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Geoff_H

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Everything posted by Geoff_H

  1. Geoff_H
    I have used two nuts locked on a thread in the lathe and carbide tools to cut down nuts. This system keeps the tool away from the jaws and an expensive collission. I have also made nuts using hex bar in the lathe. Beware of cheap Chinese dies I have bought some online that don't cut a thread that will connect to a standard bolt. One fastener supplier that sometimes has the odd fastener is Lee Bros of North Parramatta they are an outside chance. But if you find that they have one I will buy it and post it to you.
  2. Geoff_H
    It is possible to get a fault tolerant control system. You need three control systems, if two systems agree then they can remove the third from operating. The third can be repaired with the system running and no engine output is lost. These systems are used where loss of control would be a problem. A company called August Systems (now taken over by ABB) designed the first of these systems for the US space craft. There is also a four control system that works slightly differently but just as effective.
  3. Geoff_H
    On the issue of using electronics to get more power out of aircraft engines. The foray of Porsche into aircraft engines proved a disaster. They had two alternates and two battery systems ( and a gearbox) as well as a system to detect if either system failed. They used diode auctioneering to get seamless changeover in the case of one system failing. The system was heavier than the Lycoming that they replaced in the Mooney. Having flown Porsche Mooney I must comment that it was the quietest least vibration light aircraft that I have ever been in.
  4. Geoff_H
    Yet I have worked on the design of gas turbines that had efficiencies that exceed that of Otto and Diesel cycles. They did have very very exotic and expensive turbine blades, and other expensive stystems. I have investigated problems on Trent gas turbines and they are very efficient, however they may work on a scaled down turbine for light aircraft, but they would be many orders of magnitude more expensive than the craft that they were powering.
  5. Geoff_H
    Sure if 2 seats is all that you want.
  6. Geoff_H
    Al Mooney was an aeronautical engineer during WWII. It is said that he designed the wings based on Mustang wings. They are laminar that makes climbing slower and descent quicker. I have heard of C210 vs M20J "races" the C210 beats the M20J in climb but the M20J surely beats the C210 in descent. I have had a descent fast enough to chill the engine, even with cooling cowls closed. With 2/3 the power of the C210 the Mooney does pretty well.
  7. Geoff_H
    I think that you are right Mooneys glide so well that the velocities come quite high on decent, so high that you can freeze the engine. Just read about it happening....Geoff
  8. Geoff_H
    What I needed when Landing my J Mooney was the gear down to get the speed washed off enough. I would do a short steep climb on entering downwind and when below gear down max speed, lower the gear then correct the altitude. The gear warning sound must not have sounded.
  9. Geoff_H
    Transmission lines have a steel core with aluminium strands around the outside. The aluminium strands are anodised to help them blend into the background to placate environmentalists.
  10. Geoff_H
    Just did some back of the napkin calcs ( if we can do it for the nbn we can do it for electrical cables). Ok this is just an interesting calc and many other issues come into play. I am not suggesting that this should be used for design, or poo pooing me😳. Units are not correct. For a given weight of 1kg the following resistances per square metre are: Aluminium 0.0011 Copper 0.0033 Iron 0.53 Silver 0.000163 Looks like silver leads for the starter motor (I am an engineer who said cost was an issue). But aluminium came in ahead of copper, now I know why transmission lines use aluminium, well there are other issues as well.
  11. Geoff_H
    Actually no. The male forms the flare, even if it is fractionally out the nut forces the aluminium to shape. Done with this tool I have 100psi air from my aircompressor sealed. It uses anealed aluminium and blue alloy fittings.
  12. Geoff_H
    My homebuilt tool adaption seems to work for me. If you buy a standard Bunnings 45 deg I can make a 37 degree brass adaptor if you wish.
  13. Geoff_H
    Other size is 45 deg. A square can be used to find the angle on the fitting
  14. Geoff_H
    Skip I take it that your fittings are the 37 deg flare. I think that the blue aluminium fittings are.
  15. Geoff_H
    I have only single flared fuel lines. My 100 psi air line would benefit from double flare. One day I may make a tool for double flaring. What are others using on fuel lines? Maybe I should remake the fuel lines.
  16. Geoff_H
    Nice set of tools. The above set was made for copper. By making the adaptor piece o made the device work on Aircraft fuel systems including aluminium pipe and fittings. I made an adaptor system for my air compressor that uses aluminium tube and holds 100psi air. I like you set better, just like the cost of mine.
  17. Geoff_H
    My flaring tool. The brass piece is the substitute for aircraft angled flaring
  18. Geoff_H
    I made an appropriate flaring tool and using a Bunnings gas lines and in the lathe made the end bit at the appropriate angle. I have made an aluminium line for my air compressor, it holds 100psi air. I will take pics and post them if anyone is interested. Geoff
  19. Geoff_H
    That is my concern. The spard seem very thick and angled, is their construction different This is the part where the designer talks about the stability of the design and some interesting differences to the "conventional design" https://www.verheesengineering.com/delta-aerodynamics/
  20. Geoff_H
    Done that but the definition on the drawing has been lost. I actually know the wing span so I printed the drawing to fit on an A4 sheet, found the scale then scaled most dimensions. It is 8ft wide with wings folded up, found most other major measurements same way. So can guess the amount of aluminium needed, the website says "6061 or 2024" suggesting the craft could be made of 6061.
  21. Geoff_H
    The Facitmobile second generation design uses flat panels, similar to stealth aircraft, however the for simplicity of design in this case. The designer had worked for a company that designed the early stealth aircraft. Delta wing aircraft are reported to be simpler with very large cockpit volumes.
  22. Geoff_H
    Yes the D1 has a transparent floor to get better vision on landing. Tom Fink tried to teach me supersonic fluid mechanics, my results could have been better, but from what I remember subsonic and supersonic Delta wing design is very similar.
  23. Geoff_H
    Did you notice the Concorde? Aerodynamics designed by an Australian, Prof Tom Fink, an absolute genius.
  24. Geoff_H
    Posted email to him two weeks ago. No reply whatso ever. I have since been researching the internet dailey. Hence I am looking to this site.
  25. Geoff_H
    I have been trying to get building information on this aircraft. I have searched the website but there is no information such as build materials, build time, pictures during construction etc. To buy plans to find out information would cost 400Euro. Id anyone building one or have a set of plans or bill of materials?
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