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Geoff_H

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Everything posted by Geoff_H

  1. Geoff_H
    I think that the dipping in the paint is a great idea. Just be careful that your favourite colour may fail because the paint carrier that disappears on drying is conductive. I would not expect so but I am not really certain what is in the carrier.
  2. Geoff_H
    Yes a good quality Meyer with a very high input resistance would probably indicate a conductive paint. A Fluke or equivalent meter, not a cheap Chinese one. First measure the substrate, without any paint, push the probes as hard as possible into substrate. The resistance should be infinite. Then paint the surface, at dry remeasure in the same spot, if the resistance is less than infinite do not use that paint. I have made a resistor by mixing black carbon ochre with epoxy. When set I could measure resistance across the part. Another was is to download an RF Meter on Apple/android and see the effect of putting the phone in a painted box. Geoff
  3. Geoff_H
    Recupetators weigh! Stationary engines of larger size don't use them because of pressure losses in exhaust gas, pressure loses affect turbine output.
  4. Geoff_H
    I worked in Florida on the design of 185MW gas turbine. The efficiency of a gas turbine depends heavily on the maximum turbine first row of blade temperature. To get high temperatures you need very exotic blade materials, as a rule of thumb the more you pay the better the efficiency. These people are getting better efficiency by using heat from the exhaust to increase the volume of compressed air so not so much fuel is used to get to maximum temperature. It is used by a company called micro turbines, small medium efficiency turbine manufacturer. I hope the guys are a great success.
  5. Geoff_H
    Carbon black paints are offer used as RF absorbers. Other forms of colouring may have been used on your GPS antennas. I would find out what pigments are used in any coloured paint and check the conductivity of the pigment before applying them else you create a Faraday cage.
  6. Geoff_H
    Aircraft are expensive and Beavers are very more expensive. Must be higher maintenance costs.
  7. Geoff_H
    When Garmin upgraded the GNS430 to WAAS they had to build a totally new processor board to make a GNS430W. It is a lot more hardware than additional transmitters to cancell out the noise in the receiver, it is apparently a whole new performance of processing hardware. I found this out after forming out $10k to have the processor board upgraded.
  8. Geoff_H
    Black pigment is often carbon, I expect that would attenuate significantly. White is titanium dioxide, I think that as it is an insulator and non conductive why every GPS receiver that I have ever seen is white
  9. Geoff_H
    The Garmin have don't paint on their body. I think that some paints can attenuate radio frequencies.
  10. Geoff_H
    The Dynan uses WAAS. Speed of operation is critical and I think that we use waas devices for speed of operation and other technical reasons I upgraded a GARMIN 430 to 430W for technical Operations reasons. Hence I have bits left over
  11. Geoff_H
    Hi Skip, well I was interested in augmenting my project withe a possible repair project, but a place to put the repair job plus a hostile minister of war has made me put my project on hold as she wants the house without any faults before I go on. I expect to only have an RAA licence by then hence my changingind engines to a single. I am not expecting to use many things including heaps of stuff for a quarter built cozy IV. I have given away a significant amount of stuff that I will never use, if I don't the other half will trash it all if I die first, she thinks that will make me angry, how could it I will be dead lol. Just a point that I expect that any GPS receiver will connect to your GPS if it uses the naval code ( and I think that most do). However if you get a non dynan make sure that it is WAAS. Geoff
  12. Geoff_H
    Hi Skippy I didn't realise your craft was composite . I also have a garmin one like the picture above ( but with plug fittings ) again hanging around. I think that it is waas. Let me know if you are interested. Geoff
  13. Geoff_H
    A comant CI 2480-201. Don't know if it would be comparable. But it is hanging around doing nothing for me. Let me know if you are interested. Geoff
  14. Geoff_H
    My project is composite. No need for it
  15. Geoff_H
    It is sitting in my workshop. Very cheap to buy
  16. Geoff_H
    Don't forget that that CofG must fall within the triangle formed by all three wheels (or skid). As well the distance between the Cof G and the main wheels axle can affect ground handling The spitfire and one of their German counterparts have been reported that theain wheels were as too close to each other and increased difficulty of ground handling.
  17. Geoff_H
    At the end of the day the location of the CofG to the Aerodynamic lift centre has to be the same either configuration. There maybe some different moments on the aircraft owing to nose wheel drag, just make sure that at landing speeds these are easily compensated by available tail moment
  18. Geoff_H
    Hi Skippy I have a dual VHF/GPS antenna. I bought it but it did not get into the air. I upgraded to WAAS. This is not a waas antenna. Let me know if you are interested. Geoff
  19. Geoff_H
    The Mooney I used to own had been flown to Australia via Canada, Europe, down through the middle east and India, Indonesia, new guinea and Darwin then down to Perth.
  20. Geoff_H
    Some years ago the Mooney club was looking at flying to New Zealand. Port Macquarie to Lord Howe to Norfolk island to top of North Island of New Zealand. We also considered East Timor but you can't get avgas there. I looked into shipping 44 gallon drums to their but our contact there was not interested in doing all the paperwork for the importation.
  21. Geoff_H
    I was once told to call "aircraft on final" at non controlled airfields!
  22. Geoff_H
    Trick them call VH-OQD on final. Lol
  23. Geoff_H
    Understatement. This is what happens when critical monopoly infrastructure is privatised. Look at roads, electricity, airports etc.
  24. Geoff_H
    I don't think that they want RAA, under
  25. Geoff_H
    From what I read on the internet it would appear that the 6 built were kits. I expect that there were no commercially offered plans just parts and a kit with assembly instructions. It did appear that the designer still lives in NZ, not sure.
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