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Cosmick

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Posts posted by Cosmick

    peeing while on long flight

    in AUS/NZ General Discussion

    Apparently midair at Gympie at 3pm today, 9/11/22

    in Aircraft Incidents and Accidents

    Posted

    Gympie is a common waypoint for aircraft traveling north from Brisbane, Caboolture, Redcliffe and Caloundra being west of Maroochydore airspace and has active local traffic.
    The accident apparently occurred 16km (9nm) from Gympie at altitude. If the Sabre was transiting the Pilot would possibly just have switched to ctaf from area. A glider at same altitude does not offer much of a profile and at possibly 100+ knots closing speed……… my 2 cents. 

    • Like 2
    • Informative 1

    Wanted Test Pilot

    in AUS/NZ General Discussion

    Posted

    On 3/11/2022 at 5:43 PM, Steve L said:

    Spot on Bruce, after that incident I wonder if he’s still test flying. Also sad for the owner of the Sonex who lives in the UK and built the plane here. 
     

    A similar incident happened to Maj ( may he Rest In Peace ) as he wasn’t so lucky.

     

    steve 

     

    Also Wayne Fischer of drifter fame. Dangerous jobs I wouldn’t do it.

    • Agree 1

    Skyranger Nynja cruise speed and WOT at 5,500 rpm.

    in Skyranger

    Posted · Edited by Cosmick

    I also find this confusing. I read the forum above and was comfortable in my belief of cruise rpm 912uls between 5100-5400. Then I got to the last couple of comments on in flight adj setups.

    Reading comments from gyro operators and they cruise around 4500 with 914's and 915's which they have for more power. Surely if you have ground adjustable you would reduce the pitch to cruise at say 5200 and have shorter take off and better climb.

    V speeds in planes.... (The big ones)

    in AUS/NZ General Discussion

    Posted

    On 27/10/2021 at 6:34 AM, flying dog said:

     

    V1 should be replaced by a P1 - Point1 which indicates:  YOU MUST BE FLYING BY NOW OR YOU WILL NOT STOP BY THE END OF THE RUNWAY!

    Also the fact that VR > V1 is also weird/strange/confusing.

    You have a "gap" between when you can take off and when you must take off.

    Surley VR should be LESS THAN V1, or more correctly:   P1

     

    I don't know what i'm talking about but looking from the outside in - VR and V2 are airspeed. V1 is Groundspeed Vs remaining runway. The longer the runway V1 moves further down the runway so VR could be less than V1.

    • Agree 1

    What is the best fuel (Mogas) for your engine

    in AUS/NZ General Discussion

    Posted

    On 05/11/2021 at 7:37 AM, Cosmick said:

    Rotaxservice.com -  The Rotax 912 A/F/UL engines require a minimum octane rating of 87 AKI, commonly referred to as “regular” while the Rotax 912 S/ULS/ULSFR and 914 F/UL require a minimum of 91 AKI (“premium”).

    Reviewing again the Video I listed earlier and referring to the Rotax requirements I notice the Octane measurement used is AKI which according to the 'Man in the Video' is 4 points less than RON so 87 AKI is 91 RON and 91 AKI is 95 RON.

    What is the best fuel (Mogas) for your engine

    in AUS/NZ General Discussion

    Posted

    So out there you have the Skippys and the Turbs, KGs Nevs and Wals (sorry to take liberties) and others who will investigate the intricacies of fuels and then there is the rest of us who ask advice and get good feedback and some individual biases. Personally I use 95 like an Insurance cover that I know nothing bad should come of that fuel and I store in airtight metal containers (good condition jerry). Reading the above feedback does give us (me) the uneducated some satisfaction of good practice.

     

    I think this guy is funny, sometimes too much and I tire of him but this Vid seems to cover technically.

    https://www.youtube.com/watch?v=3Sl5KqF4AM8

    What is the best fuel (Mogas) for your engine

    in AUS/NZ General Discussion

    Posted

    First lets start at Manufacturers recommendations - Rotaxservice.com -  The Rotax 912 A/F/UL engines require a minimum octane rating of 87 AKI, commonly referred to as “regular” while the Rotax 912 S/ULS/ULSFR and 914 F/UL require a minimum of 91 AKI (“premium”). Some may have noticed that the Rotax manuals mention ratings of 90 and 95 respectively.

    Jabiru - AVGAS or Unleaded Automotive Gasoline above 95 Octane RON https://jabiru.net.au/wp-content/uploads/2018/05/JSL007-7_Fuel_Guidance.pdf

     

    This article talks about the benefits for certain engines of increased octane fuels - https://www.mynrma.com.au/membership/my-nrma-app/fuel-resources/which-octane-petrol-is-best-for-you 

     

    I have only had aircraft with 2 and 4 stroke Rotax and was advised at schools and by peers to use 98 Octane even in 2 strokes with of course only Rotax recommended 2 stroke oil. When up there we all want an efficient clean fuel system and is this the only (but very good) reason for the higher than recommended octane usage, do any Aircraft engines have Valve Timing to utilise the denser fuel.  

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