Moderator: Mike Everman
Dang911 wrote:One question though, could you clarify the position of the fuel/air tube? From what I understand, it needs to be centered in the intake, and the "super complex" tool is for?........ I like the smell of the tool, strawberry maybe?
Do I push the fuel/air tube in it as far as it will let me go before the bend in the tube stops, hitting the engine?
Dang911 wrote:The starting tube was VERY easy to align, it was basically self aligning, all I had to do is eyeball the air tube 13 mm from the start of the small intake centered it horizontally. Then just a 1 second tack weld on the rings that the air tube went through, and it was held it in place just fine!
The simple support wire at the end was almost useless, it supports the top of the exhaust tube, not the bottom. Supplying a simple L bracket that would need to be welded onto the bottom of the exhaust tube, and screwed into the wood base would be quite satisfactory, the flimsy and fussy wire bent support didn't do the job well.
The concept of the kit was excellent, and the fabrication was light, with tools everyone should have. The kit was intended that you also have a welder, but unfortunately, it looked like the kit was intended for someone with a very expensive welding setup. Since the metal was so thin, I ended up welding it with a MiG, at 1 amp, yes just one (1) amp!!! This would not be good for a beginner welder, and was difficult for me, although I would consider myself practically a beginner.
To fix the above problem, the kit should be made with thicker material, lets say 1/16". This will make it a true beginners kit. This is what I had the most trouble with, and I would want changed. With thicker metal, it will be easy to weld it with different welding processes, and lower quality welders, for people with only basic skill.
This "kit", in my opinion appeals to the noob. I myself can be the best example. I had fussed on building my first own, and still unsuccessful pulse jet. When I put this pulse jet kit together, and had it running, (its very reliable, starts instantly all the time) I now know more about pulse jets than what this forum could offer, it was that experience that really got me hook. Now in the upcoming days I am ready to fire up my all stainless 55lb lockwood, I can't wait. All of that energy coming from this kit, which helped me gain the fundamentals, and get a working, easily built pulse jet.
As we see on this forum there are many people who see these and are astonished by them, and then set out with millions of questions, only to find out that they are too difficult to build, or they do not have the resources to build it. This is there chance to get a reasonably priced kit, which can get them into pulse jet experimenting!
The price remains the same, $90-$110 would be a good price for this "guaranteed" working pulse jet engine, that is very easy for the beginner to build.
The last concern is starting up the engine. For this you are right, you need some special equipment. But nothing extraordinary. I haven't tried, but it is probably possible to start this up using a bicycle pump, what do you think? As for the spark, there are many alternatives out there, that are not only reasonably priced, but ready to work right out of the box. I myself built my own sparker unit with a 555 chip and a rectifier mosfet, but that's just me. For fuel I had great success with an "off the shelf" set up. Two of them in fact. One was a 20 PSI regulator to a big turkey fryer ($23) that hooks up to a 20lb propane tank, the other was a small torch ($13), that just had to be disassembled, and reassembled, minus 2 parts (diaphragm, and flow meter). After that I had those small tanks pushing over 80 PSI of propane, even though I only needed about 18 to run the engine, 12 once it was warmed up!
I still apologize for the delay on pictures of this engine running, please bare with me, I live in an upscale gated neighborhood. I ran this engine once, and got 5 complains from my non tolerant neighbors. When my Parents and I came back into the house and listened to our messages, I took a lot of crap.... Because of this I can only run this engine in remote places. The night pictures and video are what will be the hardest for me to get, I still haven't seen it run at night. This is all top priority on my list, and I should be able to the media by early next week.
Oh and as far as the aluminum shielding goes, I didn't have any thick aluminum sheet and didn't bother for foil. I ended up just placing some cut up road sign directly under the combustion chamber. Yes it was too late I had already chard the wood, and it actually caught fire once ...
Dang911 wrote:The last concern is starting up the engine. For this you are right, you need some special equipment. But nothing extraordinary. I haven't tried, but it is probably possible to start this up using a bicycle pump, what do you think?
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