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IBob

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Everything posted by IBob

  1. IBob
    Gosh.
  2. IBob
    Good to hear about Reg: I think I was the last NZ kit bought through him before we got our own agent. Reg was great to deal with, and certainly on those occasions when I needed his expertise. FWIW I bought August 2015, at which point the basic S kit in Australia was A$35K incl tax..........
  3. IBob
    Hi Skippy, as noted by several above, and also in the 912 manuals, the standard Rotax VDO and 4-20ma sensors are not interchangeable, due to different thread sizes. As for who might supply an alternative 4-20mA sensor, the answer is any one of many manufacturers of pressure transducers. And 0-10bar is one of the standard sizes. However there is a very big 'but': quality and associated price vary greatly. The Rotax transducer operates in a fairly hostile environment, with heat, engine vibration, perhaps also pulsing from the oil pump. And in my experience (I have fitted hundreds in industrial refrigeration settings) the only way to find if a given brand will prove durable in that sort of application is to try it. If my 912 had a VDO unit, I would be inclined to live with it, while also keeping an eye on it. If it had the later 4-20mA unit, I would expect it to be trouble free, as Rotax seem to have gone to some trouble to arrive at a durable solution.
  4. IBob
    Yes. For oil pressure Rotax shifted from the VDO type, which is a voltage output, to one which gives a 4-20mA current output. (4-20 also being a very common industrial standard for various types of sensor). So the instrumentation has to match which type you have. The VDO type units do seem to fail fairly regularly. The 4-20mA units are proving more reliable.
  5. IBob
    That's fine for setting, KG. My point was it's hard to check the gap with a regular steel gauge, as it sticks to the magnet and feels like a snug fit regardless.
  6. IBob
    Have you checked the ignition coil gaps? I have seen that make a big difference on a Rotax that had poor starting. Needs to be checked with a non-ferrous gauge, either that or no-go for next gauge size up, as regular feeler gauges stick to the magnet, feels like snug fit even if it's not.
  7. IBob

    Ch601 hds flaps

    IBob replied to a topic in Zenith

    Maybe ask JG at Stolspeed if anyone has put VGs on a 601HDS?
  8. IBob
    Absolutely. I'm one of those. And while I'm glad I did the build...one of life's special experiences...my energies went into that instead of flying. Go flying, Baz!
  9. IBob
    But you're only working two of those at any time?
  10. IBob
    Blueadventures, the standard keyswitch setup in the Savannah does two things: 1. Turned to On, it provides power to the various instrumentation.* 2. Turned further, it also operates the starter solenoid, with the usual spring return to position 1. *I opted to fit a separate switch for power to radio and transponder, allowing me to switch them on after engine start, and off before shutdown.
  11. IBob
    Not for too long, we hope..........)
  12. IBob
    The Savannah has separate 'mags' switches: not part of the keyswitch.
  13. IBob
    Interested to know........why?
  14. IBob
    As I recall, the RAT is not armed to deploy until the aircraft is in flight mode...that is, when the weight comes off the undercarriage. It looks as though that is when the RAT deployed: as soon as the wheels left the ground. Which would indicate that the condition/s to cause the RAT to deploy were present at time of rotation.
  15. IBob
    It's a slab-sided aircraft, I find I like layouts that reduce that slab-sided appearance. Most schemes don't do that, and some even emphasise it. For me, ZK-JUG works well:
  16. IBob
    Hi Marty, I started off colouring in side and top elevations, as you have. But I have seen aircraft where it looked okay on paper, but really didn't work on the aircraft. I think part of the problem is that we almost never get to view the aircraft directly side on, or directly from above. What we get instead is all sorts of 3/4 views, (typically from just below wing height in the case of the 701 or Savannah). What I did in the end was search my aircraft type on line and study all the pics for colour layouts that I found I liked. Once I had arrived at a layout (in my case a very simple one), I then sorted out the colour. I'm not good at visualising these things: I found this a much better way to come at it.
  17. IBob
    On that same subject: we are taught that the way to do a good visual scan is in successive short overlapping visual sectors, rather than in a continuous sweep. There is endless flying footage on YouTube etc. I don't know that I have ever seen a pilot there scanning in sectors, and more often than not they don't even appear to be doing any sort of sweep....
  18. IBob
    Yes. Following a double fatal midair here, we got a detailed look (during preparation for the proposed court case) at the limitations of 'see and avoid': Notably the closing speeds vs the considerable amount of time typically required to first spot the aircraft, then register the danger, then react to it, then for evasive action to actually take effect. Also a study carried out years ago in the US: the pilots were told it was to provide data on how they managed their various inflight workloads, but they were also instructed, in passing, to call out any other traffic they may see. Flights were then arranged, unbeknown to the pilots, with a number of traffic intercepts.....not collision stuff, but quite close enough to see. On average they missed seeing 40% of that traffic.
  19. IBob
    FWIW flocking is now a thing in the skydive world: opening extremely high then flying around in a big mob formation.......
  20. IBob
    That is a 912 UL, with a lower compression ratio. I never tried, but I'm doubtful I could pull a 912 ULS over that briskly. Still, I stand corrected!
  21. IBob
    Okay, that's a revelation!
  22. IBob
    As pointed out by others above: 1. Burping the Rotax relies on blowby to pressurise the crankcase and push the oil back. That being the case, you are no better off pulling it over briskly: you are actually better to linger in the compressed state, so maximising blowby. 2. You can't hand start a Rotax. The reason for this is that the power for the ignition comes only from little dedicated stator coils and the engine has to be turning over very briskly for these to generate sufficient power. Having said that, one still reflexively checks 'mags off' before pulling it over....
  23. IBob
    Marty, I recently searched the thermal conductivity of wood. In the same paragraph, AI stated that thermal conductivity is higher in denser woods (makes sense), it then stated that denser woods are preferred in building due to thermal insulation properties. It then changed it's mind yet again in the next paragraph. What this illustrates is that, while the thing is writing English (so appears logical), it is not actually in any way checking for logical consistency in what it writes.....(
  24. IBob
    Hi Marty, my kit came from Oz, and the then dealer supplied bellows type 'rubbers' to go on steering rods and throttle rods. I don't have the details of those, but he also supplied a pattern for making a protruding collar round the rod slots, attached to the firewall, which the big end of the bellows then fitted neatly over. It looks an odd shape, but when you rivet it's ends together to make an oval, it is angled so that it attaches to the firewall in line with the rods (not perpendicular to the firewall as a single width band would). See Boot Bracket, below. Boot Bracket.pdf
  25. IBob
    And wasn't he (the copilot) there to try and keep an eye on Hollands and his behaviours?
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