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Thread: Fascinating insight into a problem rarely encountered here.

  1. #11
    JDNSW's Avatar
    JDNSW is offline RoverLord Silver Subscriber
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    Not density related, but one of my more interesting flights in PNG was as a passenger (in the RH seat) of a C402 into a small strip at Nuku in the West Sepik. Approach to the strip is over a ridge on the opposite side of the valley, below treetop height, through a gap in the middle of a village, with moderate power and full flap, then immediately clear of the ridge, maximum angle of sideslip to lose altitude down to the threshold, straighten up for touchdown, then full throttle - to keep it moving up to the top of the strip (let it stop and you will need the station tractor to get to the top). At the top of the strip, turn across the slope so you are not relying on brakes to avoid finding the plane at the bottom of the valley in an unairworthy condition. And turn off fuel tank crossfeed.

    Takeoff (in the C402 is with very limited payload) is in the opposite direction, and turn down the valley once airborne.

    Much less drama in a BN2a that has an approach speed of about 45kts compared to the C402 of about 100kts. And can depart at MTOW.
    John

    JDNSW
    1986 110 County 3.9 diesel
    1970 2a 109 2.25 petrol

  2. #12
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    Not so much these days but used to be common to operate from strips up to 4500' in tableland country, warm days of 30+ puts the density height up. Flying fires in the summer around Vic high country thin air as well, a drop near mount Bogong had to approach near the top (Top around 6,500?) and descend a couple of thousand feet down one side to get access to the fire. Was a bit strange seeing snow drifts around the summit just before Christmas.

  3. #13
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    Hi,
    Altitude can affect engine cooling too.
    A mine at high altitude in USA had cooling problems with trucks as the lack of air molecules passing the cooling fins reduced the heat removal.
    Being underground and warm did not help either.
    Cheers

  4. #14
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    Quote Originally Posted by Fourgearsticks View Post
    Was a bit strange seeing snow drifts around the summit just before Christmas.
    If you'd flown over Mt Dandenong, Olinda and Sassafras on Christmas Day 2006 you would have seen heaps. Not like Hotham, of course, but a lot for here where we don't often see snow in winter. Thankfully.
    ​JayTee

    Nullus Anxietus

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