Today's Message Index:
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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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Subject: | Re: Reposition oil cooler on Classic Trigear |
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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Subject: | Re: Reposition oil cooler on Classic Trigear |
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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Subject: | Re: New Smartphone App for pilots |
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
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Subject: | Re: New Smartphone App for pilots |
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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Subject: | Re: Reposition oil cooler on Classic Trigear |
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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Subject: | Re: New Smartphone App for pilots |
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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