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Old Koreelah

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Everything posted by Old Koreelah

  1. Old Koreelah
    Bruce think about it from the air’s point of view; it’s rushing in at high speed and expected to suddenly change direction and slip down thru narrow orifices to cool all the hot bits. Gull wings below the barrels seem to be sensible, but probably best to make them enormous, to hold cooling airflow close to the hot metal for as long as possible, but always allowing that rocket-nossle-shaped outlet underneath.
  2. Old Koreelah
    A lot of assumptions there, T88. This is an enormous continent, with many flyers far from ATC. How many of us would appear on Air Services radar?
  3. Old Koreelah
    We have become very dependent on the latest hi-tech gizmos, all of which are vulnerable to interference by bad guys. It would be prudent to keep some of our proven, older technology available as long as we can. On a parallel tack, the current Covid crisis has severely disrupted world trade and shown us how dependent we have become upon global supply chains. We often hear of how desperately backward things are in North Korea, lots of Africa PNG, etc. True, but people there have had to be much more resilient and self-reliant than us; they are likely to cope with the next big global disrupted far better than we will.
  4. Old Koreelah
    Bruce has mentioned Lithiums, which because of their much lower weight, are attractive for aircraft. I tried small AGMs for several years and found them only just up to the job, especially in winter. When I fitted a LiFePO4 (which claimed a 400 CCA rating) I also fitted a PowerMate regulator which seems to have mated up well with this battery. As Bruce says, a lithium may not be a drop-in replacement for a LA battery; the charge regime is different and their much lighter weight may cause you CoG issues. Besides its very light weight and ability to keep its charge for months even in the cold, Lithiums are attractive because of how they deliver their power; on cold winter mornings my Li battery cranks incredibly slowly, like its flat. After a few seconds the cranking rate picks up as it warms. That gentle start is kind to Jabiru flywheel bolts, but re-starting when it’s hot is not.
  5. Old Koreelah
    I still have every computer I ever owned and most still work (they’re Macs). Nor me, but one day the screen will go blank...so I recently did a proper job of swinging my compass and now it’s pretty much spot on.
  6. Old Koreelah
    When people drive down to the beach, the crocs call it Meals on Wheels.
  7. Old Koreelah
    The first fax was sent in the 1860, but it took a while for the technology to spread.
  8. Old Koreelah
    It was a joke.
  9. Old Koreelah
    We have a TV from the 1960s, in good working order, but these days the picture is a bit washed out. The point of my post was that we have mobs of workable gear which is routinely tossed out as new technology is introduced. The new stuff is much more prone to hacking. I know of container-loads of emergency service radios which were destined for the tip, yet might be a lifesavers in the very likely event that our new digital networks are attacked.
  10. Old Koreelah
    Our local airport is one of the few still with an NDB beacon. We also have a rare old type of PAL unit. Both are way past their replacement dates. Is there still a role for this Stone Age gear? Criminal gangs and foreign agencies have demonstrated that they can disable our fancy high-tech stuff at will, paralysing companies and whole industries. Is it wise to throw out old, still usable stuff?
  11. Old Koreelah
    The Thruster I mentioned has been sold.
  12. Old Koreelah
    Who, me?
  13. Old Koreelah
    I’m just now at airport and took a pic of my hottest head:
  14. Old Koreelah
    Hope you’re right. Over the years I’ve followed the various factory announcements about modifications, including throughbolts, deeper nuts, etc. and read all the counter views…then done nothing. Regular oil and filter changes, managing head temperatures, avoiding shock cooling and feeding it clean fuel have served me well. The head metal inside the tapper compartments is still a healthy colour and there is no evidence of fretting or oil leaks.
  15. Old Koreelah
    A neat laminated prop:
  16. Old Koreelah
    Glen this topic could take up a whole thread. A lot of people have made their own cooling setups for Jabs. I know of one bloke who painstakingly refined the interior of his ducts until all CHTs were even and safe. The factory is reported to have tried traditional plenums and decided their fibreglass ram air ducts were better. I like the ability of fibreglass to mound closely to engine contours to minimize leaks. The forum had a pic of a neat one which encase the whole top of a Jab engine (just wasted half an hour trying to find it). My fourth version is sheet aluminium and encases the spark plugs and brings cool air to the whole length of the steel cylinders. On climb out the hottest CHT sometimes nudges my 150C alarm, then stabilizes between 130-140C on cruise. Ground testing with my multimeter probe makes me reasonably confidant of those numbers.
  17. Old Koreelah
    The sock is usually near the centre of most airports, so it might be far off and hard to see during your final approach. Another reason to have a bit of reserve energy up your sleeve in case of unseen wind gusts.
  18. Old Koreelah
    I guess that’s why several laminates are normally used.
  19. Old Koreelah
    A fearful situation, Nev. Rotax engines seem to have in-built protection against the engine being ripped out by massive out of balance situations- their carbs are not clamped on and just fall off, stopping the engine pretty quickly. I have a rough approximation of that: a cable around my carb designed to rip it off if the engine moves too much. Might work. Nice to know.
  20. Old Koreelah
    I’ve read other accounts that the Japanese had in the order of ten thousand aircraft, but not necessarily all operational. That’s the conventional justification for the use of A bombs, but a much more plausible version challenges this. The US firebombing of Tokyo and other cities killed far more than the A-bombs did, so the the loss of two more cities did little to convince Japan’s wartime leaders to throw in the towel. What really got their attention is when the Soviet Union declared war; years earlier Zhukov had inflicted massive defeats on Japan’s army and they knew that the Red Army was now a massive, unstoppable juggernaut. Worse still, they knew what the Bolsheviks did to the Russian Royal family. Surrender to the Americans and their allies was preferable to a Soviet invasion that would have deposed and possible killed their beloved emperor.
  21. Old Koreelah
    Off Topic: The Trump Presidency - an analysis
  22. Old Koreelah
    The Trump Presidency - an analysis
  23. Old Koreelah
    My windscreen is overdue for replacement, but the other bloke flies from his black soil strip. Other members were grounded by the recent rain, but he has big wheels; quite a bit of his farm ends up stuck to his plane.
  24. Old Koreelah
    I saw a neat fibreglass prototype single seater in the Jab factory at least a decade ago.
  25. Old Koreelah
    This morning Quirindi Aero Club had a long-planned Open Day to shake a few would-be flyers out of the undergrowth. A small investment in radio and newspaper advertising brought several new faces to our monthly BBQ breakfast. Visitors got to talk to pilots and inspect the variety of aircraft that had flown in. Several also went up for a TIF around the district. We had three instructors in attendance, flying a Sting, a Tecnam and a Cavalon gyro. In the crisp morning air the heated seats of the Cavalon and Sting were a big hit. It looked like aviators are becoming soft, but this was offset by a hardy young bloke arriving in an unfaired, open gyro after flying an hour from the west. He wouldn’t let go of his hot cuppa. At first light I flew east to video the snow on the hills behind Wallabadah; my dodgy efforts are below. Meanwhile another member did a much better job of capturing 693FA2F8-8A27-4FC0-9F17-AB120B562283.MOV IMG_0402.MOV IMG_0402.MOV 693FA2F8-8A27-4FC0-9F17-AB120B562283.MOV the snow-covered Liverpool Range to our south.
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