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Geoff_H

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Everything posted by Geoff_H

  1. Geoff_H
    I continue with the Class 2 medical because the Class 2 Basic cost me more than the class 2. I also had ideas of doing some aerobatics. I did the Basic some years ago and the eye test cost made it too expensive. Now I have to do a stress test maybe the basic is an option. Does anyone know if I need a stress test for a Basic?
  2. Geoff_H
    In the late 1990's CASA published an article saying that there were five medical issues that could loose you your medical. If I remember rightly heart, diabetes and three others. In that time your DAME was instructed to ask how much exercise you did at the time of your examination. I replied that I walked to the station, around a kilometre each way, he said he would give me a yes on that. At the time I thought that he was being too generous. However despite many go it alone exercise attempts I started doing aerobics in 1998. It is a passion that I do this day. My resting heart rate hovers around 50. My biological age is 20years younger than my physical age. I would recommend it to anyone. I have to thank CASA for my fitness and enjoyment of life.
  3. Geoff_H
    I expect to live until 99years of age, then expect that I will be shot dead by a jealous husband. Said first by some American celebrity
  4. Geoff_H
    116% was coasting, I was still walking and they terminated the test saying "that's enough we don't need anymore'. My heart rate will go to 180bpm. This morning at the gym I got to 184bpm no pain at all. I have had a test that injected x-ray dye into the heart area and had only small blockages, much less than 40%. It is with these results I wonder why I have to pay for a yearly stress test, my age? Certainly not my fitness. By the way I have to suit comprehensive blood tests every year. I take these anyway every year and they have always been in the centre of the correct range for my age. It is pretty hard to keep anything from my DAME, she is also my GP.
  5. Geoff_H
    I just recieved my 2 year Class 2 medical. Only eye correction required, another story altogether. But they require that I do a yearly heart stress and ultrasound etc. I do a two year test anyway, and the latest test was that I could get to 116%heart rate. I am 75. Has anyone over 75 also got this requirement?
  6. Geoff_H
    Well my experiences with instrument control systems says that it is. 45 years of instrument control system work I was wrong it appears. When both ends of the shield are earthed a ground loop current can exist in the shield, this current can induce currents in the conductor it is shielding. Earth only one end of the shield and no current from earth loops appears. But I submit to your superior knowledge.
  7. Geoff_H
    Not quite sure of exactly what your system looks like but could be owing to am earth loop in the shield. A cable shield MUST be only earthed at one end or the conductor inside can get all sorts of funny voltages appearing. When RS 232/485 control systems were introduced I was a contractor and earned a tidy sum fault finding new installations. Most time it was because the installer had earthed both ends. A side cutter and disconnect one earth and bingo the control system fired up and worked.
  8. Geoff_H
    I have flown through there many times when I was living in Kalgoorlie. There are no places to land between Southern Cross and Kal. I had a door come open half way between the two and had to fly with a wind fury in the cabin for 20 minutes before I could land at Southern Cross. Flying through there at night means that your engine has your life in its hands.
  9. Geoff_H
    Over the years I have noticed so many marriage problems for aircraft builders. In the 1970's a friend was building a VP1. His wife left him for another woman. I have stopped building my own design because of the extreme hassles I was getting. Why do our partners object so strongly? Sorry if this is a little off subject. I hope things work out well for you PP. I am behind you all the way. Your craft will be great, you are putting a great effort into it.
  10. Geoff_H
    I am becoming very interested in building a D1. It has a retractable steerable monowheel with a tail wheel and small wing wheels. The way that I read this thos aircraft cannot be registered in RAA and the pilot needs a tail wheel endorsement. Am I correct in this?
  11. Geoff_H
    90% of the axial load of a bolt is taken in the first one and a half threads. A bolt with a lower modulus of elasticity make load 90% in a slightly larger number of threads. So lock bolt material would not worry me so much. But the galvanic action of dissimilar metals would worry me.
  12. Geoff_H
    Richmond hangars were sometimes available at Richmond but very difficult to be a pilot other than the airforce personnel . You will possibly have to let them rent your aircraft. I don't think that they use RA so that maybe difficult. I walked away from leasing the Mooney I owned as their lease requirements were unacceptable to me.
  13. Geoff_H
    I have used two nuts locked on a thread in the lathe and carbide tools to cut down nuts. This system keeps the tool away from the jaws and an expensive collission. I have also made nuts using hex bar in the lathe. Beware of cheap Chinese dies I have bought some online that don't cut a thread that will connect to a standard bolt. One fastener supplier that sometimes has the odd fastener is Lee Bros of North Parramatta they are an outside chance. But if you find that they have one I will buy it and post it to you.
  14. Geoff_H
    It is possible to get a fault tolerant control system. You need three control systems, if two systems agree then they can remove the third from operating. The third can be repaired with the system running and no engine output is lost. These systems are used where loss of control would be a problem. A company called August Systems (now taken over by ABB) designed the first of these systems for the US space craft. There is also a four control system that works slightly differently but just as effective.
  15. Geoff_H
    On the issue of using electronics to get more power out of aircraft engines. The foray of Porsche into aircraft engines proved a disaster. They had two alternates and two battery systems ( and a gearbox) as well as a system to detect if either system failed. They used diode auctioneering to get seamless changeover in the case of one system failing. The system was heavier than the Lycoming that they replaced in the Mooney. Having flown Porsche Mooney I must comment that it was the quietest least vibration light aircraft that I have ever been in.
  16. Geoff_H
    Yet I have worked on the design of gas turbines that had efficiencies that exceed that of Otto and Diesel cycles. They did have very very exotic and expensive turbine blades, and other expensive stystems. I have investigated problems on Trent gas turbines and they are very efficient, however they may work on a scaled down turbine for light aircraft, but they would be many orders of magnitude more expensive than the craft that they were powering.
  17. Geoff_H
    Sure if 2 seats is all that you want.
  18. Geoff_H
    Al Mooney was an aeronautical engineer during WWII. It is said that he designed the wings based on Mustang wings. They are laminar that makes climbing slower and descent quicker. I have heard of C210 vs M20J "races" the C210 beats the M20J in climb but the M20J surely beats the C210 in descent. I have had a descent fast enough to chill the engine, even with cooling cowls closed. With 2/3 the power of the C210 the Mooney does pretty well.
  19. Geoff_H
    I think that you are right Mooneys glide so well that the velocities come quite high on decent, so high that you can freeze the engine. Just read about it happening....Geoff
  20. Geoff_H
    What I needed when Landing my J Mooney was the gear down to get the speed washed off enough. I would do a short steep climb on entering downwind and when below gear down max speed, lower the gear then correct the altitude. The gear warning sound must not have sounded.
  21. Geoff_H
    Transmission lines have a steel core with aluminium strands around the outside. The aluminium strands are anodised to help them blend into the background to placate environmentalists.
  22. Geoff_H
    Just did some back of the napkin calcs ( if we can do it for the nbn we can do it for electrical cables). Ok this is just an interesting calc and many other issues come into play. I am not suggesting that this should be used for design, or poo pooing me😳. Units are not correct. For a given weight of 1kg the following resistances per square metre are: Aluminium 0.0011 Copper 0.0033 Iron 0.53 Silver 0.000163 Looks like silver leads for the starter motor (I am an engineer who said cost was an issue). But aluminium came in ahead of copper, now I know why transmission lines use aluminium, well there are other issues as well.
  23. Geoff_H
    Actually no. The male forms the flare, even if it is fractionally out the nut forces the aluminium to shape. Done with this tool I have 100psi air from my aircompressor sealed. It uses anealed aluminium and blue alloy fittings.
  24. Geoff_H
    My homebuilt tool adaption seems to work for me. If you buy a standard Bunnings 45 deg I can make a 37 degree brass adaptor if you wish.
  25. Geoff_H
    Other size is 45 deg. A square can be used to find the angle on the fitting
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