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Geoff_H

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Everything posted by Geoff_H

  1. Geoff_H
    A DC power metre. Having to extend cables for reading in flight would be difficult. Interesting anyway. MS6192-manualMain.pdf
  2. Geoff_H
    I think that for making a single or even a few stone lights an injection machine wouldn't be needed. A CNC or 3D printer ( both use slice code) would be able to make a plaster mould that could be used to make drape or vacuum molds for the cover. The bigger problem would be getting the LED pattern to cover the usually required light coverage. According to the design requirements the light has to cover over 180 degrees from the wings. If my research is correct the LED's have a beam angle of around 20 degrees. Hence an array of around 20 may be required, I am not sure of vertical design requirements. A CNC machine or 3D printer couldd be required for this, if I was using my machine skills would definitely be required. Not sure of wigwag requirements, I didn't know what they were until I saw them mentioned here, but I assume that their Perspex could be molded similarly.
  3. Geoff_H
    Sorry people I should have pm'd.
  4. Geoff_H
    I am looking for a system that measures the chlorine level and injects chlorine to maintain the correct level.
  5. Geoff_H
    Is the chlorinator automatic?
  6. Geoff_H
    I have made landing light covers in Perspex by making a plug from the old light cover then a mold of that in plaster of Paris. Then using Perspex made a part using draping. It turned out equally in quality to a new lense, at a fraction of the cost.
  7. Geoff_H
    Everything to do with aircraft is overpriced! Hence I am trying to design and build an aircraft for under $10k. Not sure that I am going to make it.?
  8. Geoff_H
    That should read "when you throw it into the air it stays in the air. Sorry for poor typing.
  9. Geoff_H
    The designer of the CozyIV, Natt Puffer, said that the only things that can be added to the aircraft are those things that pass the following test: When you throw it into it it stays in the air! ?
  10. Geoff_H
    I had a case split open in my Mooney. The acid destroyed the case and some of the airframe. Cost a considerable amount. It taught me a lot about batteries. We think that the regulator was faulty and cooked the battery leading to overheating and cracking of the case. Regulator was replaced.
  11. Geoff_H
    How is what you are saying and different to my statement? I just wanted everyone to know what I found out, the hard way. I was not countering anything you said. Some aircraft have car batteries, some aircraft batteries. They are slightly different.
  12. Geoff_H
    If you are using an aircraft battery be aware that they are different to car batteries. The charged voltages are different! Car chargers don't work as well on aircraft batteries.
  13. Geoff_H

    Jabiru overweight

    Geoff_H replied to rendrag's topic in Jabiru

    CofG behind centre of lift will make unstable aircraft. Centre of lift needs to include lift +/- from tail and fuselage.
  14. Geoff_H
    Flashing lights during the day (or night) have another good purpose. They frighten wild life away. Flashing apparently represents a pulse and this is not something that they want to mix it with. Good for outback landing. The Qantas flights into Kalgoorlie used to flash landing lights to scare the kangaroo population of the strip.
  15. Geoff_H
    And both a sunrise and sunset over water. It is one of the destinations that I must get to one day. The restaurant only operated six or so months of the year. You may have to take certain foods in for the chef to cook. All reports of the glamping are fantastic.
  16. Geoff_H
    Ok I am now retired. All the time to go flying. Wife hates flying these days.....she use to go with me sometimes. Been married over 50 years but I don't like going places without her. Real dilemma. Hence my project is only single seat ??
  17. Geoff_H
    I expect that they would correct a badly designed system. I expect that most if not all engine design engineers know of the problems that hiclones solve and prevent them from occurring. I owned a BMW some years ago, that used their M44 engine. A truly great engine. It had a variable length inlet manifold, short at high power for less losses in inlet pressure and long at low powers for better air fuel homogeneous mixing.
  18. Geoff_H
    In the steam power industry this happens all the time. It is wall attachment. A low flow of air, less than turbulent if my memory serves me right, will flow against one wall and not mix. I have done velocity traverses of ducts at low volume and found that the air was only using around 25% of the available duct. As the volume increased the flow became turbulent and filled the whole duct evenly ,(except dropping to zero velocity at the wall). If this is happening in an engine inlet manifold you have some problem with a ventury carb. Too big a carb will often give worse performance.
  19. Geoff_H
    Valve guides, timing gears (could be fibrous, or belt though)
  20. Geoff_H
    CASA produced a warning about using 98 fuel in aircraft some years ago. It has dissolved gasses in it. Their vapour pressure is low. On a hot day it is possible for these gasses to come out of solution in fuel lines and starve the engine of fuel. Each aircraft design needs to be checked for 98 in fuel lines at altitude on hot days.
  21. Geoff_H
    Yes you are right. I should have said the best operation conditions for cruise.
  22. Geoff_H
    A better gauge would be CO. When the value just starts to rise above zero best performance. Another gauge is residual oxygen in exhaust. Both are monitoring the combustion b
  23. Geoff_H
    M61A1 those gas turbines that you work on, are they Siemens gas turbines? Are they near Dalby? Vibration analysis is simple. Get a set of vibration traces, use a program to convert the vibration to frequency and amplitude (fast Fourier transform maths) using an ap freely available. Then look for things that happen at the largest frequency, how fast the machine is going, meshing speed of gears (all in hz). Finding a match in frequency will usually lead you to the problem.
  24. Geoff_H
    Vibration analysis is another very useful NDT tool. In industry the X, y and z axis vibration signature will be taking after commissioning. You were able to have other machines to compare with when something went wrong. I see all NDT as a health check, seeing possible problems long before they show up a problem. The best results for these tests is no result. Vibration analysis is really terrific for gearboxes, Meshing frequency can show a tooth starting to have problems. Good thing is that you can check the vibration with a mobile phone. I was able to determine the natural frequency of my house by measuring its vibration when the metro tunnelling machine passed under next door's house. Useless information, could be useful to earthquake proof the house ?. Ok I just love engineering, from 14 years of age when I discovered what an engineer was until now at 72. Now I just design my project.
  25. Geoff_H
    I no longer need these oil testing kits. They are prepaid just posting cost to USA. Free to anyone that wants them. Useless to Jabiru engines and 2 stroke engines, any others wanting them please pm. My project uses 2 stroke engines so no further use to me. Used this brand when I had the Mooney
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