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About Alan

  • Rank
    Well-known member
  • Birthday 23/11/1952


  • Aircraft
    Jabiru 230
  • Location
    Innisfail FNQ
  • Country
  1. I have some plotter rolls (contnuous graph paper roll about 300mm wide) in the lab drawers from some spectrometers we replaced in the 80s ( I hate throwing stuff out). They have a clear grid marking, but from memory the X axis is marked in wavelength units. They are possibly 50m long. I'll check details when I get back to work Tuesday. Or PM me an address and Ill send you a roll to try. Regards Alan
  2. Up until now I have always used Odyssey Batteries in my J230. However, I have just found my local battery shop is quoting a 2 months supply delay, so I went looking at alternative lead/acid batteries. Now the Odyssey battery is quoted as 200CCA, some of the batteries I have come across advertise 300CCA. Given the starter ring is at the back of the motor and the flywheel (prop) is at the front, should I be concerned for the starter ring attachment, crank shaft, etc as a result of the extra torque? Alan
  3. That may not be a silly question. But are window films polarised? and then again are there variation in the line resolution of the polarizing and does this matter?. But thank you a good point; It has promted me to think, I have several redundant LCDs, I'll strip the polarising layer off these and test various films
  4. My Dynon 10 A has been in service since 2006, so I can't really complain. However, the LCD screen has slowly deteriorated to a point requiring investigation. The polarizing layer on the LCD has started to fail via delamination. The instrument is still clearly readable, but this deterioration is no doubt on going. This is not a uncommon LCD failure mode, no doubt promoted by a hot hangar environment. Sending this back to Dynon USA for repair may take several months under current freight restrictions and I have not even enquired about the cost of this. It has been reinstalled to fill th
  5. Out of curiosity and because I had access to the tools when I first got my Jabiru I did some oil analysis work. ( I agree it is of very little value in comparison with the filter cut). In addition to routine spectro oil analysis, I used Ferrography (extraction and classification of wear particles up to about 150µm) to look at the oil during running in [i can probably dig out the photographs of the wear particles from the lab archives if any body is interested]. By heat treating (330°C for 90 sec) the particles once deposited on the glass slides, it is possible to differentiate the high grad
  6. Probably been dicussed before, if so sorry. Does laser/plasma cutting of alloy sheet leave any residual stress due to the heat gradient, especially with regard to pre-drilling for the rivet holes? Regards Alan
  7. My 296 screen faded out and I was unable to source a replacement screen or repair service. So I replaced it with a Aera 660. Visually it is brilliant, has all the whistles and knobs you could wish for as a package and it was easy to mod the 296 mount to take the 660. However, because I used Ozrunways a lot during the fade out, it has become my secondary device and sits most of the time just showing the synthetic 3D vision window. So far I have not found out how to upload plans from a PC to the 660, nor can I download recorded tracks like I used to with the 296. So still a lot to lea
  8. Interesting. I can find no mention of a mandatory L1 practical course on the RAA website. Regards Alan
  9. It looks like I am going to have to switch to using Mogas 95 in my Jab 230c as it is getting hard to conveniently access Avgas and I would rather operate on one or the other and not mix them. Any tips for using Mogas? Anything to watch for apart from using a busy servo to ensure fresh fuel, being aware of vapour lock risk etc. The Jabiru recommendation of not leaving Mogas in the tanks for longer than two weeks means more arduous use of the drain valves beyond checking for water. How do others that use Mogas drain out the unused fuel ie. is there a standard drain hose fitting for the
  10. Thanks for your help. I had assumed a mounting clip swap would be needed as will the BNC for the remote antenna. I was surprised that Jab fitted a remote GPS antenna; with composites I would have thought it unnecessary. Regards Alan
  11. The Garmin 296 GPS in my 10 year old Jab 230 has developed a white flare area in the middle of the LCD. The 296 is no longer available and replacement LCDs do not appear to be available either. I have an Ipad GPS etc. which I use with a kneepad, but would like to fill the gap in the panel. So I need a replacement GPS, preferably able to fit in the panel where the 296 used to reside. Perhaps somebody else has had this problem. Any suggestions/experience etc? Regards Alan
  12. In one of the early videos of the roof where the aircraft impacted, there are clear slice marks presumably cut by a rotating propeller. No doubt the experts can determine whether that engine was at operational rpm from that. Alan
  13. Rather than just mentioning the TC-3 temperature spread, I really should have qualified that. EGTS vary with operating condition, but are all well within limts. During climb No 4 CHT is always 20°C above the next nearest; if I climb at 80 Knots to 1000ft after take off it would go to above 180°C, climb at 90 Knots and No 4 CHT reaches 170°C. In the circuit or in the cruise CHT are varied but well within limits, but No 4 CHT still leads. The original Jabiru CHT guage (ring under No 6 Sparkplug) always stays well in the green. The CHT sensors are fitted in between the spark plugs
  14. I have one in my J230 and the instrument is excellent, the reading spread a little less so.
  15. I am not happy with tone and attitude of some contributors to this site. However, they have achieved what they set out to do and ultimately, I feel it will be to my safety advantage to be able to choose to modify out some of the fragilities of my Jab engine . Out of the six Jabiru powered aircraft operating here, and they are all actively used and I have never heard of any engine problems - but that is irrelevant as in the big picture it is too small a sample. I work in reliability and would not be happy using rumour, inuendo and some of very poorly qualified statistics that has been pe
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