LETS BUILD A BIG LOUD NO MESSING PULSE JET
So lets get straight to the point as a good portion of you might just be here to get the dimensions design etc......
ANYONE CAN MAKE THESE
Now i do mean that as you dont need many tools to make these, just a welder (Tig not nessasary mig will be fine) and an angle grinder hammer and drill. Most practical people that can cordinate there arms n hands in the ways needed will have most of them already with the welder being the odd one out but you can borrow one hehe. So might be a good idea to watch the video below then i'll goo through some bits after. SHABBA
Ok so you have an idea of what its about now. This is a fairly big pulse jet as ive looked around the net and have seen ones around this size but not many and mostly with crap pictures and boring videos and i can tell you now thats not going to be the case here. The basic design for this was taken of the net and originally came from an australian called bruce simpson who seems to be the main man in pulse jet design so i thank him for shareing his knowledge. The first thing you have to get is your bends as they will determine the dimensions for the rest of the jet and as the ones i got were bigger than the ones in the original drawing you have to scale up all measurements the same amount. for example if i have a bend with diametre of 86mm and the drawings is 72mm then divide 86 by 72 and this will be the figure in wich you times all other dimensions on drawing by. That for some maybe obvious but just incase. So you got your bends now you need some sheet, its best to use staimless as it can take more heat but you can use steel it will just flake n fail alot sooner and if you run it hot hot will prob burst but depends on whats around, mine was made from a catering table and was 1.6mm thick which means it will last forever but was a bitch to bend n get the cones. The bending procces of corse is easyer with a sheet metal roller but these are not cheap so i struggled with welding bars on edges and getting mad with it, it took all day to do the massive long cone and looks like a cars ran into it but i can tell you it all works out just fine. The lastthing which is not in the video is the fuel rail which is a 15mm piece of tube with 3mm holes drilled down its length and put across the centre of the inlet in the fisrt cone of the big fat bit (combustion chamber) OK now all we need to do is test it.
THE FIRST TEST
So of to the airfield to test it. Now i have a little knowledge now of starting jets from the jettle i made and a few other smaller ones i made too so this did help in knowing if your over gassing it etc but this big one is the easiest of them all to start as you don't even need a spark plug to start it just a match or blowtorch to light the gas as it comes out jet. We know this because as you have seen in video the sparker broke and not wanting to go home continued on to find it wasn't needed.
Now we first started it on floor on gas gas with nothing other than tool boxes and whatever heavy stuff i had in van which is were my approach is instantly different to all others ive ever seen as most people build frames and lock them down on concrete blocks but we built this thing to move so why clamp it down hahaha.
Running of gas gas it does not make enough thrust to move its own weight but turn bottle upside down so it runs on liquid and it wants to go n this got my well excited so i tried to walk it up runway like a dog but when on liquid the slightest touch of the gas valve makes big difference and thats what pete was trying to tell me in video but i couldn't hear him.
Starting it on liquid gas from cold is harder and i find pre heating it slightly on gas will make your life easier. Also the solenoid valve i had set up which on the video said didn't work did work but the throttle range on gas was so small it made little difference and on liquid froze up and didn't work. bummer.
So now lets chain it up in van and stand infront of it.
Now we first started it on floor on gas gas with nothing other than tool boxes and whatever heavy stuff i had in van which is were my approach is instantly different to all others ive ever seen as most people build frames and lock them down on concrete blocks but we built this thing to move so why clamp it down hahaha.
Running of gas gas it does not make enough thrust to move its own weight but turn bottle upside down so it runs on liquid and it wants to go n this got my well excited so i tried to walk it up runway like a dog but when on liquid the slightest touch of the gas valve makes big difference and thats what pete was trying to tell me in video but i couldn't hear him.
Starting it on liquid gas from cold is harder and i find pre heating it slightly on gas will make your life easier. Also the solenoid valve i had set up which on the video said didn't work did work but the throttle range on gas was so small it made little difference and on liquid froze up and didn't work. bummer.
So now lets chain it up in van and stand infront of it.
HELL YEAH
PICS FROM SLDIGITAL. CLICK HERE TO SEE HIS SITE
Well what a pair of Tw@s your probably thinking and you could be right but this was a hell of a day with every comedy fault thrown in and it made a video which shows how we roll. So if you want planed chaos then we are right there.
The 8" of chain i thought would be enough to not melt the straps only for me to forget the big flame you get on start up, then we had the packet the extra chain came in catch fire only for that to look small compared to the near torching of the van after santa got involved. The point to the wood was to see if the jet could get enough air into itself with the door shut as driving around with that blasting away would make most boy racer sound systems sound like a phone but the threat of if it did cut out the van would be filled with fire and lots of it kinda made it a step to far but may et revisited in the future.
What did we learn from all this dicking about is liquid gas makes it hot fast and probably 80% more powerful so now of corse we should strap it to something and get moving which i think requires a new page on my site to do it justice. Click here after thursday the 30th of may to see.
The 8" of chain i thought would be enough to not melt the straps only for me to forget the big flame you get on start up, then we had the packet the extra chain came in catch fire only for that to look small compared to the near torching of the van after santa got involved. The point to the wood was to see if the jet could get enough air into itself with the door shut as driving around with that blasting away would make most boy racer sound systems sound like a phone but the threat of if it did cut out the van would be filled with fire and lots of it kinda made it a step to far but may et revisited in the future.
What did we learn from all this dicking about is liquid gas makes it hot fast and probably 80% more powerful so now of corse we should strap it to something and get moving which i think requires a new page on my site to do it justice. Click here after thursday the 30th of may to see.