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Apr 28, 2009 15:01:15 GMT
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I'm not sure how to tackle this thread. So far I've got away with not doing it but a few of you have seen my garage and I've been exposed by Grizz so now I have to. There's a lot to go in so I'll keep it in one thread and add it s-l-o-w-l-y as my bandwidth allows  I'll kick off with my jet scooter. I built a large-ish pulsejet as part of my final year project at university. It's made from mild steel pipe and rolled sections with a 2" exhaust. It runs on propane and output is about 15lbs of thrust I think, can't remember. Naturally with a jet in the shed you need a scooter to put it on so I lengthened one of those metal kick scooters and mounted the jet on the back. This is what I ended up with:   Note how there's no throttle and no brake. Power is controlled by winding in the regulator which is about 5 turns from off to 4 bar of gas pressure:  Noisy end where all the fire comes out:  Intake, sucks the hairs off your legs:    And as with most of my toys it folds up and neatly stashes in the corner  How does it go? Well it makes a proper load of noise, glows red hot, there's fire, explosions and a real risk of getting hurt. It doesn't actually go all that fast because it doesn't have a huge amount of thrust for the weight of a person. I have ridden it and slipped off and when the weight is off the deck it tries to fly off. So consider this the mk1 and there's a mk2 in the pipeline with brakes, proper throttle control and somewhere better to stand. And a little more thrust of course Here's a youtube video of some early testing. It's all the footage I have but the jumping camerman who starts to back off when I wind it up gives you an idea how loud it is! Running procedure is sparkplug on, gas on, shoot some air in the front with a leaf blower to start it, turn the sparkplug off and wind the gas up. At the end you see a shower of sparks fly out the front and the motor stops. This is the valves destoying themselves before I had found suitable material for them and I experimented with a tuned valveless intake for indefinite running. Short video here: There, that's not such a bad start, don't know what I was so worried about ;D |
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Last Edit: Jan 8, 2010 15:02:27 GMT by Deleted
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mason
Part of things
Posts: 601
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Apr 28, 2009 15:31:50 GMT
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thats fantastic ;D and to think i felt sorry for my neighbours!!
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Apr 28, 2009 15:48:05 GMT
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The Christmas I first started testing this I had no idea how loud it was going to be. At about 7:30pm I was ready to go  and after a bit of messing around we got it running. Once it stopped there was a shout over the fence from a few doors down: "What the bloody hell is making that noise!!!" "It's a jet" "Oh" And that was that ;D |
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Apr 28, 2009 17:11:06 GMT
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hey thats cool if it don't have enough power just build add another jet to the scooter  could you maybe run a control cable to the handle bars. |
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Apr 28, 2009 18:56:15 GMT
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Nicola and me chuckling like loons here.
Nice one Jonny69.
Nicola says your head is a very dark place, but she likes it.
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Apr 28, 2009 20:33:14 GMT
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Thats awesome! This is the crazy sorta stuff I'd build if I had the materials. Was expecting more flameyness out the jet though. Looks fairly simple though, I mean... Its not rocket science is it? XD Sorry, been wanting to use that. You must show us more creations! |
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The Doctor
Club Retro Rides Member
Posts: 3,449
Club RR Member Number: 48
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Apr 28, 2009 21:32:05 GMT
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haha, this is going to be a cool topic to bookmark! |
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Apr 28, 2009 21:48:22 GMT
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Ever had a go at this in your inventing lab? Looks like it'd be right up your alley...
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"Chasin' the gash, with a four-out-the-dash"
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Apr 28, 2009 23:02:41 GMT
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You're totally insane! I love it!!!  |
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tux
Part of things
Fat Bloke
Posts: 417
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Apr 30, 2009 12:44:02 GMT
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I reckon Jonny69 should change his username to Q !!!! ;D Much awesomeness. |
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joda
Part of things
Posts: 675
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Apr 30, 2009 13:10:46 GMT
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you should do a flat pack kit, so i can buy it and build one of my own!!
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TS
Part of things
Posts: 558
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Apr 30, 2009 20:02:42 GMT
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I want one!
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Next up is this spudmatic gun. I built it on Tuesday so I've got build pictures as well and it's doomed for the Lemans trip to terrorise my camping mates. Just like a normal spudmatic, just bigger and more powerful.  Plan was to make a little reservoir out of steel tube that I can pump up with a bike pump and have a ball valve at the other end to let it all out at once. No fire, reliable and repeatable tried and tested method which I used last week on one of the gags at work, for firing a model Polaris missile. Start with a bit of 75mm tube, this bit is 250mm long:  It needs two endcaps, one with a hole in it. Cut these out with a 1mm blade in the angle grinder, then clean them up with a flap wheel. The hole is cut with a Screwfix holesaw which has lasted just 3 holes in 2mm steel:  (I'm not all pro using engineers blue but the way, the steel I had happened to have it on already) Through that hole is going a brass tank fitting, a common plumbing fitting for 15mm copper pipe:  Fits through the hole like so:  I've drilled a hole in the side so I can squish through a tyre valve that I got from the local tyre place:   This is the only difficult bit for most people, welding the ends on:  The tank fitting needs to be tightened up before the end is welded on so I cranked it up paggin' tight with some PTFE inside, welded in short stitches and cooled in water each time to stop too much heat getting to the brass:  It's assembled with a lever ball valve tap thing, again, another common plumbing part with compression fittings so no tapping or soldering needed:  Testing. The good news is it works pretty well. The pump is a bit rubbish but 40psi sends a 15mm slug of potato clean over the 3 stories of flats in my building. 100psi sends it right over the block adjacent and 160psi (which is pretty much all I can manage with all my weight on the pump) goes about 75 metres down the road with a bit of recoil. I'm chuffed, first toy for the camping trip in June is complete. Better stock up on potatoes Have a video: |
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Last Edit: Jan 8, 2010 15:03:54 GMT by Deleted
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I like the spud gun - I've made a few and found that the length of the barrel make a lot of difference. I used 22mm copper for the chamber and 15mm for the barrel, with 3 metres of 22mm (1.5 metres each side, to a T and then the valve making a very elongated m shape) and 1.5 metres of 15mm for the barrel.
Using a potato to seal it, I fired a 5ft length of plain 14mm dowel well over 400 (The field we were on was 400m long and it easily cleared it :S) this was at 100psi.
It will fire 6 inch nails into trees, burying the head an inch in!
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rodharris83
Club Retro Rides Member
Day Dreamer...
Posts: 775
Club RR Member Number: 4
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^^Madness!
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My hydragas pump goes up to 400PSI odd if you want to have a play with that?
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1987 Maestro 1.6 HL perkins diesel conversion 1986 Audi 100 Avant 1800cc on LPG 1979 Allegro Series 2 special 4 door 1500cc with vynil roof. IN BITS. HERITAGE ISSUES.  |
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You Jonny are a nutcase! Bloody love it
What about a 12v compressor?
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cool. do you have to smack the valve open quickly? what about having it spring loaded with a trigger to release ?
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75 Range Rover 2 door 82 Range Rover 4 door
84 Range Rover 4 door 78 Datsun 120Y 2 door
78 Datsun 620 Pickup 81 Datsun Urvan E23 86 Datsun Vanette van
98 Electric Citroen Berlingo 00 Electric Peugeot Partner 02 Electric Citroen Berlingo
04 Berlingo Multispace petrol 07 Land Rover 130 15 Nissan E-NV200 15 Fiat Ducato
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Thats awesome, i started making a spud canon but i am going to make one like that now. Nice and simple and no fire. Would be great to see it shooting some targets!
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It will fire 6 inch nails into trees, burying the head an inch in! I wondered what would happen if I left the bolt in there It would definitely go better if I could shove it down a longer barrel. May have to make a little musket barrel tamper to go with it. The main plan of that end barrel is I've got a bad full of the little sealing olives so I can make a selection of different barrels that just screw on for different ammo. I reckon another 2" tank fitting in the end of some 2" steel pipe would go quite well with bigger vegetables You Jonny are a nutcase! Bloody love it What about a 12v compressor? Plan. Mine goes up to 260psi  cool. do you have to smack the valve open quickly? what about having it spring loaded with a trigger to release ? Just whanging it open quickly seems to do the trick. The mk2 may have something like that... |
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