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Nobody last won the day on September 14 2015

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About Nobody

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  1. The girl has sued the pilot. I suspect that his insurance company (RAAus liability insurance?) don't want to foot the entire bill and so are looking for someone to share the cost hence the pilots insurance co. is suing the council.... The pilot has to be a part of the proceedings otherwise his insurance co. wont pay out to the girl and he will have to personally pay. Subrogation https://www.investopedia.com/terms/s/subrogation.asp
  2. Yes the engines theoretical maximum efficiency is the diminished by a hotter intake but that is only past of the story. The theoretical efficiency of a heat engine with a hot temperature of 1000k and a cold temp of 300k is 70%, Our aircraft engines are only about 30% efficient showing that things like friction, heal loss to the cylinder wall and pumping losses are very significant. Increasing the hot temperature by 30 degrees celcius to 330k would drop the theoretical maximum efficiency to 67% but the in many instances the real achieved efficiency is higher. The attached table is from the Cessna 182S POH, the yellow highlight is mine. This is for 2000 feet pressure altitude. From the table at 2400 RPM and 21 inches of MP the power output is 67% and the fuel flow is 11.8 GPH when the temperature is 20 degrees below standard. If the temperature is 20 degrees above standard and the engine setting remain the same then the power drops to 63% and the fuel flow to 11.1 GPH. If we increase the MP to 22 inches to produce the same power as when the temperature was cooler the fuel flow has dropped to 11.7 GPH. This table suffers a little from rounding, it is only for a whole inch of MP and so sometimes there is no change (and for one or two instances the pattern isn't born out) but generally this shows that higher temperatures result in less power but more efficiency. Now 0.1 GPH isn't a lot but for the long distance record breakers that can mean the difference between claiming the record or having to divert and make another attempt.
  3. To do the test well you need to somehow have the same output power from the engine under the two conditions. The hotter test will need the throttle to be slightly more open to produce the same power.
  4. It runs best from a maximum power out point of view on a cold day, but the ammount of fuel required to generate that power is high. It is more power that makes motorbike or car feel better. To know that the fuel consumption is higher you have to do detailed measurements and so it is harder to determine the influence of higher intake temperature on fuel consumption. Search for brake specific fuel consumption(BSFC). Or perhaps the EFI means that the mixing of the fuel and air is better reducing the benefits of having a system of heating the intake air.
  5. You need to make the distinction between maximum power and maximum efficiency. Maximum power is what we need to takeoff to get off the ground quickly and away from the tress at the end of the runway. In that situation cold air to the engine increases the power output. Once we are in cruise we no longer need maximum power and we throttle back. Now we are concerned with maximum efficiency. Warmer intake air increases the engines efficiency, lowering the the required fuel burn for a given amount of power. Some of the very long distance flight done in the long Eze's were done with a little bit of carb heat applied in the cruise, not to ward of icing but to improve efficiency.
  6. The FAA have this fairly useful AC on water in Fuel. It does cover both Jet and Avgas so not all of it is applicable to our aircraft. https://www.faa.gov/documentLibrary/media/Advisory_Circular/AC20-125.pdf
  7. Nobody

    Killer Gas

    Many EFIS systems have a spare input to allow custom warnings and alerts. I have seen a CO detector hooked to one of these so that the warning comes up through the headset/radio and shows on the screen.
  8. Nobody

    Killer Gas

    The density of air is 1.184 kg/m3 at 25 degrees C and atmospheric pressure The density of Carbon Monoxide is 1.145kg/m3 at 25 degrees and atmospheric pressure. While people have been killed by CO down mines it isn't because it is heavier than air and sinks to the bottom.
  9. Nobody

    Killer Gas

    CO is slightly lighter than air but for most practical purposes the density is the same.
  10. In the USA the usage is affirmative, refer to the FAA Pilot Controller Glossary: https://www.faa.gov/air_traffic/publications/media/pcg_basic_chgs 1_2_9-13-18.pdf In Australia it is Afirm as per the the AIP posted by head in the clouds. Footpath or Sidewalk?
  11. Guys, This is all about the politics of Controlled Airspace Access and a higher MTOW. Did you note that RAAus are not providing information to any airport operator but only those that are members of the Australian Airports Association. CASA has a committee from the "industry" that provide advice to it on new regulations, called the ASAP. RAAus need that committee not to stand in the way of their request for greater privileges. The AAA won't endorse a regulation change that would result in their members not being able to send invoices to aircraft owners. RAAus's change in position is a quid pro quo for not opposing the CTA and a higher MTOW.
  12. Safety Directive on the ASRA website: https://www.asra.org.au/application/files/2015/4106/0199/AD_2018.01_TITANIUM_AUTOGYRO_TAG.pdf
  13. Its a good report but does leave a few questions unanswered. We don't know why the engine stopped. Even though there was a fire I would have thought that a disassembly of the engine would tell if it is was seized, or there was a lack of oil flow or anything significantly broken internally. What was to position of the ignition switches, fuel selector? This quote from the report is chilling, I wonder if as part of the pre takeoff checks out of habit Ross turned the fuel to the engine off? Mr Millard climbed into the aircraft, secured the harness and discussed matters with Mr Lowry including the position of the fuel selectors which was different from the Lightwing that Mr Millard owned and flew.
  14. Nobody

    Cri Cri

    there were photos in the thread back in 2015 so it has been flying for awhile. Miniture high speed turbine engines
  15. We all knock the media when they report a "cessna" has crashed so perhaps RED you could edit the thread title. CASA haven't determined anything, the ATSB have.