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Bruce Tuncks

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About Bruce Tuncks

  • Rank
    Well-known member
  • Birthday 08/08/1945


  • Aircraft
    jabiru sk
  • Location
    Gawler, South Australia
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  1. My suggestion would be to apply proof-loads before flying. Just make sure the proof-loads are not so high as to cause damage which was not there to begin with. Of course a big inspection before and after the loading. There seems little interest in proof-loading in Australia and I think the reason for this is due to the risk of damage during the test. As for the engine, surely its condition is not too hard to determine?
  2. I got a bit racist when in the USA. There was a billionaire starting a school for gifted kids in silicon valley. Selection was on the basis of an IQ test. But the billionaire insisted that the racial mix of the school reflected that of the contributing suburbs. Here's what happened.... If you looked white, no change to your score. If you looked chinese, 6 points were subtracted. If you looked black, 20 points were added. Now this is not really a racist rant, for all I know the top student was black. AND if you look at the olympics, why is table tennis dominated by chinese
  3. Yes onetrack, and I agree about the magenta line being a concentrating factor. That is good advice to stay away from it. With gliders, you also have thermals and clouds. This is why you have to wear a parachute for competitions , and they do get used from time to time. A Libelle once lost a wing outer ( halfway along the aileron! ) and the wreckage landed on a Narromine street. The unhurt pilot didn't even fly the task before landing. Harry Schneider kept that wing for the next 20 years in the hope of using it in a repair job.
  4. I once worked out that if 50 planes were flying at random over australia's wheat lands, there would be a mid-air once in 20,000 years on average. The workings included that the pilots were not looking out at all and there were no concentrating factors, like GPS tracks and airspace boundaries. Has there ever been a midair in Australia in the absence of concentrating factors ?
  5. I stopped using a 550 METRE farm strip because of discomfort. And yes the approaches were not the best. One direction involved coming in over the shearing shed, only 100m from a fence at the start of the 550m. These days, I use the town strip, 1000m of bitumen. What a wimp, I hear you say.
  6. I have wondered about skeleton spats for the Jabiru. the wheel is exposed, and the spat consists of a front and rear fairing . This makes pumping up the tyres easier and keeps the spat slimmer. They don't look good though. Anybody tried them?
  7. You could get Rotec heads for your Jabiru, RF, and try that.
  8. My son, the stuck-up Lancair owner, says struts cost 15 knots, but what would he know. When I sharpened the trailing-edge of my old struts ( yep, they were real round at the back), I hoped for 3 more knots but alas I can't see it. Later Jabirus have a different strut extrusion which is already sharp at the back. I have been told though that there is a law of diminishing returns on aerodynamic improvements so bugger it you can't do ten things at 3 knots to get 30 knots.
  9. Carbon is a lot stiffer than glass, and this is good and bad. With glass, the resin fails first and this gives a milky appearance to overstressed areas. Not so with carbon. Carbon dust also kills you faster than glass dust. Carbon is biologically more active. BUT carbon is lighter.And stiffer. Modern big-span sailplanes have to use carbon or the wings would twist and muck up the spanwise loading. If you wanted to make a super fast Jabiru you could make cantilever carbon wings instead of the strut-braced glass ones. This would give you about 15 knots and cost about 30,000 dollar
  10. What I can't understand is why they are so bad at the quarantine stuff. In the olden days, they used islands... today they fly people in from india and give them only 14 days in a cbd hotel!. No wonder we are getting new cases all the time, then they do ridiculous restrictions on people who have never even been near a covid case.. I bet if they used islands, or remote camps, and had an extra 2 weeks spent in quarantine without contact with new arrivals, we would be clear of the virus by now.
  11. Alan, you are doing the right thing by getting the issue up front. Just how they can say that your insurance is invalid if you made a claim that had nothing to do with the strip is beyond me. Personally, I don't believe in insurance. I would rather pay the premium money out on building a fireproof etc house.But that's just me. I know of others who have had a great response from the insurers. The Alice Springs Gliding Club comes to mind.
  12. Markdun, you are being a bit unkind to Cook. He was able to navigate using the lunar angular distance method for longitude. There were only a few people in the world at the time who could do the maths. I sure can't.
  13. Wow spacey, those railway guys took it too far I reckon. But oil-testing is an example of how the newer maintenance systems are just as rigorous as the old ideas were. Mike Busch uses oil analysis to detect aero engine problems a long time before any symptoms show up say on a leakdown test. Alas, Jabiru engines do not have the database to use oil analysis, or so I have been told.
  14. I have wondered about "gull-wing " baffles on the top of the cylinder walls and heads. Following the Limbach example, I put these on the underside of the cylinders, with the idea of keeping air in contact with the fins for longer. Now I am thinking of swapping them to the top or adding them to the top as well and having both top and lower baffles. Any comments?
  15. It's not quite that simple Onetrack. Waddington's stuff was top secret, and it was the 1970's fuel crisis which led to the rediscovery of reliability centered maintenance. This rediscovery was quite independent of Waddington. I would guess that his work is still unknown to our airforce. But I do have to say that in looking through the Jabiru maintenance schedules, I cannot find much unnecessary stuff, and this supports your argument. Maybe replacement of filters and spark plugs, but as stated earlier, the factory has little choice but to assume the worst possible operating conditions.
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