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Tasmag

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Posts posted by Tasmag

  1. 2 hours ago, shajen said:

    Hey Glen,

    looking at the regulator wiring diagram from Jabiru, I’m a little confused. 
    Jamie at Jabiru said the yellow should go direct to the positive on the battery via a 1amp fuse. But the diagram shows the yellow goes to the main bus and red goes to battery positive. 
    Am I missing something?

    It just depends on which regulator you have, the old ones go the the main bus, the new ones go direct to battery.

     

    Mike

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  2. 13 hours ago, Blueadventures said:

    Long shot here; are your ignition ground wires shieled and the shield grounded at only one end?

    The easiest way to achieve this is to use a single core shielded wire, connect the shield to ground at the engine and the wire to the mag. Then switch these two to ground the mag.

    When engine is running the shield is grounded. 

  3. Thanks Glen

     

    The system is MGL and utilises CaBus for the control of the Servo.

     

    Unfortunately, there are a number of other CanBus terminations within the ground plane area as well, so the shielding lengths you mention are problematic.

     

    That was the main reason I was wondering if a metal shield would contain the lobing/Near Field of the signal and minimise the effect on the CanBus. (Probably not even remotely the correct terminology!)

     

    Would a solid ground plane be an option to minimise the effect of the Near Field RF.

     

    Mike

  4. i all

    I have a jabiru with 2 axis A/P that works a treat, until I broadcast on my second comm.

    The antenna for this comm utilises crossed copper tape on the floor of the fuselage which continues around the Pitch Servo. The servo is effectively inside the ground plane, but not electrically connected to it.

    When I transmit on this antenna for longer than a couple of seconds the pitch servo occasionally fails and requires a reboot of the A/P. (Seems to happen most when on 123.45)

    Would the addition of an aluminium sheet or aluminium flyscreen over the copper tape shield the servo from the RF that is causing the failure?

     

    And would that sheet need to be electrically isolated from the copper tape?

     

    Thanks in advance

    Mike

  5. Might be worth checking, I swapped the gauge out and was getting really good leak Down numbers, but when tested against another, and checked the orifice,  it was always going to give 80/78's😀

    • Like 1
    • Informative 1
  6. 16 hours ago, MartyG said:

    Thanks for all the info guys, Found this on a Aussie site but doesn't say what size the orifice is but I will call them. 

    https://premium-diagnostics.com.au/products/cylinder-leak-down-tester-compression-leak-detector-petrol-engines

    I purchased this exact kit, total POS. (Not from there, and not that price though)

     

    The orifice size looks like it was blown out with Oxy!

     

    Been meaning to fix it but haven't bothered yet. (Using a loaner instead)

     

    Mike

    • Informative 2
  7. 11 minutes ago, facthunter said:

    Slightly heavier starting solenoid. Leave it connected for a while before cranking and the lower charged battery will pick up some ergs and help the starting.  That's your extreme case. take a bit more time and charge it. you shouldn't commence a flight with a dead battery.  Nev

    Thanks Nev, looked at this option a while ago but wasn't happy with the ratings compared to the likely surge current when jump starting from a Lithium jump pack.

     

    Just a quick edit - I hadn't considered using a starter that is only energised at time of use (by the start pack), was looking at continuous duty, your suggestion will work fine. Ill be giving it a go.

     

    Mike

    • Like 1
  8. I am looking for 2 bottles of the fuel tank Kreem that Jabiru used for lining the wing tanks. 

     

    Unfortunately not able to be sourced in Australia anymore, was hoping someone has some laying around.

     

    Mike

    images.jpeg

    • Like 1
  9. Another option is to purchase an Iridium sat phone, new or used, and if you are on Telstra (postpaid) your current sim can be used for calls and texts. Won't need a plan for this, but do have the inconvenience of swapping the sim.

     

    Calls were about $3 a minute and texts 75c last I checked.

     

    You have to enable your plan for international calling as well.

    • Like 1
    • Informative 1
  10. What do the brains trust think of the attached pic.

     

    This is a Jabiru Gen4 - unleaned.

     

    It shows that the EGT on No6 starts at highest for full power, and then drops to lowest when pulled to cruise setting. At the same time No6 CHT, which is the blue line at bottom of page, that starts high and drops to the lowest.

     

    I am thinking that No 6 is running lean-ish at all times and then really leans away when power is reduced.

     

    The chart also shows later in the flight (yellow circle) where No6 does the opposite to the other cylinders at different power settings.

     

    Induction leak maybe?

     

    Mike

     

     

     

     

    1.jpg

  11. 16 minutes ago, walrus said:

    As far as I know, common law has no offence of ‘being on private property “. The offence of trespass only exists when you have been told to leave and don’t. That is why signs say “trespassers prosecuted” not “people on my land will be prosecuted”.  PPR is an instruction to ask for permission- you can’t be trespassing if you haven’t asked. You are only trespassing after you have been told to piss off and you refuse without excuse.

     

    As for landing, there is an obvious defence of necessity and if your motor is stuffed you can’t immediately leave can you? Furthermore, I’d be interested to see the text of any law repealing the law of gravity - banning the landing of an aircraft anywhere.

     

    Wilful damage, negligence, carriage of firearms, etc. are a different matter.

    Not quite correct, trespass is trespass, the power of arrest is only available if the person refuses to leave (Not the same in all states though). You can be charged with trespass by summons even if you leave when asked. ( pretty confident that is Australia wide)

  12. The horizont stab angle of incidence did change from the early 230/430 models, which may make some difference as well. Went from 3° down, to 1.5° down from memory.

     

    Might also be worth looking at the springs on the trim mech, I think the newer ones are a bit stiffer.

     

    Mike

     

     

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