Today's Message Index:
----------------------
1. 02:03 AM - Re: 912UL operating temperature (Frans Veldman)
2. 02:17 AM - Re: Re: iPad battery charger (Frans Veldman)
3. 06:27 AM - Re: 912UL operating temperature (Carl Pattinson)
4. 09:15 AM - Europa fly-in - Popham (Guerner Remi)
5. 10:18 AM - Re: Europa fly-in - Popham (Pete Lawless)
6. 10:58 AM - Re: Europa fly-in - Popham (Richard Wheelwright)
7. 11:11 AM - Re: iPad battery charger (rampil)
8. 11:31 AM - Re: Europa fly-in - Popham (Michael Orth)
9. 02:32 PM - Re: Europa fly-in - Popham (Terry Seaver (terrys))
10. 11:28 PM - Re: iPad battery charger (Remi Guerner)
Message 1
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| Subject: | Re: 912UL operating temperature |
On 06/16/2013 02:40 PM, Richard Lamprey wrote:
> <lamprey.richard@gmail.com>
>
> Greetings to all from Kenya.
>
> Does anyone know what is the minimum cylinder head (coolant)
> temperature for normal operations? The manual gives maximum but no
> minimum, save for warming up to above 50C for takeoff power. I was
> told recently that cylinder head temp should not be too much below
> Oil temp, but not sure about this.
My idea is that all the different materials and shapes in the engine
expand at a different rate when the temperature varies. For optimum
engine live and performance it is best to have the engine wearing its
moving parts against each other at one fixed temperature. If the
temperature varies, the wearing pattern also varies, and you will end up
with an engine wich is "loose" on all temperatures (i.e. loosing its
compression).
Also engine performance rises with rising temperature. Cooling the
engine means robbing its precious combustion energy, so keeping the
engine near its higher end of the temperature scale pays off. (Think
about that one: the reason we burn fuel is to rise the temperature of
the contents of the cylinder so that it expands and produces a force.
The more you take away the heat, the more you take away the driving
force. It is unfortunate that we have to cool at all, one reason why
engineers try to minimize cooling losses when designing efficient
engines. So keep the engine temperatures up, it is one of my secrets of
getting more speed for a liter of fuel).
The only way to achieve this properly is by controlling the amount of
cooling you apply. You can use thermostats or better yet, a movable cowl
flap.
I always maintain a coolant temp of 110C and an oil temp of 115C. This
also has the side advantage that I never reroute too much air for
cooling and this lowers the drag considerably. Some clever souls claim
that for the modern efficient airplanes 40% of the total drag consists
of cooling drag, so it pays off to tinker with the cooling system. (Of
course a thermostat instead of a cowl flap doesn't have this advantage).
Frans
Message 2
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| Subject: | Re: iPad battery charger |
On 06/16/2013 09:52 PM, Remi Guerner wrote:
>
> Frans,
> I have made some more investigations before reading your message. Here are the
results:
> 1. Charging my iPad with my charger in another aircraft (Dyn Aero MCR 01): no
noise.
> 2. Charging my iPad with a friend's charger in my aircraft: same noise as with
my own charger.
> So it seems that the problem comes from the configuration of my panel and wiring:
my cigar lighter is located very close to the Com radio while in the MCR
is located very far on the passenger side.
You see what some testing can reveal! Now it looks like it has something
to do with the wiring in your specific panel. Maybe the wiring has a
specific length which "resonates" at comm frequency and thus acts like
an antenna, or causing the oscillator in the charger to move its
frequency slightly so it ends up in the comm frequency band.
I'm now confident that you can solve the problem. Have you tried to
solder a capacitor over the two wires of the cigar lighter plug?
Or wrap the cigar lighter plug wires around a ferrite core (or better
yet, through a torroid?)
You may have noticed that today many cords of chargers and power
supplies have a thick cylinder inside the cord, most often close to the
device it is supposed to charge. Inside this cylinder there is such a
torroid and it is there just to avoid the problems you describe. So,
obtain such a cord from an old laptop power supply, trim it to length
(leaving the cylinder where it is) and use this cord to feed your cigar
lighter. I it also a good idea to use such a cord to feed your radio
(just make sure the wire diameter is up to spec).
Let's first try these simple solutions. I suspect that it will solve
your problem. Otherwise I know a few more but I don't think it will be
necessary.
Frans
Message 3
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| Subject: | 912UL operating temperature |
Hi,
We have been going through similar angst with our engine temperatures -
following a carburettor rebuild.
Ours was running hot due to us rebuilding/ servicing the carbs - we used the
proper Bing overhaul kit 145 per carb - ouch. We assumed that the float
levels would be set at the factory but this is not the case - there is a
tool for adjusting the float levels which can be hired (however there is a
much easier/ cheaper way - I can explain if you email me).
Anyway, during my attempts to get to the root of the problem I found a
really good chart listing all the engine temps/ pressures on a single page.
http://www.rotaxservice.com/documents/4STref.pdf
These guys are the Rotax service agents in Canada - they have loads of
really useful helps , tips and troubleshooting charts on their site
including all the carb data - jet sizes, settings etc.
Our cylinder head temps have always been fairly low - about 80% with oil
temps between 100 - 125 C. Max CHT I have seen was about 100 but that was on
the ground with reduced cooling.
I find EGT is a better indication of the mixture - before our problem was
fixed (getting the float levels correct) our EGT's were running at 870
(misfiring badly). Now correctly adjusted we are down to 780 and 800
(measured on the front cylinders - these are the coolest). My guess is the
rear cylinders would be 30-50 degrees hotter.
Good luck
Carl Pattinson
G-LABS
912 UL - 80hp
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Richard Lamprey
Sent: 16 June 2013 13:40
Subject: Europa-List: 912UL operating temperature
--> <lamprey.richard@gmail.com>
Greetings to all from Kenya.
Does anyone know what is the minimum cylinder head (coolant) temperature for
normal operations? The manual gives maximum but no minimum, save for
warming up to above 50C for takeoff power. I was told recently that
cylinder head temp should not be too much below Oil temp, but not sure about
this.
Some years ago I had new radiators made by Docking Engineering of
Silverstone, after a leak in the Europa ones. They have proved so efficient
that I cannot get the temp much above 105C after prolonged climb, and it
settles to 80-90C in the cruise, against an oil temp of 105C. I put
blanking strips on them to get the temp a bit higher, to 95C, but took these
off to test recently, and down the temp went. The plugs are fouling up with
carbon more now (with the odd missed beat), which according to the manual is
caused by running too cool. But I cant find that optimum operating
temperature stated anywhere. Any ideas appreciated.
A very simple Europa... 912UL, warp-drive fixed pitch.
Best
Richard
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=402782#402782
Message 4
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| Subject: | Europa fly-in - Popham |
I am afraid I will not be able to fly to Popham next week end. Have a look at the
webcam on the airfield where I landed yesterday and you will understand why:
http://www.aero-club-bordeaux.com/webcams/gwebcams1.aspx
The airfield is now closed. Those guys are untouchable and It may take at least
one week before the authorities can force them out, and a few more days to clean
their trash. What a pitty!
Yes, my aircraft is safely in a locked hangar.
Remi, grounded by NOTAM
Message 5
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| Subject: | Europa fly-in - Popham |
And I thought it was just the UK where the non tax payers had all the rights
and the law on their side!
Pete
PS Mind you if it was the UK the Department of Social Security would be
setting up an on site benefit office.
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Guerner Remi
Sent: 17 June 2013 17:13
Subject: Europa-List: Europa fly-in - Popham
I am afraid I will not be able to fly to Popham next week end. Have a look
at the webcam on the airfield where I landed yesterday and you will
understand why:
http://www.aero-club-bordeaux.com/webcams/gwebcams1.aspx
The airfield is now closed. Those guys are untouchable and It may take at
least one week before the authorities can force them out, and a few more
days to clean their trash. What a pitty!
Yes, my aircraft is safely in a locked hangar.
Remi, grounded by NOTAM
--
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Message 6
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| Subject: | Re: Europa fly-in - Popham |
Being a land owner our selves, We have a solution for this, and it only tak
es 10 minutes. Our herd of 100 dairy cows produce a lot of wast product. We
remove-the wast-from the farm with a Tractor and slurry spreader. It t
ake 10 minutes to spared about 1 X 10,000 lts load.- END OF PROBLEM!!!!
=0A=0A=0A-=0A=0AFrom: Guerner Remi <air.guerner@orange.fr>=0ATo: Steven P
itt <steven.pitt2@ntlworld.com>; Europa-List Digest Server <europa-list@mat
ronics.com> =0ASent: Monday, 17 June 2013, 17:12=0ASubject: Europa-List: Eu
i <air.guerner@orange.fr>=0A=0AI am afraid I will not be able to fly to Pop
ham next week end. Have a look at the webcam on the airfield where I landed
yesterday and you will understand why: =0Ahttp://www.aero-club-bordeaux.co
m/webcams/gwebcams1.aspx=0AThe airfield is now closed. Those guys are untou
chable and It may take at least one week before the authorities can force t
hem out, and a few more days to clean their trash. What a pitty!=0AYes, my
===========
Message 7
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| Subject: | Re: iPad battery charger |
Essentially all modern DC-DC voltage converters and chargers are based on switching
technology which uses a an RF range square wave generator to
shrink the size of inductors and capacitors. These devices spray RFI
like nobody's business, especially if the harmonics don't reach the television
bands (where the FCC might actually care ;) )
Given the size of the connectors on an iPad, and the embedded surface mount stuff
inside the connectors, I think adding bypass caps, even of
the surface mount variety would be nearly impossible. Easier to
filter the Comm system and power line into the 12V "cigarette" connector.
--------
Ira N224XS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=402884#402884
Message 8
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| Subject: | Re: Europa fly-in - Popham |
Do you lend out your Wealth Spreader?
From: Richard Wheelwright
Sent: Monday, June 17, 2013 10:58 AM
Subject: Re: Europa-List: Europa fly-in - Popham
Being a land owner our selves, We have a solution for this, and it only
takes 10 minutes. Our herd of 100 dairy cows produce a lot of wast
product. We remove the wast from the farm with a Tractor and slurry
spreader. It take 10 minutes to spared about 1 X 10,000 lts load. END
OF PROBLEM!!!!
From: Guerner Remi <air.guerner@orange.fr>
<europa-list@matronics.com>
Sent: Monday, 17 June 2013, 17:12
Subject: Europa-List: Europa fly-in - Popham
I am afraid I will not be able to fly to Popham next week end. Have a
look at the webcam on the airfield where I landed yesterday and you will
understand why:
http://www.aero-club-bordeaux.com/webcams/gwebcams1.aspx
The airfield is now closed. Those guys are untouchable and It may take
at least one week before the authorities can force them out, and a few
more days to clean their trash. What a pitty!
Yes, my aircraft is safely in a locked
h/www.matronics.com/Navigator?Europa-List"
target=_blank>http://www.matron; -Matt com/contribution"
target=_blank>http://www.matronics.com/contribution=======
====
No virus found in this message.
Checked by AVG - www.avg.com
06/16/13
Message 9
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| Subject: | Europa fly-in - Popham |
This is an aircraft forum, please find another, appropriate, forum for your
political opinions.
Terry
From: owner-europa-list-server@matronics.com [mailto:owner-europa-list-serv
er@matronics.com] On Behalf Of Michael Orth
Sent: Monday, June 17, 2013 11:31 AM
Subject: Re: Europa-List: Europa fly-in - Popham
Do you lend out your Wealth Spreader?
[obama-wealth-spreader]
From: Richard Wheelwright<mailto:rpwheelwright@yahoo.co.uk>
Sent: Monday, June 17, 2013 10:58 AM
Subject: Re: Europa-List: Europa fly-in - Popham
Being a land owner our selves, We have a solution for this, and it only tak
es 10 minutes. Our herd of 100 dairy cows produce a lot of wast product. We
remove the wast from the farm with a Tractor and slurry spreader. It take
10 minutes to spared about 1 X 10,000 lts load. END OF PROBLEM!!!!
From: Guerner Remi <air.guerner@orange.fr<mailto:air.guerner@orange.fr>>
>>; Europa-List Digest Server <europa-list@matronics.com<mailto:europa-list
@matronics.com>>
Sent: Monday, 17 June 2013, 17:12
Subject: Europa-List: Europa fly-in - Popham
to:air.guerner@orange.fr>>
I am afraid I will not be able to fly to Popham next week end. Have a look
at the webcam on the airfield where I landed yesterday and you will underst
and why:
http://www.aero-club-bordeaux.com/webcams/gwebcams1.aspx
The airfield is now closed. Those guys are untouchable and It may take at l
east one week before the authorities can force them out, and a few more day
s to clean their trash. What a pitty!
Yes, my aircraft is safely in a locked h/www.matronics.com/Navigator?Europa
-List" target=_blank>http://www.matron; -Matt com/contribution"
target=_blank>http://www.matronics.com/contribution=======
====
href="http://www.matronics.com/Navigator?Europa-List">http://www.matronhr
ef="http://forums.matronics.com">http://forums.matronics.com<http://www.m
atronhref=%22http:/forums.matronics.com%22%3ehttp:/forums.matronics.com>
href="http://www.matronics.com/contribution">http://www.matronics.com/c
No virus found in this message.
Checked by AVG - www.avg.com<http://www.avg.com>
Message 10
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| Subject: | Re: iPad battery charger |
Thank you Frans for your analysis and proposed fixes. Being too busy to work on
that issue right now, I will do it this winter and will go back to the forum
with the results.
Remi
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=402918#402918
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