Search found 64 matches

by sparks
Mon Feb 23, 2004 11:24 am
Forum: Valved pulsejet forum
Topic: Dimension tailpipe pulse 1
Replies: 6
Views: 3076

Well, the difference in area is about 148 mm^2 . (48mm gives ~1810 mm^2 and 46 mm ~1662mm^2) My guess is it will not make any difference compared to what comes from less than perfect welding, cutting,meassurements unlesse one is very good at all the aspects of metalworking that one is confronted wit...
by sparks
Mon Feb 23, 2004 10:55 am
Forum: Valved pulsejet forum
Topic: I just read "The Propulsive Duct"
Replies: 4
Views: 3259

Ha, i figured it out at last! But it took a couple of days before i thought of what the valves does and when. Since most reed-valves have their restingposition at the valveseat and not between the endpoints of their movement (like in the winspire book) They will only move during the negative halfper...
by sparks
Wed Feb 18, 2004 1:21 pm
Forum: Valved pulsejet forum
Topic: I just read "The Propulsive Duct"
Replies: 4
Views: 3259

If i would have ended up with some higher multiple of the "target-frequency" it wouldn´t been much of a surprise since that indicates that the valves are light enough to have the engines freq. induced on them.
The opposite result is a bit annoying cause i cant see what i did wrong.
by sparks
Sun Feb 15, 2004 4:39 am
Forum: Valved pulsejet forum
Topic: Resizing solved, but...
Replies: 29
Views: 15695

I just wanted to bring this subject up since this book is one of the things i just cant get out of my mind.
I dont understand a word or letter, but its obvious that it contains unvaluable information.
by sparks
Sun Feb 15, 2004 4:06 am
Forum: Valved pulsejet forum
Topic: I just read "The Propulsive Duct"
Replies: 4
Views: 3259

I just read "The Propulsive Duct"

Well i read it, and it was some of it that i have to chew on a bit more to be able to say that i understand it. One thing i just couldn´t fit into my picture of the world was the results i got when calculating resonansefrequency of reed valves. Many valves from "tried-and-tested" designs gave res. ...
by sparks
Sun Feb 15, 2004 3:27 am
Forum: Valveless pulsejet forum
Topic: 75mm Locky Kazoo (say that 10 times fast)
Replies: 107
Views: 75104

Jeeez, do you all realise that we have just witnessed a historic event? The birth of a new pulejetdesign. Looks really good! I guess one could make a whole lot of them and tune them into some kind of musicinstrument from hell ;-) Someting tells me that my neighbors hate for my humble existense will ...
by sparks
Sat Feb 14, 2004 6:59 am
Forum: Off topic forum
Topic: Solar Concentrators
Replies: 1
Views: 1513

Try a search for solar stirling fresnel.
I know they are used by solar-stirling-freaks
by sparks
Sat Feb 14, 2004 5:35 am
Forum: Tools and Construction
Topic: Hydroforming the Albion Way
Replies: 13
Views: 7205

Yes, i guessed it was a simple plunger type pump, what occupied my thougts was if it was with a tight fitting piston or rubber seals. Maybe i drop him a line later, this is still just a mindgame but i have this obsession to have some experience of all useful trix i come across. You know, its just a ...
by sparks
Fri Feb 13, 2004 9:16 pm
Forum: Tools and Construction
Topic: Hydroforming the Albion Way
Replies: 13
Views: 7205

I thought a checkvalve would be needed but after some brainstorming with my brother i think not.
As long as the sheetmetal can give after there will not be much backflow.
That make a brake main cylinder a possible candidate.
But still it would be interesting to know what pump was used.
by sparks
Tue Feb 10, 2004 3:46 am
Forum: Tools and Construction
Topic: How does this work?
Replies: 21
Views: 12189

Finding small CO2 bottles is easy, at least in Sweden. There was this very popular machine for making sodawater and other carbonated drinks some ten or fifteen years ago. Many still use them, and because of that there are still many places where one can change the refillable CO2 bottles. First the b...
by sparks
Mon Feb 09, 2004 12:15 am
Forum: Valved pulsejet forum
Topic: Pulse Jet plans?
Replies: 22
Views: 10707

Besides, there aren´t many plans in swedish.
The language to learn is russian, including the kiryllic(sp?) alphabeth.
That book on pulsoreactores drives me nuts, since i just dont understand a word.
If i only had my old polish classmate from long ago here.
by sparks
Sat Feb 07, 2004 4:42 pm
Forum: Off topic forum
Topic: Particle beams (this totally off-topic)
Replies: 14
Views: 6047

Since it emits light in the uv-region (close to uvb i think) the only way to see it is to project it on a flourescent screen. Indexcards and ordinary printerpaper etc. usually has some optical whitener added and will make the pulses visible like a very bright, very blue dot or band. I made mine beca...
by sparks
Fri Feb 06, 2004 2:51 am
Forum: Tools and Construction
Topic: Hydroforming the Albion Way
Replies: 13
Views: 7205

Any ideas on what kind of pump they were using?
Or what could be used, standard brakeparts may be a bit on the weak side.
by sparks
Fri Feb 06, 2004 2:11 am
Forum: Off topic forum
Topic: Particle beams (this totally off-topic)
Replies: 14
Views: 6047

They are basically the same as the ones you got, except they use a buzzcoil as HV-source.
But i think theres a link in Sams laser FAQ to the original S.A.plans.
It was pretty amazing to see it work at the first try when i made mine.
by sparks
Thu Feb 05, 2004 3:05 am
Forum: Off topic forum
Topic: Particle beams (this totally off-topic)
Replies: 14
Views: 6047

Those plans are a good start. Just a couple of things:the copper foil connecting the dischargechamber to the capasitors must be as short and straight as possible to cut inductances to a minimum. You want to keep the chambervolume down since gas (air) must flow while maintaining reduced pressure. Mak...