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  1. Delta Force

    Using Fuel as a Combustion Engine Coolant?

    100 horsepower * 0.45 pounds of gasoline per horsepower-hour = 45 pounds of gasoline per hour 45 pounds of gasoline per hour * 1/3 of energy content to the radiator = 15 pounds of gasoline energy content to the radiator per hour Gasoline requires 0.53 British Thermal Units to raise 1 pound of...
  2. Delta Force

    Using Fuel as a Combustion Engine Coolant?

    Some jet and rocket engines use their own fuel as coolant. Hydrocarbons have even been used to cool electronics and nuclear reactors. Would it be viable for a combustion engine to use its own fuel as coolant instead of water or another liquid?
  3. Delta Force

    Did the Tokaimura Criticality Incident Create an AHR?

    Even decades after the events there seems to be a lack of clarity about some of the firsts in nuclear power. Big Rock Point was one of the first commercial nuclear reactors, but it wasn't the first in the world or even the United States (although it was the first in Michigan). Dresden predated...
  4. Delta Force

    Did the Tokaimura Criticality Incident Create an AHR?

    The Tokaimura Criticality Incident involved the improper mixture of 18.8% enriched uranium and nitric acid in a 100 liter precipitation tank that was 450 mm in diameter and 650 mm high. The tank was surrounded by a water filled cooling jacket. When enough of the mixture was in the tank a...
  5. Delta Force

    Engine Type/Configuration and Aircraft Performance

    The image you showed links to an article on propulsive efficiency, which might explain what I'm wondering about, which is if there is a mathematical way to compare the performance of different aircraft engine types and configurations. That graph seems to illustrate the difference for engine...
  6. Delta Force

    Engine Type/Configuration and Aircraft Performance

    Some jet engines have turboprop variants, and turboprops are rated in horsepower/watts just like piston engines. It's also possible for propeller engines to be mounted in puller and pusher configurations. While it's not possible to directly compare different engine types, what would happen if...
  7. Delta Force

    Properties of Depleted and Natural Uranium?

    Does that mean that a counterweight or even an armor alloy would have identical performance regardless of the isotopic composition of the uranium used to make it?
  8. Delta Force

    Properties of Depleted and Natural Uranium?

    Depleted uranium is often used for applications in which high density is valued, such as counterweights, tank armor, and armor-piercing ammunition. Obviously there are going to be some differences between depleted uranium (defined as having 0.3% or less U-235) and natural uranium (averaging...
  9. Delta Force

    Engineering What Do Nuclear Engineers Do?

    I'm not sure this is the right area of the forum for this, but I've been wondering about what types of things people do with nuclear engineering degrees, especially those who graduate from universities in areas where nuclear power is stagnant or in decline. The last major growth period for...
  10. Delta Force

    What is the size of the nuclear reactor part of a nuclear power plant

    It seems all advanced nuclear power plant concepts focus on higher temperatures for steam or gas turbines, but I'm unaware of any that propose using a combined cycle. Why aren't there any proposals for combined cycle when it has been extensively used in fossil fuel facilities since the 1990s?
  11. Delta Force

    Mini-Magnetospheres on Mars?

    The Technical University of Denmark has a page about the Martian magnetosphere in which it mentions the existence of localized mini-magnetospheres on Mars that are more powerful than the global field around Earth (source). What causes the mini-magnetospheres and how extensive is their strength...
  12. Delta Force

    Power Production at Hanford N-Reactor

    During the early development of nuclear power many utilities were concerned that the United States federal government would create an "Atomic TVA" and crowd them out. As a result the plutonium production reactors in the United States didn't have steam turbines to generate electricity from the...
  13. Delta Force

    Smallest Possible Nuclear Reactor?

    It's somewhat related to science fiction. I was wondering if a small nuclear reactor could be a good alternative to solar panels and radioisotope generators for space power applications. Historically only a few nuclear powered spacecraft have flown: SNAP-10A for the United States and a series of...
  14. Delta Force

    Smallest Possible Nuclear Reactor?

    What's the smallest nuclear reactor possible in terms of size and/or weight? What kind of power output could it achieve?
  15. Delta Force

    Automotive Modern Inline Eight Gasoline Engines

    That's kind of what I was wondering about. Wikipedia hints at the crankshaft being a weak point of the design, especially at "high speeds." Presumably that explains why there are still inline eight diesel engines, but wouldn't the crankshaft issues still emerge in a V16 gasoline engine?
  16. Delta Force

    Automotive Modern Inline Eight Gasoline Engines

    Could a modern inline eight gasoline engine be competitive with other designs, especially for high performance applications such as a limousine or supercar?
  17. Delta Force

    Question about Midland Cogenerating Nuclear Power Plant

    Midland Nuclear Power Plant was going to have two nuclear reactors from Babcock & Wilcox. Unit 1 was to have a capacity of 460 MWe, while Unit 2 was to have a capacity of 808 MWe. Were the reactors twins that simply had different steam machinery due to the cogeneration requirements or were they...
  18. Delta Force

    Ship Performance after Reboilering

    I'm trying to do some rough estimates of how much additional performance a steam powered warship (World War I to 1950 or so) could get from receiving new engines. I'm aware that different hull designs have different impacts on drag in the water, but for the rough estimate I'm focusing on the...
  19. Delta Force

    How Do Steam Plants Use Different Fuels?

    Historically it wasn't uncommon for boilers to be run on fuels different from those they were originally designed for. Ships were commonly converted from coal to petroleum after the 1910s, and for a period of time it was common to convert power plants from coal to petroleum as well. A common...
  20. Delta Force

    Chernobyl Soviet Power Grid Post-Chernobyl

    Did the Chernobyl Disaster have any major effects on the Soviet power grid as a direct result of the accident or due the retrofit and cancellation of RBMK reactors?
  21. Delta Force

    Organically Cooled Computers?

    Apparently its possible to use special mineral oil to cool a computer. However, some of the issues with the technology as described here are that the computer might run hot enough to crack an acrylic tank and humidity might enter the tank through air bubbles. Are there any ways to mitigate these...
  22. Delta Force

    Why does the US prefer fusion warheads to fission warheads?

    The United Kingdom pursued a fission approach in the 1950s due to difficulties developing thermonuclear bomb technology. They found a lot of problems with pure fission devices and moved to thermonuclear designs as soon as possible. Those are weight, inefficient materials usage, safety and...
  23. Delta Force

    Nuclear Plant Batteries

    Batteries are becoming price competitive with diesel engines for providing peaker power. If a nuclear power station has a battery storage site located nearby it could use that to help with safety, especially if there are some renewable power units nearby that feed power to the storage unit.
  24. Delta Force

    March 1945 Hanford Substation Fire

    To clarify why I'm asking this, I'm interested in counterfactual history and this is a little known event in early nuclear history that could have had major repercussions for the Manhattan Project and the end of World War II. On March 10, 1945, one of the last Japanese fire balloons fell on...
  25. Delta Force

    Worst Case Windscale Fire?

    I'm wondering how bad things could have gotten if Cockcroft's Follies had not been fitted to the reactor, as well as if the water injections could have caused a reactor explosion. At Three Mile Island the operators were very concerned about the hydrogen bubble in the pressure vessel being...
  26. Delta Force

    Worst Case Windscale Fire?

    The Windscale Fire seems like it had the potential to become a much more serious incident due to actions taken in trying to get the reactor under control. First the operators ran the air fans at high speed to try to cool the reactor, but that only made the fire even more intense. Then crews...
  27. Delta Force

    Nuclear Plant Batteries

    Are there any plans to make more extensive use of batteries for future nuclear power plants or modernize existing plants to use them as safety systems?
  28. Delta Force

    Climate Effects of Cleaner Fossil Fuels?

    My understanding of climatology is that sulfur elements have a proven cooling effect while there is less certainty around particulate elements (which could have a cooling or warming effect). I'm wondering how changes in energy use since the 1970s might have impacted climate change, particularly...
  29. Delta Force

    Nuclear Plant Batteries

    So there are batteries for the pumps, they just can't actually run them? I thought the batteries could actually run the pumps and would thus be in the MWh range.
  30. Delta Force

    Nuclear Plant Batteries

    It seems that the batteries installed at nuclear power plants would have been one of the largest scale applications of battery technology prior to the development of battery storage stations for utilities. I'm wondering what kind of technology they use(d) and what kind of lifespan, capacity, and...
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