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Siso

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Everything posted by Siso

  1. Siso
    I reckon, back in the day they use to put carb in a box and pressurise the box. The floats would have neded modifying.
  2. Siso
    As I understand a Cessna 172 came out with 180 hp verses the 5.7 in the VY commodore was about 320hp. You could derate the commodore to 250hp and still be ahead. I would think the V8 would be slightly heavier and would need a redrive. Looks like the commercially redrives are fairly expensive. You wouldn't need to allow for stress of the slip the foot of the side of the clutch pedal on some good bitumen either.
  3. Siso
    Flight completed on Saturday 24/1 in a 20m sail plane.
  4. Siso
    Head gasket problem solved. https://en.wikipedia.org/wiki/Junkers_Jumo_205
  5. Siso

    Tyre Pressure

    Siso posted a topic in Thruster

    Hi Everyone. Just wandering what tyre pressures everyone runs in their 2 seat Thrusters? What sort of tyres do you run? (tail dragger)
  6. Siso
    I reckon there was an australian drag engine manufacturer in the 80's that did the same thing. No head gaskets to blow. Were the early merlins the same?
  7. Siso
    Not bad for the early to mid 30's though
  8. Siso
    Windfarms have underground cables and it is a regular occurrence, mainly at the joints. It has been suspected that as sometimes the cables are running flat out and than not carrying anything at other times the heating and cooling cycles cause the cables to grow and contract and the joints the weakest point. The cables had 3 phases in them and the joints heatshrunk? together. We ended up splitting up the cables for several metres at the joints and mounted each phase a metre or so apart to a frame underground. This seemed to fix the problem as we only had one failure in the last 6 or 7 years I was there. There a transmission lines in Australia that run up to 500kV. Portland Vic heading back towards the coal fired stations. 132, 275kV are the common ones.
  9. Siso
    On a normal disc brake caliper the square section o'ring pulls the piston back because it twists a bit when the piston moves through it.
  10. Siso
    Realistically to stop this we need to start putting some CEO's in prison (general population). We are told they get the big bucks because the buck stops with them. Qantas selling seats on cancelled flights, banks selling policy's to dead people, Woolies claiming specials on things at the standard price. These fines they are getting are budgeted for in the cost of doing business budget.
  11. Siso
    heres one of them https://world-nuclear.org/information-library/nuclear-fuel-cycle/nuclear-waste/radioactive-waste-management , Its not had to fine plenty of sources. still waiting for the dirty bomb source!
  12. Siso
    Madame Curie was around before they new what it was and safety practices weren't up to scratch. I would live next door to a power station in a heartbeat, more chance of getting run over by a truck than anything happening with a NPP, Source of information for making dirty bombs out of the long lived parts of the spent fuel please or is it from a movie(the peacemaker). X rays and gamma rays aren't the same thing. We work with stuff everyday that we should limit our exposure to. People get cancer from staying out in the sun too long. Easily researched from reliable sources on the net. end of discussion
  13. Siso
    The long lived spent fuel tends not to have gamma rays. After a few hundred years you would nearly have to eat it to be harmful. I wouldn't as it is still a heavy metal. The high gamma emitters tent to be short lived. Cobalt 60 is a gamma emitter and has saved more lives then it has deaths. It is used for medical imaging and industry. half life of 5.27 years so after between 40 and 52 years it has decayed to pretty well nothing. 7-10 half-lives depends who you ask.
  14. Siso
    Natural reactor at Oklo in Gambon, Africa( Illonois energy prof) found the fission products do no migrate far through the water table. Thorium and U238 have longer half lives so is that really dangerous. The longer the half life the safer they are. Remember we use to use Uranium for luminous dials and thorium in the old tilly lamps. (before you mention the radium women, we don't lick paint brushes used on oil based paint or used in parts washers either. Cyanide, arsenic are dangerous forever but we don't panic about that for people to find in the future. Some fission products become harmless after some minutes. Might be attributed is a pretty broad statement. A lot of the publics perception is a fall out of the cold war among older generations that went through the cold war. I use to think the same.
  15. Siso
    First 500 years and the high level really radioactive nasty stuff has decayed to less then when the uranium came out of the ground. The rest is not very radioactive, hence the long life. This can also be used as fuel for a fast reactor when they come on line. Uranium and Thorium is still radioactive bur we live with it as it is long lived. I have thorium in the shed(tig electrodes). Information easily found on the net. We should be using the term intermittent renewables as that is what Australia is trying to use to get to net 0. Our approx. 7% hydro is not really going to help. Country's that claim they are really are near net 0 have at least 70% or more traditional hydro. Norway, Quebec.
  16. Siso
    We will see unfortunately! Spent fuel is slowly getting less radioactive heavy day. After a few 10 of years the radioactivity has dropped a lot and is more easily handled. Political/public perception problem, not an engineering one.
  17. Siso
    Not sure they a fixing it. 2030 looks like coal is on par with intermittents plus storage, even with their stupid coal description being on a greenfield site with the most expensive coal plant they could find. Not a coal fan but makes you wander what else they have been misleading about.
  18. Siso
    Anyway you can do it without subscribing to a yearly one
  19. Siso
    How do you donate?
  20. Siso
    The advantage of the aircraft derivatives for power generation is their extremely fast starting.
  21. Siso
    The company I work for have some Olympus (concord) gas turbines and have no gearbox. The engine is used as a gas generator and they run another turbine in the exhaust stream that connects to the generator.
  22. Siso
    How do you go about parts for the 503 like a crankshaft as Rotax no longer supply parts? I believe Rotax don't want them pressed apart and rods and bearings replaced. I don't think there would be enough room for an endoscope to do a good inspection of the big end rollers and journal.
  23. Siso
    Does anyone think that RAAUS would do some work on sorting making it easier to replace the 503 and 582 on high drag ultralights now it seems they have the airspace access and heavier MTOW sorted. While these engines can be rebuilt, I would be worried about the condition of crankshafts (roller bearings) which don't seem rebuildable. (parts etc) Seems like the current process at the moment will price these aircraft out of existence. Is it possible to build a Drifter or Thruster out of second hand parts and call it home built? (19 reg)
  24. Siso
    Good for domestic, has large limitations for industry, jobs for our kids etc
  25. Siso
    Can you just drill a small hole in the top of the perspex and see what happens.
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