Europa-List Digest Archive

Thu 06/30/16


Total Messages Posted: 6



Today's Message Index:
----------------------
 
     1. 05:47 AM - Re: Reposition oil cooler on Classic Trigear (jonathanmilbank)
     2. 06:41 AM - Re: Reposition oil cooler on Classic Trigear (jonathanmilbank)
     3. 07:49 AM - Re: New Smartphone App for pilots (rampil)
     4. 07:49 AM - Re: New Smartphone App for pilots (rampil)
     5. 07:49 AM - Re: Re: Reposition oil cooler on Classic Trigear (David Watts)
     6. 07:49 AM - Re: New Smartphone App for pilots (rampil)
 
 
 


Message 1


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    Time: 05:47:06 AM PST US
    Subject: Re: Reposition oil cooler on Classic Trigear
    From: "jonathanmilbank" <jdmilbank@yahoo.co.uk>
    Hi Gordon. I hope I'm not too late with this suggestion. It is "cheap and cheerful" as the saying goes and furthermore it works! The oil temperature came down by 20C, without moving anything or cutting holes. I have a Classic which was converted to a tri-gear and then later had the 80hp engine replaced with the ULS 100hp. Immediately I experienced the same cooling problems as you describe, but I didn't want to rush into moving the oil cooler nor to start cutting holes in the lower cowling, in case such experimenting didn't work. At first I made a little scoop which sat above the left radiator and ducted air coming through the gap between the top of the radiator and the opening in the cowling, intending to increase cold air flow down into the gap between the radiator and the oil cooler. This little arrangement was a failure, but got me thinking harder. The real problem turns out to be that after air has passed through the relatively widely spaced cooling fins in the radiator, it then struggles to pass through the tightly spaced cooling fins of the oil cooler. So it takes the easier route and spills around the sides of the oil cooler. The answer for me was to seal the 20ish mm gap between radiator and cooler, giving the air no choice but to pass through the cooler. Off to Halfords I went and bought a car exhaust repair bandage, which is a strip of aluminium tape about 50 or 60 mm wide and sticky on one side. I then folded it over lengthwise to make the tape narrower but still the same length, with the sticky side outwards. This narrower strip of tape was slightly wider than the gap and I easily used it to wrap all around the gap between radiator and cooler, sticking to the cooler and touching the fins of the radiator. Job done! I live and fly in Aberdeenshire where it's a miracle if we ever see an OAT above 20C, so I won't claim that my fix is the answer to your prayers. But I'd be surprised if my solution doesn't drop your oil temperature noticeably. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=457551#457551


    Message 2


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    Time: 06:41:42 AM PST US
    Subject: Re: Reposition oil cooler on Classic Trigear
    From: "jonathanmilbank" <jdmilbank@yahoo.co.uk>
    Quoting Dave Watts above "I mounted the cooler to the engine, centrally below the spinner arc". Dave, I'm curious to know for how many flying hours your oil cooler has been mounted to the engine and also whether you found it necessary to mount it to some kind of 'rubber' suspension blocks to minimise the risk of engine vibrations causing the oil cooler core to crack. If I ever have to move south into warmer weather, possibly following a Scottish referendum vote in favour of full independence, then my aluminium sticky tape solution described above might not give enough oil cooling. Perhaps I'd use your solution which makes removing the bottom cowling so much easier. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=457557#457557


    Message 3


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    Time: 07:49:15 AM PST US
    Subject: Re: New Smartphone App for pilots
    From: "rampil" <ira.rampil@gmail.com>
    Hi Marcel! Thank you for your kind comments! The new version of the app is in the Apple system pending review and it has a revised preferences selection which allows qnh in millibars and displays output in feet if desired. I also caught and squashed a rare bug in the input picker logic. The question of high altitude accuracy is a bit complex. The actual sensor is the Bosch Sensortec BMP280 Barometric Sensor which is rated as accurate to FL200. The raw pressure reading then must be converted to altitude using an exponential equation which takes into account lapse rate and compressibility, etc. Lapse rate does change a bit from ideal with daily weather. The equation I use is held to be generally accurate up to about 11 km MSL. I personally have taken the app to as high as 8000 MSL and it is usually about 50-75 feet of panel altimeter. I also appreciate the warning about errant pilots and rapacious lawyers. -------- Ira N224XS Read this topic online here: http://forums.matronics.com/viewtopic.php?p=457558#457558


    Message 4


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    Time: 07:49:16 AM PST US
    Subject: Re: New Smartphone App for pilots
    From: "rampil" <ira.rampil@gmail.com>
    Hi Marcel! Thank you for your kind comments! The new version of the app is in the Apple system pending review and it has a revised preferences selection which allows qnh in millibars and displays output in feet if desired. I also caught and squashed a rare bug in the input picker logic. The question of high altitude accuracy is a bit complex. The actual sensor is the Bosch Sensortec BMP280 Barometric Sensor which is rated as accurate to FL200. The raw pressure reading then must be converted to altitude using an exponential equation which takes into account lapse rate and compressibility, etc. Lapse rate does change a bit from ideal with daily weather. The equation I use is held to be generally accurate up to about 11 km MSL. I personally have taken the app to as high as 8000 MSL and it is usually about 50-75 feet of panel altimeter. I also appreciate the warning about errant pilots and rapacious lawyers. -------- Ira N224XS Read this topic online here: http://forums.matronics.com/viewtopic.php?p=457559#457559


    Message 5


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    Time: 07:49:16 AM PST US
    Subject: Re: Reposition oil cooler on Classic Trigear
    From: David Watts <dg.watts@talktalk.net>
    Jonathan, I had done 450 hours with the original installation with the oil cooler behind the water radiator. I have now done 1780 hours with the new installation, the last 1330 hours with the 912S fitted. I used small Lord rubber mounts to isolate the cooler from the engine. Dave Watts G-BXDY Classic Monowheel 2232 hours > On 30 Jun 2016, at 14:32, jonathanmilbank <jdmilbank@yahoo.co.uk> wrote: > > > Quoting Dave Watts above "I mounted the cooler to the engine, centrally below the spinner arc". > > Dave, I'm curious to know for how many flying hours your oil cooler has been mounted to the engine and also whether you found it necessary to mount it to some kind of 'rubber' suspension blocks to minimise the risk of engine vibrations causing the oil cooler core to crack. > > If I ever have to move south into warmer weather, possibly following a Scottish referendum vote in favour of full independence, then my aluminium sticky tape solution described above might not give enough oil cooling. > > Perhaps I'd use your solution which makes removing the bottom cowling so much easier. > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=457557#457557 > > > > > > > > > >


    Message 6


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    Time: 07:49:27 AM PST US
    Subject: Re: New Smartphone App for pilots
    From: "rampil" <ira.rampil@gmail.com>
    Hi Marcel! Thank you for your kind comments! The new version of the app is in the Apple system pending review and it has a revised preferences selection which allows qnh in millibars and displays output in feet if desired. I also caught and squashed a rare bug in the input picker logic. The question of high altitude accuracy is a bit complex. The actual sensor is the Bosch Sensortec BMP280 Barometric Sensor which is rated as accurate to FL200. The raw pressure reading then must be converted to altitude using an exponential equation which takes into account lapse rate and compressibility, etc. Lapse rate does change a bit from ideal with daily weather. The equation I use is held to be generally accurate up to about 11 km MSL. I personally have taken the app to as high as 8000 MSL and it is usually about 50-75 feet of panel altimeter. I also appreciate the warning about errant pilots and rapacious lawyers. -------- Ira N224XS Read this topic online here: http://forums.matronics.com/viewtopic.php?p=457560#457560




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