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I take it that the Mach 1 limit is in part because the ring gap is rectangular nozzle instead of a convergent/divergent nozzle. I suspect that besides machining simplicity the ends of the rings are machined with as little rounding of the corners as possible to block gas flow from becoming...

Also, some compressed air components have marginally overstated overstated ratings - you generally do not want to run air compressors, aftercoolers, refrigerated filter dryers, etc. at their maximum ratings. Instead, you need to run them a little less than their ratings.

There are also air conditioners that are built for cooling control panels. These will generally be more economical than vortex coolers IF the environment is clean enough for an air cooled air conditioner. The disadvantage of compressed or is that about 2/3rds of the work done by the compressor...

The first time that I installed a punch press ( metal stamping ) press was a 400 ton Minster press that had been manufactured in the late 1950s. When the Akron-Selle Company purchased this press from Monarch Rubber in 1993 they had a millwright contractor rebuild the press and check out its...

Part of what is confusing you is that time delay ( on overload ) fuses and circuit breakers were invented to allow motors to start without having to size the fuse of circuit breaker for say 1,400% of motor full load current. The ability of a generator to start and run a motor depends on a few...

I have also seen at least 1 instance where somebody deliberately maladjusted their diesel engine ( in this case a pickup truck ) to produce soot every time they stepped on the accelerator. This can be done by backing out the screw that limits the maximum displacement of the injector pump causing...

There is a woman over at Quora.com who says that she sustained $2,400 in engine damage after someone put sugar in her fuel tank. The sugar somehow got past the fuel filter and the fuel injectors. Since her car warranty did NOT cover vandalism she had to pay the bill. That is proof that sugar...

I am worried about sand which is really easy to filter. HEY PUD: A locking fuel cap for a fixed fuel tank can be defeated with a PIPE WRENCH. MacGyvers2000: I cannot find data on the solubility of sugar in gasohol. I suggest that you run the experiment. Sugar is soluble in ethanol and there...

I forgot to mention that there is NO data available ( at least not through Google ) on whether sugar is soluble in fuel stabilizers. So, I suggest that you test solubility of sugar in fuel stabilizers. I do not have the money or the facilities to run these experiments. In some applications...

TugboatEng: According to the Popular Mechanics website, sugar will not dissolve in gasoline but will clog up the fuel filter. I am looking for something that will do a better job of trapping sugar other than letting it clog a fuel filter or putting in a bigger fuel filter and stocking LOTS of...

1. I did not notice that there is a fuel forum before I posted in the General Mechanical forum. 2. MacGyvers2000: During World War 2 male pilots sabotaged airplanes that were flown by female pilots by putting sugar in the fuel tank. I suggest that you check your data. Putting sugar into fuel...

You can buy off the shelf electrically powered linear actuators that meet all your needs including a parking brake when powered off just the brakes in bridge cranes and elevators. You do not need to build them from scratch. You should try off the shelf first because that will be cheaper than...

By the way, some power plant generators are cooled with pressurized hydrogen because it is a very efficient heat transfer fluid both because of its ability to convey heat and it requires less power to blow it around than air. Also, hydrogen without any oxygen or moisture protects the generator...

When I built somebody a pipeline antifreeze system using self regulating heat tapes and thermal insulation I installed line voltage thermostats that would turn off the power when room temperature went above about 40 Fahrenheit. There is nothing illegal about that. At 50 Fahrenheit self...

Also, ungrounded 3-wire 3-phase systems that have no transformer + light bulb ground detector or similar means to drain direct current from the system can build up EXPLOSIVE amounts of static electricity during rain if there is any amount of overhead line. At 1 factory where they had 480 volts...

Also, Cleveland Electric Illuminating Company has lattice work steel towers that are this high where their 4 circuit 138 KV backbone goes over Interstate 480 and the southern sewage plant just west of I-77. I am glad that I do not live in New Orleans and instead in Columbus, Ohio.

dlc: New York City has quite a bit of 345 KV underground cables and they are very reliable. One of the NYC power outages was that lightning stuck a double circuit overhead tower north of the city where the 6 circuit 345 KV main line ran over a solid rock hilltop. The lightning caused those 2...

I know that back in the 1970s there was a better designed 3rd party oil cooler for Volkswagen Beetles that would replace the stock oil cooler. It had a flange that bolted in place of the OEM oil cooler and 2 hoses that would go to a fin and tube heat exchanger that mounted in front of the...

Back in 9th grade Power Technology class the spark tester for lawnmower engines had a 1/4 inch or so spark gap to determine if there was enough voltage to fire a smaller gap at high pressures. If the spark cannot jump a 1/4 inch gap at atmospheric pressure it will not work with the spark plug...

A lot of engine inefficiency is due to the cooling jacket. If you could find a magic material that did not need to be cooled to keep it from melting. I read somewhere that if diesel engines did not need coolant they would be about 70% efficient instead of the usual 35% efficiency. This is...