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Geoff_H

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Everything posted by Geoff_H

  1. Geoff_H
    Never tried the auto adjust features. I always watch the first layer very carefully and adjust as required to get best bed adhesion. I manually adjust temperatures during the print, I should put the changes in the GCode. I must do this one day. I spend heaps of time watching the print.
  2. Geoff_H
    Yes. The temperature is destroying my Teflon guides, but I have a metallic hot end on the way. One of my big problems was curling and separation of the part from the bed. I did some bed temperature measurement and found that the bed temperature was between 20 & 30 deg C below the measured temperature. Getting much better results now. Only nylon has the temperature strength and chemical resistance required. Early parts split along laminations when hit with a hammer on the vyce. To get better built quality I am building a thermal box for the printer
  3. Geoff_H
    I noticed in another thread that a discussion on 3D printing came up. I have been experimenting with printing various parts for my project. I have found that the weakest part of a printed part is the layer bonds, hence I would not use it for undercarriage parts, but for throttle quadrant rudder pedals and the like it seems to be OK. Weight is significantly lighter than aluminum parts owing to the lower density and 'honeycomb' style centre. The minimum material that could be used is nylon. Printing nylon is not for the faint hearted with much experimenting to get an acceptable product, dimension and surface finish often lead much to be desired. However my products are getting better as I solve each problem. I have had to modify my printer several times to improve the part quality. I designed each left using 3d AutoCAD then transfer the design to an appropriate language for the printing, quite cumbersome. With time I expect to be making parts that can be service sensitive in requiring strength and endurance. Maybe undercarriage parts one day.
  4. Geoff_H
    Hi Lighspeed, I am about to start cutting foam, if you're interested maybe you would like to come and have a look. I need someone to help with the hot wire cutting, wife is not the technical type. She doesn't like flying but to her credit we saw most of Oz in the Moon when we had it.
  5. Geoff_H
    OK but am at the late design stage. It will be fibreglass and foam. I am busy making templates and trying to 3d printer rudder pedals/brakes and just blew up my 3d printer.... very sad at the moment.
  6. Geoff_H
    I am not so sure. They are stressed to aerobatic levels. They are very strong. They also pioneered an aircraft foam and aluminum construction.
  7. Geoff_H
    My project at the moment is a Cri Cri like aircraft. I looked into using the model aircraft jets. They have a very low "compression ratio" indicative of a cheap compressor and hence are very very fuel inefficient, very short range. I am using 2 Hirth single cylinder engines. And also a Steel/Kevlar rollover bar.
  8. Geoff_H
    In a "dirty" Aircraft the difference between gear up and down is small and the weight of retractable gear ends up making only a small speed gain. However in the Mooney, a very "clean" aerodynamic aircraft the difference was significant. Had a gear retract problem once, gear down and the craft could not get above 120 knots, gear up it got 165 knots. OK, if it were to be fixed gear the gear doors wouldn't be a drag etc but retract can make a significant difference.
  9. Geoff_H
    Some years ago I read of a similar study in Great Britain. Theirs was 1 every 400 years, smaller country more aircraft. However near an airport I believe that the probability increases greatly for obvious reasons.
  10. Geoff_H
    I once was contracted to a large engineering consultancy. They are stock market listed and make very large profits. 'CASA charge more per hour than they do, is 'CASA very inefficient or are they returning high profits to the government coffers?
  11. Geoff_H
    I damaged an aircraft once. It turns out that unless you're actually advised that you will have to pay this excess you do not have to pay it! I did but any writing on the back of the hiring agreement does bind you for anything unless you have it pointed out to you and you agree.
  12. Geoff_H
    I have just had the same stupidity. An ultrasound showed a benign cyst on my kidney. Most people my age have them, been flying over 40 years. I had to go to a urologist and spend $200 to get a letter that said they did not affect me or my flying. The urologist found it difficult to understand that CASA did not understand that they are common and pose no problem, I had to tell him it was just CASA! With trivia like this no wonder they take ages to assess medicals. Talk about take no responsibility for their job, just charge a fortune for little responsibility.
  13. Geoff_H
    Totally agree. Only like aircraft that I Vulcan look at very closely or that I can fly or be flying in where I can be in close contact with the person flying it.
  14. Geoff_H
    All that you need now is to fly a Mooney and your aviation experience will be complete
  15. Geoff_H
    All low voltage audio cables need to be shielded. The shield MUST be rather at ONE end only. If not you can get earth loops, they will be at a multi of the engine frequency, usually double.
  16. Geoff_H
    I have had one overdue for 10 years, kept my medical up to date. Did an Aus medical in Houston TX during that period.
  17. Geoff_H
    Yes I have just past my medical, well maybe, DAME renewed for 2 months, calcium score so high i need a cardiogram. My cardiologist says I may need yearly medicals. At $300+ cardiologist fee I am reassessing what my flying should look like. Is NVMC worth it to me? I want to do aerobatic flying one day, but if I do eventually get to is probable at the moment. I am trying to assess what I do. I have not flown at night for 18 months.
  18. Geoff_H
  19. Geoff_H
    Please help me! I do not understand the licencing system for other than GA. Can anyone assist me in a quick description of the "Licence" and its privileges? I have Night VMC and hope to do aerobatics in the not so distant future, how do I get an RAMPC?
  20. Geoff_H
    I have never understood the stupidity of the PPL and RPC (if I have the terms correct). Lets take a Corby Starlet, I only have a PPL, if it has VH- painted on it I can fly it, if it has numbers only I cannot ...mmmmm. Do numbers make it hard to fly? If low wing loadings are so difficult to fly (and some are) why not make a single licence and rating for minimum stall speed? Why have a medical for PPL that costs around $300/2 years when an RPC needs only a drivers licence? Why will it take me 5 hours of flying to fly an aircraft similar to a C152, the aircraft I learned to fly on? Before flying one these days I would get a few circuits with an instructor, I have been only flying high landing speed aircraft for the last 10 years.
  21. Geoff_H
    Don't do Cessnock, safety is not the best and they expensive. Maitland is nearby and a much better airplane the people friendly.
  22. Geoff_H
    I think that a carby temperature gauge should be a highly considered item if you do not have effective carby heat for any aircraft. I calculated that my little 15HP engines need 400Watts of heat to counteract the evapourisation cooling of fuel at full fuel flow. I am trying to work out a way of getting that much heat into the carby throat. Any ideas anyone? But on the changes to the fan cooling I would do a weight and balance check after modifications to see that the CofG has not moved significantly. A movement rearwards will reduce aircraft stability, albeit I would expect only slightly, but its an easier ground check than an in air check.
  23. Geoff_H
    Flying is the second greatest thrill known to man. Landing is number 1
  24. Geoff_H
    Flying is the second greatest thrill known to man. Landing is number 1
  25. Geoff_H
    Hirth recommend that BlueMax is used in their two strokes, they sell it as does Recpower in the USA. I think it must be infused with gold from the price (LOL). However Hirth will tell you that the oil must me API TC rated. DEFINITELY NOT the cold water cooled stuff which I think has a W in the API rating.
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