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Thanks Inch, I think I have the hydraulics nailed pretty well. With a base demand of 200gpm and a 75psi to 70psi bleed down time of 2 minutes, an air volume of 5600 gallons is required. That is about what we have now with a 10000 gallon tank. A bladder of several hundred cubic feet for that...

bimr: "Is this a new problem, a new system, or a problem that has occurred for a long time." Thanks, should have said. This prob has been there for several years. Short history: The tank date is 1999. There hadn't been much talent around or motivation to get things right. Recent newspaper...

Operatorjoe addl: Re: your suggestion that about the pumps as a source of air, the water is clear at a tee connection between the pump and the tank. I will double chk it though. ron

The pressure varies between about 70psi to 75psi as the pumps cycles on/off every few minutes. The sight gauge shows about half full. A pump run raises the level an inch or two from the turn on point. Opjoe: If air was being pulled in by the pumps, the sight gauge would show falling water level...

Thank you for the response Littleinch. ("Littleinch", an epic pipeline I heard of as a kid. What a country we were![smile] ) - Our system flows about 100 gpm to 2000 gpm and the boosters are on/off 25 to 75 hp pumps. So, the railroad car sized air-over-water tank/accumulator seems necessary...

Our small muni water system uses a ~10,000 gal hydro-pneumatic tank in combination with booster pumps to deliver water to our customers. A suitable elevated tank is not feasible. The system works OK, but air infuses into the flow in the tank causing a very objectionable temporary cloudiness at...

Re: the tank engines. They were quite common, called "tank engines" and available surplus for many years after the war. They were Continental W-670's, 7 cylinder, rated 225 hp. Used often by crop dusters. (why overhaul? just get another tank engine) On gasoline fueled armor: Pilot sometimes...

R-680 Lycoming, I believe. 680 cu.in. 300 hp @ ~2100 rpm They where one engine option for a Stinson Reliant. I flew one so equiped in the 60's, an oldy-but-goody even then. Very smooth. But in a motorcycle? I only believes it cuz I sees it.

Thx mohpower for the post. If I read that post just one more time, I think I'll have it down for good. That "ferro-resonance" has been a bit of a mystery 'til now. I might add that I had used these regulators many years ago. There is one MAJOR shortcoming of these units that anyone...

Waross:"Remember that capacitor current increases as the square of the voltage..." Typo? I think you meant VoltAmpsReactive increases by the square of the voltage. Good comments on this prob though. And, yes, nice meter. $$? I may be bugging you power side guys soon. Re: VSD's and soft starts...

Since side branching of a fuel hydrocarbon has a big effect on octane number, I am not sure one can be very predictive of fuel performance by using merely the carbon/hydrogen ratios. For example, normal octane (C8H18) has very poor performance, but Tri Methyl Pentane, also (C8H18), and also...

sciguyjim - I messed with radiating surfaces and coatings years ago. What I remembered was that ALL paints are nearly black in the far infrared. Here is a link to a commercial site, the same outfit with those nasty pop-up ads, BTW. But the table is fairly complete...

lewish - An Opamp can not swing its output to the rails. Thus if you use +/-5V as your supplies you can swing the output from -3.8 to +3.8 volts. A pleasant surprise for those of us who had not done much opamp shopping recently. There are now a variety of rail to rail opamps at little...

re: telco Sorry, just meant the telephone company - jargon. If the modem path is through the wireless link, then through the telephone system to a remotely located modem, both systems will add noise, distortion and bandwidth limitation of their own. The sum of these will determine what the...

Here is a link on telephone interfacing. From what I have looked at, there is a lot there at the right level to help you. http://www.hut.fi/Misc/Electronics/circuits/teleinterface.html Just below the middle of that long page, are some op amp interface circuits that might be of interest. Your...

parima - Supposedly you want more o2 under load and in traffic under idle conditions. where the air is exhaust from the car in front of you This caused me to start "cipherin'", as someone called it. If one is behind another vehicle which is burning fuel at the rate of 20 miles per...

What you are attempting should be possible, but not at 56k speeds, not even in theory. In fact, due to distortion and noise, it will likely be much lower. One thing your ckt probably needs is a hybrid connection between your send/receive ckts and the modem line. The modem already HAS a hybrid...

I've seen these NACA scoops ( usually used for cooling aft equipment ) implemented with both overhanging edges and raised VG edges on mil acft even years ago. I have yet to find a good tech ref with boundary layer details, etc. for these scoops. Anything on the web? Any efficient scoop has to...

I am suspicious of the picovolt ref. That is a tiny 240*10^-12 volt, way down in thermal noise and too low for common interfacing. channey99 - Hi. Good refs on the devices. A little OT for the thread, but I stumbled onto a link with some Toyota interface details. It might be useful to you for...

Using a linear regulator, resistors, zeners, means you will have to figure out how you are going to dissipate ~25 watts. That might range from very easy to impossible, depending on the application. There are 3 amp linear regs around. Using the right sized power resistor to feed it will put...