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Showing content with the highest reputation since 19/06/19 in all areas

  1. 2 points
    Here is a copy of article. Dear Forumites Herewith an incident I had with diesel in petrol. I'm sharing this to create awareness, so here goes: On Saturday I decided, on short notice, to fly to a meeting Outjo to Otjiwarongo (1/2hr), and from there to Tsumeb (2hrs). From the word go I was late for the meeting and had less than an hour to get my Hawk ready. I needed petrol and found my normal fuel container 3/4 full. Which was weird, because I always empty them (What doesn't fit in before a flight gets added after), but what was inside looked and smelled like unleaded, so I just added petrol at the pumps to fill them completely and off I went. During warming up I noticed a little bit of blue smoke coming from the exhaust when looking at it against the sun. By the time I got the hangar doors closed I had already forgotten all about it. En route to Otjiwarongo I found that I burned 11.8l/h instead of the normal 11.0 @ 4,900rpm, but put it down to weird and ignored it further. The EGT's looked slightly lower than normal, but the weather was cooler so that explanation was tagged to the problem. In Otjiwarongo all was normal. I even took a friend for a short scenic flight before I departed to Tsumeb. During the pre-flight in Otjiwarongo I didn't check the oil level. How much oil can one lose in 40 minutes, right? En route I noticed that the 912 UL seemed to run slightly erratic, the revs dipped from 5,000 to 4,800 every now and then. When I applied full throttle the engine responded fast and willingly and settled back on 5,000 easily. This puzzled me, but it was turbulent and I was busy dodging rain showers, so I found another convenient explanation: Obviously the turbulence I ran into caused the motor to labour every now and then. Problem analysed and explained away. On landing in Tsumeb I found my oil container brim-full and every drop of oil that couldn't fit into the tank (which was a lot) spread evenly over the tail feathers. After a whole day of trying to find an explanation (it isn't easy at all to explain 1.5l of oil gained during the flight) I latched onto a possible solution and traced the fuel supply. The "petrol" came from a diesel car that was wrongly filled with petrol at the pumps. The mixture was drained and stored for further use. I had actually witnessed the whole operation and was also concerned that "my aircraft fuel containers" were used for the job, but I'd mos know about it and not forget. Right. The 912 is fine. Except for a red face, so is the pilot. The spark plugs were cleaner than I have ever seen them, it looked like a layer of coke had been loosened from the pistons. We drained and refilled both oil and fuel and changed all filters. The magnetic oil plug was clean except for a single sliver of metal. I'll have the oil analysed to check, but the Hawk behaved very well during the flight back to Outjo, which was conducted at ample altitude for a possible emergency landing. I fly a low compression 4-stroke. With a higher compression engine like the 912 ULS the story may have ended differently, or finally. Thus to repeat my instructor's lessons: • Don't be rushed when tending to your aircraft. • Make sure about your fuel supply. Repeat, make *sure* about your fuel supply. • Don't take deviances from normal lightly. My fuel consumption wasn't normal, neither were the lower EGT's and definitely not the fluctuating revs.
  2. 2 points
    Don’t let the cheaper price of any safety item dictate your purchase decision. You hope you never need it but, if the day ever comes you want it to be reliable and work the best it can. Cheers, Jack.
  3. 2 points
    The "radiator" cap on the Rotax is designed to hold pressure to a certain point and then release coolant into the "over flow" tank/bottle. The cap is also designed to allow coolant to flow back, as the system cools down (in cruise/decent & engine off) the coolant is then drawn back into the cooling system. That's why you only fill your overflow between 1/4 & 1/2 to allow room for the hot coolant to be temporarily stored (if your overflow fills to the top excess fluid will be dumped. If you have doubts about the condition of your radiator cap - purchase a new one (much cheaper from your Ducati Motorcycle dealership)
  4. 1 point
    Miss Piggy is now gone :(
  5. 1 point
    Nice idea to put the radio in the car Jack,. .. but FFS, don't go changing channels while you're driving,. . as we don't need a 'Young Pilot trainee hits Back of truck while changing radio frequencies' report.. . . .! ! ! ! ! In the UK, that would be charged as using a Mobile Phone And you'd get a £200 fine and Six demerit points on your license IF you survived hitting the truck. . .( ! ) BW, I use a 5/8ths wave base loaded whip antenna for airband monitoring, as it gives a much greater range for airband VHF comms. Mag bse lso,. . .I only use UHF to listen to the Yanks, ad their radio procedure is Pants, . . ie, heard near Lakenheath USAF base in UK. . . "Err,. . BUGEYE NINER TWO,. .. THIS IS BUGEYE FOUR THREE . .I GOT YOUR SIX BUDDY". . . .hmmmm Most professional. . . .
  6. 1 point
    And its done, it took 2 months of active work on it. Lets hope cooling works.
  7. 1 point
    They’re arising from the transition from “AFFIRMATIVE” to what appears to be the ICAO standard “AFFIRM” which now applies. In Australia there is a near hopeless standard of public service mentality in the people who make these changes and fail dismally to advise them openly, and regularly update the training, and ensure that Instructors, who always seem to be very quiet on occasions like this also get the message through. Our safety levels have dropped as a result of authorities hiding behind the “see and be seen” policy, we know who is responsible and we know who to come after when accidents inevitably occur.
  8. 1 point
    They arent certified and the basis that hot air degrades performance would depend on mixture wouldnt it? Generally they run rich 6 cyl has almost nil rpm drop at idle, maybe 100 rpm on cruise and the system melts ice very well, 5 sec or less
  9. 1 point
    I had a good one and sold it to a friend for his daughter's use and she totalled it in a few days. Easy car to work on (RWD 5 speed man.) Copper said she would have been killed in anything else. Finally admitted she was going a "BIT quick". Nev
  10. 1 point
    I thought that also so when testing was complete I drained the tanks fully. Then I left the system open so most of what was left would evaporate. When it comes time to actually run fuel through the system I will waist a gallon or so by putting it in the tanks letting it run to the header tank and then draining the header tank until I see no contamination. As far as fuel testing I will do complete system leak testing with fuel before I mount the wings.
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