Geoff_H
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Everything posted by Geoff_H
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Thinking about the fatigue in aircraft brings another question to mind. The designer of the Cozy IV stated that composite fibreglass does not fatigue. I don't know that I believe him. Anybody know anything about composite aircraft fatiguing?
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There are several kits to build your own EFIS at home. There are also EFIS' for your smartphone. Anyone have any experience in any form with these?
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Steel has a stress level below which fatigue does not exist. Aluminium does not have any point at which does not fatigue. The design level is statistically derived with a nice safety margin....however is your aircraft aluminium as per design? Inspections are important. As Nev commented salt erodes aluminium and I think that it reduces the fatigue failure points (not sure).
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It is not the wires melting that the current rating is based on it is the maximum temperature that the insulation can stand. With the Tefzel wire (a Teflon like product with less lethal gasses given off in a fire), you can use a smaller gauge wire, a weight reduction. Digital signals don't require a high current, not even the power supplies, but you never know what will go wrong. Murphy was an optimist!! I would never again solder, I had so much trouble, even with heat shrink, then I was told to crimp....now I always crimp. Only use non oxidation gold connection. In my younger days we carried ink erasers to clean dirty signal connections. Gold was a saviour. No good getting a failed digital signal for lack of quality connect systems.
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I think that you are right Nev. I should have researched a little more. I was so pissed about my car I was on the verge of demanding my money back when they fixed it -
When I picked up my car in 2019 the 3G and GPS were interfering with each other. Data was being stopped and the GPS had me in the middle of McCarrs creek. The two antennas are in the only little enclosure at the rear of the roof. Overseas did not have this problem, so they said. In Australia we often use the lower end frequencies of 4G as their range is better, especially near where I live. Well some Germans came out with a lot of test gear and it looks like the problem is solved. The FAA is worried that 5G will interfere with their GPS equipment as I believe that the frequencies are very close.
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My Mooney had gap seals. They appear to work very well.
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Flying a 19 reg Jabiru with a ga license?
Geoff_H replied to Bruce Tuncks's topic in Governing Bodies
I sure do. 74. It was Matt Hall's dad that tried to make me sick with aerobatics. Never a moment of sickness, loved every second of it. -
Flying a 19 reg Jabiru with a ga license?
Geoff_H replied to Bruce Tuncks's topic in Governing Bodies
I had a ride in vh+FTA doing aerobatics not that long before the accident. -
I know, I needed a very small amount for rebuilding a compass. That was the only size available in WA at the time. Seems a waste to just throw it away.
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A little off track of this conversation but I have a bottle ( one litre I think) of compass oil free to a good home.
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Flying a 19 reg Jabiru with a ga license?
Geoff_H replied to Bruce Tuncks's topic in Governing Bodies
Light or not so light that should be 😒 -
Flying a 19 reg Jabiru with a ga license?
Geoff_H replied to Bruce Tuncks's topic in Governing Bodies
I learnt on a C150, flew aircraft from C150 / 6 seater retractable through to Mooney and most recently a C152. What a lot of BS that you can only fly light or heavy. I am sure that I could fly a single seat 500lb craft. Backed off from buying a Teeney Two after a report of flying them as being a " religious experience". -
When I was consulting to the mines a good friend was doing velocity surveys for wind power. He said wind cost 4 times gas turbines. Never quite sure what he was about but he did say it was an expensive installation (interest on investment?,) And you still need to have a gas or diesel power plant. The overwhelming amount of energy is in trucks and loaders....a solar panel on the roof of the trucks, or maybe a wind turbine? One panel in a sunlit day produces enough energy to drive a Tesla 4km. 5MW motor on a dump vehicle may be just too much LoL
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Sorry left a zero out, should be 30,000,000 litres of diesel. Getting old and forgetful lol
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One of the biggest carbon emitters are mines! One particular iron ore mine, a confidentially agreement prevents me from disclosing much) burns 3,000,000 litres of oil per month. Hydrogen powered machinery would prevent this diesel/explosives from emitting. There must be many mines also with high emssions. Most electricity is from burning natural gas from the pipelines in gas turbines (hence my involvement).
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I have worked in WA and met a few people that have worked with Twiggy. He is a great guy and is truly interested in the community. His grandfather Lord Forest was a great guy also, he did a lot to develop WA. He doesn't have an office he sits in a big room with all other employees. He does huge effort promoting the aboriginal.peoples lifestyle.
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It looks like Twiggy is backing hydrogen. Liddell power station has been making hydrogen by electrolysis since the 1971. Just a much larger scale.
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I worked on designing a 185MW gas turbine in Florida. Highest aircraft jet/ turbine is 70 MW. I must admit that our blade technology was from Pratt and Whitney under licence. We had many more stages and ran at 3600rpm with a single shaft. Big external burners. Well the principles are the same. Worked on an A380 Rolls Royce in the outback, gt part fantastic, the way rolls Royce converted it was an absolute shambles. Every install in the world had big problems. Aircraft GT's use the same principles, but the ones over approx 70MW are very different. Below 70MW much similar.
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I am not sure that I agree with whoever wrote that. Porsche guaranteed the cost the same as Lycoming and 10 year fixed price overhauling. I remember their advertising before they were introduced. Mooney sell because they are fast. Slowing down a Mooney is its death nell. Mooney were going broke in the 70's by stripping down their aircraft to compete with Cessna Piper. They were losing money. A Mooney owner bought the company designed the J model with the instruction that any engineer that made a design that lost 1 mph was fired. Cost increment did not matter.
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Liquid fuel would be delivered to the engine (gas turbine jet) and demand and evaporation done in a similar way to spacecraft engines that use hydrogen/oxygen fuel.
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"plus a containment vessel which needs to be spherical/cylindrical so it the wings are no longer a good fit." not at all if the tank pressure is atmospheric and the hydrogen is at saturation temperature! But the smaller the surface area the less insulation needed.
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The one car engine that was rebuilt as an aircraft engine was the Porsche. One control " how much power do you want". Mooney fitted them to new aircraft as an option. However as it needed two alternators for electronic reliability and a gearbox it was heavier than a Lycoming of same HP. The Porsche model was slower than the Lycoming model. Who buys a slower Mooney... not many people. So upon its failure to sell any great numbers Porsche refitted most aircraft with Lycoming engines. I had an unconfirmed report that only 5 Mooney Porsche still exist. I had the pleasure of flying one over the top of Melbourne. Sheer delight. Very quiet. A great product failed by marketing problems. I feel that we are in for a similar situation with having to go "green".
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For a continuing flight the aircraft could use the boiloff in the APU. Defuel between longer flights. I don't see a need for a second tank. Fuel tanks would be in similar places to existing tanks. But with very good thermal insulation. I have worked on control systems design of two hydrogen plants, one using methane conversion the other electrolysis, never on liquid hydrogen but have worked on control systems for liquid oxygen/nitrogen plants. I expect that there would be difficulties but one has to be open to brain storming to advance technology.
