I think they're made in Germany.
If it's running at half power, maybe 75lbs of kerosene for a couple hours flight time.
That's about 1/12 the thrust and 1/25 the weight of a first generation cruise missile engine such as the Williams F107.
On a sunny day (Mon, 14 May 2012 12:08:54 -0400) it happened Spehro Pefhany wrote in :
Price is a beet steep now ain't it? :-)
Looks like I have to invent a cheaper 'enjun'.
I guess if it really worked it could be sold to DOD.
BTW, I updated the software for the GPS module:
Direct link:
This one is pretty good and has many options, including a way to log data.
Short display:
latitude 12 degrees 98.0456 minutes N longitude 88 degrees 76.54321 minutes W altitude -6.8000 M speed 0.23 knots (nautical miles/h) speed 0.43 km/h course 111.96 degrees date 2012 5 14 16:32-56 UTC
--------------------------------------
Normal display: Panteltje (c) gpspc-0.3 for EM-411 GPS receiver board
control C exits.
latitude 12 degrees 98.0456 minutes N longitude 88 degrees 76.54321 minutes W altitude above sea level 18.2000 M geoid_separation 46.6000 M speed 0.22 knots (nautical miles/h) speed 0.41 km/h course 167.73 degrees date and time 2012 5 14 16:34-32 UTC Mode 3D GPS SPS Mode, fix valid pdop 2.7 hdop 1.5 vdop 2.2 satellites used 29 9 2 27 4 25 satellites in view 11 id 12 elevation 82 azimuth 60 snr 0 id 25 * elevation 49 azimuth 257 snr 30 id 9 * elevation 45 azimuth 130 snr 18 id 14 elevation 44 azimuth 286 snr 0 id 27 * elevation 31 azimuth 130 snr 26 id 4 * elevation 20 azimuth 75 snr 21 id 2 * elevation 16 azimuth 111 snr 26 id 29 * elevation 12 azimuth 197 snr 28 id 32 elevation 6 azimuth 343 snr 0 id 31 elevation 5 azimuth 301 snr 0 id 17 elevation 4 azimuth 37 snr 0
------------------------------
What is funny, and even amazing, is that I tried to shield the module - I put 2 10x16 cm alu plates, one below and one on top - and it lost some sats but gained others, and the signal was actually BETTER. This is a very amazing chipset. I could NOT make the signal go away, maybe alu foil all around it could.. That GHz stuff has a way to get into any opening it seems. mm, maybe in the microwave should kill it, have to try :-) (With microwave off of course).
On a sunny day (Mon, 14 May 2012 12:08:54 -0400) it happened Spehro Pefhany wrote in :
PS
I was thinking, and it occurred to me: I have the cryo cooler, and to make liquid air is the easiest thing. I also remember Von Brauns's designs for V2... He used a plate with small holes in it to push the fuel into the combustion chamber. Now if I just push and maybe we need a turbo pump, the liquid air into the chamber... Liquid air was used as explosive in some WW (3? 4? or was it 1? or 2?_) Point to check is how much can you compress liquid air before it explodes all by itself... hey, but cheap (electrickity only) clean fuel, and a simple enjun. With almost the parts at hand.
And that was only ... wonder what I think of next - and if it is wise to post it here -.
Sound pretty reasonable to me, at least compared to $1m for a cruise missile.
Automotive "turbo" boosters apparently can be modified for a homemade turbine. Not sure how good they are.
A modern small version of a pulse jet might be interesting.. like the old German V-1 buzz bombs.
I would hope so.
On a sunny day (Mon, 14 May 2012 17:31:17 GMT) it happened Jan Panteltje wrote in :
As to price: I remember a TeaFee program that shows a lab where they had a real Russian Scud engine. Not sure if it was an university lab or some other lab, The professor (must have been uni yes) said: "For 10000 Euro we bought this one form Russia." Worth a trip to Russia if you are into that sort of thing perhaps. But was long time ago, inflation..... Still good value for money, hey and even NASA flies Russian space craft to the ISS.
chamber.
by itself...
it here -.
Wikipedia says:
During World War Two, Nazi Germany reportedly experimented with a bomb made from liquid air and coal dust.
Doesn't sound like a good fuel if it tends to go bang.
Kerosene is pretty cheap (diesel fuel). $1.30 a liter around here, including all kinds of taxes. I could probably get a few hundred liters for free if I wanted it because they drain aircraft tanks (turboprop) now and then.
On a sunny day (Mon, 14 May 2012 13:49:46 -0400) it happened Spehro Pefhany wrote in :
So, that solves the turbo pump problem. Here is the scheme: Make liquid air with cryocooler (I have) Make compressed air with compressor (I have) Use compressed air to push liquid air via small holes in combustion chamber (have to think on how to get that one from stuff I have) Ignite with sparkplug .. electronics (I have) Control with GPS an cheap pressure sensor Build airframe from light foam or carbon fiber The compressed air tank can also be a carbon composite one. Fill with flowers Send to address.
On a sunny day (Mon, 14 May 2012 13:54:33 -0400) it happened Spehro Pefhany wrote in :
Rumor goes some Russian torpedos using similar 2 component mixed fuel exploded and caused a nuclear sub to sink. Still this is a cheap fuel. You van use water and split it in hydrogen and oxygen too, very dangerous to handle. But if it has to go boom anyways then why not.
mm lucky you, does a car drive on it? Petrol is very expensive now in Europe.
chamber.
by itself...
it here -.
Dust of any sort can be pretty explosive. I remember, clear back in Junior High School, of demonstrating, in my science class, why grain elevators sometimes blow up.
My experiment:
Pipe (1#) tobacco can with small hole in bottom Small funnel poking thru that hole Rubber tubing on end of funnel Candle (lit) in can Teaspoon of flour in funnel Snap lid on tobacco can Blow into tubing
Dent ceiling of classroom with can lid ;-) ...Jim Thompson
You forgot: Hold my Mt. Dew and watch THIS!!!
and caused a nuclear sub to sink.
handle.
I don't have a diesel car or truck, but I think it would work for that kind of vehicle (it's Jet A-1), perhaps with added lubrication and some consideration to legality (the price is considerably higher than car fuel, IIRC, but there may be technicalities wrt taxes).
I thought older (30 years) technology was just to set the gyro and "lob" the missile skyward. Then, let it coast to its target (parabolic flight path)
Yet the military relies on GPS. Probably on the belief that an adversary escalating "retaliation" to the point of interfering (or destroying) those assets would raise the stakes *SO* high that "other options" could be brought in to retaliate (?)
But that relies on the jitter having a "distribution" that spans the averaging interval. E.g., a device that shows a (fixed) delay of N for "some time" and then "suddenly" shows a delay of M is hard to work with. You want there to be "sufficient noise" in the jitter -- and, of a "tight enough" distribution -- that you can average it out. If the distribution skews one way and then another over *long* intervals, you'll see those "steps" in the output accuracy.
[If the device isn't well specified, what do you safely assume?]
"We're gonna need another Timmy..."
exploded and caused a nuclear sub to sink.
handle.
I was under the impression that airports and the military nowadays used diesel vehicles almost exclusively, because then they only need to stock and supply one type of fuel; jet-a1
old diesels will run on almost anything, though I'm not so sure about modern diesels those super high pressure pumps are only lubricated by the fuel and they are very expensive to replace
not so long ago lots of people were running their diesels on heating oil, the tax was different so it was half the price of diesel
now it's colored, just like tax free gasoline and diesel for farms etc.
-Lasse
hany
tion chamber.
es all by itself...
o post it here -.
-Lasse
If you're the guy fueling and handling it, then the question of
*where* it goes boom would have some amount of importance, I think?
Yes. Hence my wondering how this (my) unit "adjusts" the sensed value for accuracy.
At 1Hz, you would probably have problems designing a good time server -- not that it would be impossible. You'd just have to think carefully about your tuning constants.
to GPS time.
for applications demanding the highest possible precision at all times.
are considered accurate enough to meet all but the most sensitive applications.
That sounds about right. No idea what the "fine details" regarding each of those quality ratings would entail.
A knot is "a minute of equator per hour". About 6000 ft/hr. (it has been redefined several times historically) Note that it is defined at the equator as lines of increasing latitude have diminishing circumferences (d'uh!). And, meridians have a different circumference than the equator due to the oblateness of the earth.
The instantaneous arrangement of the satellites in the sky wrt your position determines these metrics.
This is sort of the inverse case that it was with LORAN -- where the beacons were stationary and the observation *location* was varied (in your case, you are stationary and the beacons are in motion!)
Regardless, it all boils down to the geometry of the beacons wrt the observation point. With LORAN, you could statically and in perpetuity define regions on the globe with high GDoP (for a particular chain). With GPS, this varies (though I am sure there are some places that average far better results than others -- no doubt by a careful choice of orbits!)
Yes. But, in that case, the world is a binary place: "over there" and "over HERE" being the two places. The former is probably more preferable than the latter! ;-)
Yep ;-) ...Jim Thompson
Here in the US the feds were convinced that truckers where going out to the local airport to buy Jet A and not be taxed at the higher road use tax. They put in a bunch of regulations on airport fuelers even though (non commerical) Jet-A cost a dollar or more per gallon than diesel at the local pump. Our tax dollars at work....
watch the wrap or use
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