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onetrack last won the day on December 12

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About onetrack

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  1. onetrack

    RAAus to disclose member details

    The tax monies garnered from aviation fuel taxes, do not go to airport owners or operators. Virtually all fuel taxes collected on aviation go to ASA and CASA. The report below, despite being over 20 yrs old, shows the fuel taxing regime within Australia. Not much has changed in 20 yrs, only the amount (in cents) collected. In particular, Figure 1 is a clear outline of revenues and returns to the varied parties. TAXES AND CHARGES IN AUSTRALIAN TRANSPORT: A TRANSMODAL OVERVIEW
  2. This is a particularly sad event. But it must make the instructor who taught her, wonder what went wrong in his training of her, and whether he should have concentrated more on her weaknesses in navigation, or concentration, or general flying skills. To run into cumulogranitus just 100M below the peak of the mountain range is the most basic and most unforgiveable flying error you can get. I was under the impression that you are always taught to ensure that there's lots of air between you and the highest known points of terra firma along your route. In every case I have read about, where a CFIT into high ground occurred, there were serious deficiencies in the PIC's navigation and flying skills that were never addressed - or their training was deficient. I understand the flying conditions were more than likely pretty atrocious, and mountain rotor turbulence could have played a substantial part in the reason or reasons for this crash. However, one would expect, it would have been hammered into her, to be particularly alert to the phenomenon - even more so, in the area she was flying into, which is well known for some of the worst types of these events. The sobering part is, if she had had a full complement of pax, we could have been looking at possibly Australias worst air disaster since Lockhart River. I trust the investigators find something of value in the wreckage, to determine the reasons behind this tragedy - but by the sound of it, they are going to be struggling to find any mechanical evidence of any value. ATSB - Mountain Wave turbulence
  3. I was under the incorrect impression (from an aging memory) that the reason for this crash was a washer was left out from a tail rotor mechanism fastener, leading to movement that fractured the fastener - leading to tail rotor breakup. I also recall the investigators went through the rubbish bins in the workshop and found the missing washer, thus proving their suspicions correct. However, the report simply says in this crash, the tail rotor fastener fractured completely, due to early-onset metal fatigue - and checking of several other similar machines also showed fractures starting under the fastener heads of two more fasteners. As a result of the investigation, the manufacturer reduced the programmed lifespan of that particular fastener, from 2500 hrs to 300 hrs. So I'm confused now (easily done today). Does anyone remember which helicopter crash it was, then, that was caused by the missing washer under the tail rotor mechanism fastener? It was a major crash, with serious loss of life.
  4. onetrack

    Antoinette V16

    Yes there is! - A very powerful aircraft, of course! What else? 😆 Antoinette V16 aircraft
  5. The machine leaves more questions unanswered than it answers. Q 1. How are the authorities going to treat this machine? It's an aircraft, so where are the rules and regulations for the operation of this thing? Q 2. At a maximum height of 16 feet, it's not going to clear a lot of powerlines and other aerial wiring in populated areas. In fact, it will be in direct conflict with them. So it would have to be operated at around head height or even less. That makes it exceptionally dangerous for people on the ground. Q 3. I can see some potential for the rig to be used in emergency work in marshy ground, exploration in remote areas, and in farming operations, in open paddocks/fields. But if the countryside needing to be accessed has trees more than 16 feet high, what then? Duck between the trees, and duck the passing swishing branches? I think the applications for the machine are going to be extremely limited, and the controls of its operation, very tight. Meantimes, back at the Ranch - how are the Dubai Police getting on, with their hoverbikes?? New Atlas - Dubai Police hoverbikes Can you imagine what a bank-robbing crim could do with a high-powered weapon - or even a shotgun, to one of these things?? Talk about a suicide mission. I guess the next American version will have it sorted - a .50 cal Browning MG mounted in front of the operator, will be their answer. 😓
  6. onetrack

    Bertin X-8

    I find the fact that a large number of these early flyers, tinkerers, and aircraft engine and airframe builders, seem to originate from the bicycle and motorcycle fraternity. Bertin was a bicycle mechanic, then a motorcycle mechanic. I guess dealing with light weights and small engines, as in motorbikes, would translate pretty easily across to flying machines. I think it also helped to be a bit of a mad bugger, a real risk-taker, as so many of the motorcycling and motorcycle racing fraternity seem to be, both then and now.
  7. onetrack

    Bertin X-8

    Here's an obviously rare photo of Leonce Bertin from 1910, posing alongside what appears to be one of his earlier engines, a single cylinder version. The hypnotic stare of Bertin into the camera lens appears to me, to indicate a man of great intensity and drive. Leonce Bertin - 1910
  8. onetrack

    Bertin X-8

    I ran out of editing time on the previous post, and I wanted to outline that the 1908 Bertin helicopter utilised fixed biplane wings, with a propeller for lift - but the improved 1912 version utilised a rotary wing for lift - as well as a propellor for lift. One can quickly see that although Bertins ideas for lift were going in the right design direction, he was obviously not aware of the need for added controls to resist rotor thrust torque, nor does he seem to have designed in much by way of rotor control, to control direction and speed of travel.
  9. onetrack

    Bertin X-8

    Leonce Bertin was quite an inventive fellow. He also designed a helicopter first in 1908, and again in 1912. The 1912 model appears to be powered with a 4 cyl version of his neat little engine. What is more - the rotor was designed in the shape of an aerofoil, rather than a propeller shape, as in current (rotary wing) design. This shows Bertin was aware that more than a simple propeller was needed for lift. The 1908 model utilised biplane aerofoils, but the 1912 version utilised a monoplane wing. There is a photo on the 'net (not readily accessible) of Leonce and his son Rene in the Bertin monoplane, apparently taken on the day they crashed (14th July 1913), which resulted in the death of both father and son. Bertin helicopter - 1908 Alamy stock photos - the 1912 Bertin Helicopter
  10. onetrack

    SSB Lithium Iron batteries

    Bruce, for aviation use, the lithium batteries do provide an enormous advantage with regard to weight. However, I wouldn't write L-A batteries off just yet, the L-A manufacturers are fighting back with a consortium dedicated to making serious improvements in L-A design and output, to try and counter the lithium attack. Gridtential gets $6M from Battery Strategics to advance Lead Acid batteries The global manufacturing level of L-A batteries is still 10 times that of Lithium manufacturers. Even Tesla's gigantic lithium battery manufacturing factory is not going to make a major dent in L-A production, globally. However, I believe L-A will continually lose ground to those applications where the weight penalty is a significant factor in the sale. Supercapacitors and ultracapacitors designed into electrical systems, along with batteries, hold great potential for vastly improved performance, particularly where there are demand spikes in power requirements. The latest ultracapacitor developments are quite exciting, and could alter the electrical landscape substantially, with particular regards to energy storage and useage smoothing. Very recent research developments are tantalisingly close to the possibility of making ultracapacitors replace batteries completely - even Lithium batteries. Alternative to traditional batteries closer to reality There are batteries available now, such as the Ecoult Ultrabattery, which uses the CSIRO-developed, combination supercapacitor and L-A battery, to produce vastly improved battery performance, faster recharging, and quick response to power demands. In particular, the Ultrabattery performs exceptionally well when operated at PSoC, which normally kills L-A batteries rapidly. The Ultrabattery promises a 10 yr life from their L-A technology. Ultrabattery technology
  11. onetrack

    SSB Lithium Iron batteries

    Markdun, you're right. All technology has its drawbacks, I've had L-A batteries explode on me, and seen some spectacular hydrogen explosions from batteries gassing without adequate ventilation. The big weight factor of L-A batteries causing cracking is a good point, one I had not considered. Acid corrosion is not the problem is used to be with better L-A battery design and better sealing. The simple fact is, you need to familiarise yourself with every downside of the technology of the product you're using, imagine every possible scenario where that downside could rear its ugly head, and plan and design accordingly. The figures to date show that the LiFePo4 battery has provided low enough numbers of "mishaps" in ground-based equipment, to the extent that those numbers are quite acceptable, as regards the risk profile. However, I have not seen any "mishap" figures related to aviation use of LiFePo4 yet, perhaps the numbers in aviation use are too low yet, to start providing quality stats.
  12. onetrack

    Small turbines 100hp 130hp

    The Szorenyi rotary engine is the latest development in rotary design. However, it appears to be likely to suffer from the same problem as all rotaries - trying to ensure a durable and reliable seal between rotor and stator. This niggling problem is likely to be worsened if the Szorenyi rotary engine reaches much higher revolutions than the Wankel. New 4 chamber rotary engine
  13. I don't think the Wright Bros would have got off the ground if it were not for the generously unpatented work of a lot of other aerial experimenters - including in particular, the austere bearded gent who graces our $20 note. But the device that really ensured the Wrights got airborne, was the wizard of a little lightweight engine, produced by the equally brilliant Charlie Taylor. Charlie not only built the Flyer engine from scratch, to the Wright Bros sketches and specifications - he also built the wind tunnel that Orville and Wilbur used extensively to prove up their theories. Perhaps if Lawrence Hargrave had succeeded in producing a workable lightweight engine, he would be the recognised pioneer of aviation, rather than the Wright Bros. Charlie Taylor - The man aviation almost forgot Biography - Lawrence Hargrave
  14. onetrack

    SSB Lithium Iron batteries

    Bruce - Despite the story being repeated, and referred to, continually - it's not true. Definitely an urban legend of the 1st order. In the same league as the Choking Doberman. Snopes - Cruise control crash urban legend The stories of RC aircraft powered by LiPo's, regularly crashing and burning, are, unfortunately, true. They are the real, "bomb waiting to go off", in the Lithium battery stable. You can get LiPo-Guard protective safety bags, that are designed to prevent your house from burning down, if they catch fire when charging - which they are known to do.
  15. onetrack

    SSB Lithium Iron batteries

    There's probably one main reason why Jabiru are reluctant to endorse Lithium batteries - even LiFePo4 batteries. And that reason is - despite LiFePo4 batteries being advertised and regarded as "benign" and "completely safe", they will still go into thermal runaway at temperatures around 270°C. They do have a lower heat release signature during thermal runaway, than the other lithium batteries. However - this simple fact means that if you install a LiFePo4 battery and are unfortunate enough to crash, and have a fire start in the wreckage, then the LiFePo4 will actively feed that fire, once the battery reaches the above temperature. One could say, "Well, if you're on fire after a crash, you or your aircraft are finished anyway". However, there are many survivors of aircraft crashes which ended in a post-crash fire, and if one can reduce the on-board items which will feed that fire, then that must improve the chances for the survivor/s of the initial crash impact.