob of snot...
In chemistry we are using NaHCO3 (soda). It is cheaper because you have to use much smaller ammounts. But be carful, If you put too much salt or soda, you will get just sparks in water.
thankyou very much. if it is truly a factor of about two and should only take half the time, then that could explain the excessive deterioration of metel. I left them in for 15 hours which apparently would be more like 30 instead of the suggested 20 hours if i were using 5 watt bulbs.