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Geoff_H

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Everything posted by Geoff_H

  1. Geoff_H
    If I was doing a steam project I would use a vane motor for the propeller I would make the boiler the main item of concern. I also would make it closed loop. For the boiler would use very small bore high pressure tube because that is the lightest weight for the biggest surface area and power at using gasoline. I would definitely have a superheater in the boiler. Because it's a closed system I would need a condenser this would be some type of air condenser which is less efficient than a water condenser but that's all we have.
  2. Geoff_H
    Bunker C is solid at room temperature. A reasonably large heating system would required for the fuel tanks and feed system. You can walk on it and not leave an impression. Ships and power stations use it as it is very cheap.
  3. Geoff_H
    I don't know the horsepower of steam engine with the same displacement as a diesel, but it's output would depend upon the steam pressure. I would guess that the efficiency of the steam engine would be less than 5% if it was an open cycle and around 8% for a closed cycle. But so much depends upon the boiler. It's temperature and pressure delivered to the engine
  4. Geoff_H
    A steam power station with sub critical point operation would be around 34% efficient. A supercritical would get to around 60%. Please note that the combined cycle efficiency uses a gas turbine with a class C or D design and the exhaust from the gas turbine makes steam that uses a steam turbine to augment the output. Class H gas turbine will have around 60%=efficiency itself
  5. Geoff_H
    A condenser running close to a vacuum adds 33% to the power. Sub critical maximum efficiency is approx 34%. Super critical is up to around 50%. Why not burn a liquid fuel, much lighter and easier to handle
  6. Geoff_H
    Heat will only flow from the hotter to the lower temperature is the Zero'th law of thermodynamics, they had already named law 1 and law 2 and then realised that heat flow was even more important so it got the Zero law. If you want the most efficiently then raise the temperature and pressure above the critical point. At this point water goes directly to steam.
  7. Geoff_H
    The power for Birdsville uses the Organic Carnot Cycle, basically what I described in my post. They have a large amount of low temperature heat. Works well. CSIRO have tested the system in Victoria. They would not reveal the details of success or not. The Newcastle project should work well. Storage for energy can be hot water heaters, elements for backup in cold days
  8. Geoff_H
    I have proposed using a reverse air conditioning system with a pump using Solar heat and ambient heat to make electricity using the motor as a generator and using normal refrigerants. The efficiency is around 5 to 12%.The solar farm would be huge. ?
  9. Geoff_H
    A long time ago a guy called Carnot discovered a whole heap of rules about energy systems. One rule talks about the temperature that arrives at the engine and the temperature that it leaves. Generally, and don't quote this as it's far more complex, set both temperatures to degrees Kelvin, then the maximum energy that you can get out of the system is the difference between the temperatures divided by the higher temperature. As -273 deg Kelvin is hard to get 100% efficiency is out of the question. If your hot source is 273 Celcius and rejected temperature is 0deg C then it is 543 /273, or 50%. So the higher the high temperature and the lower the rejected temperature the more you can get out of the engine.
  10. Geoff_H
    What about a Stirling engine if fuel is unimportant. Maybe even coal?. Diesel made his engine to run on pulverised coal. He used oil to start the engine. Then he switched to pulverised coal, the wear was excessive on coal so it ended up oil only
  11. Geoff_H
    I would think that a steam turbine would be much lighter than a piston engine
  12. Geoff_H
    Crimping is not subject to corrosion. Yes the cheap plier type crimpers are useless and never should be used. Proper crimping with the correct tools is a galvanic bond that lasts the test of time. Look, at a distance, at the high tension power lines on those large towers that criss cross this country. They have already lasted around 50 years, each crimped not welded! The are crimped using hydraulic machinery. No aircraft manufacture of GA aircraft will deliver an aircraft with soldered wires.
  13. Geoff_H
    If soldering is unavoidable, then put heat shrink over the wire and solder joint area. It may help reduce the fatigue effect on the wire, no promises.
  14. Geoff_H
    From all of my experiences with soldering on vibration prone equipment I would buy the crimp equipment now and redo before the inevitable solder failure. Solder causes a fatigue failure at the point where the solder ends on the wire. According to Murphy the most important joint will fail at the most critical time, but Murphy was an optimist ? I too once soldered a jointing my intercom system.... luckily not a critical system. However I carried a very small gas powered soldering iron on touring, just to get me home, and yes used it at Carnarvon to repair my intercom. Crimped all joints when I got back home
  15. Geoff_H
    We only have 50hz in Australia. All grids, even outback grids are 50hz. 50hz within around +/- .01 hz
  16. Geoff_H
    No it's 100 Hertz. Each half of the wave clamps. The noise a transformer makes is always 100hz
  17. Geoff_H
    DC is far more lethal than AC. AC let's go 100 times a second. DC clamps muscles.
  18. Geoff_H
    I had one too many years ago. It went across my body. I had to lie down for the rest of the day. These days I would spend a day hooked up to a heart monitor in a hospital if it happened. All of us need to do this if it is an across the heart shock. In 1973 I acquired a then state of the art earth leakage circuit breaker, had a few shocks since then, don't even feel the shock, but trips the house off.?
  19. Geoff_H
    They seem to be using multiphase motors with inverters from DC. The CSIRO lightweight solar car powered motors stator has the windings and the rotor is the outside case with high flux permanent magnets. However my post that you have quoted was just to confirm that an AC motor will become a generator when it is running faster than the slip frequency. By the way, Tesla did heaps of work on AC, he discovered ( with straight mathematics) that the greatest power for the least conductor size is when you have 3 phases. It always astounds me when the American 220VAC is done with 2 phases 180 degrees apart.
  20. Geoff_H
    Navigation by Constance was used for long distance navigation. It used ADF but did not fly from or to the aid. It used rate of change of bearing to the aid. The Mooney that I owned was flown across the north Atlantic Ocean using the system I'm the 1980's. Not VOR but interesting. Very mathematical but I love applied mathematics. Including Full SAR.? Geoff
  21. Geoff_H
    Yes. A similar design of aircraft doesn't seem to be able to get approval. From what I believe the only thing stopping RAA from approving a multi engine aircraft is that they don't have an approval system and documentation that is approved. Not sure that I have the exact reason.
  22. Geoff_H
    My project has two small engines. I wish that I could go RAA, but I will have to go Experimental GA
  23. Geoff_H
    What about the configuration in my avatar??
  24. Geoff_H
    I was privileged some years ago to see the csiro' lightweight engine that was used for the solar race cars. It is essentially very strong magnets that were in a case that rotated around a field of wires in a pattern, these wires were fixed to the frame. Rotating around these wires that were stationery the casing was attached to the load this case be the propeller, the casing spun.
  25. Geoff_H
    You are as indispensable as the hold your hand leaves in a bucket full of water when it withdraws?
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