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Jeff(at)rmmm.net
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 Posted: Sat Jan 02, 2010 12:14 pm Post subject: Europa-Cold Cruse Temps |
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With all the starting temps being discussed can anyone spread some
light on minimums on cruising temps. Cold weather operation in the
manual covers carb icing concerns but it doesn't really cover cruising
temps. Maybe there isn't a reason to cover it. It's about 30 F outside
right now. Other then maybe covering some of the radiator can anyone
suggest other possible solutions to keeping the water temps up? Is
there a minimum CHT we should watch out for?
Happy New Year Everyone!
Jeff R. N128LJ Gold Rush
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Gilles.Thesee(at)ac-greno
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| Posted: Sat Jan 02, 2010 12:42 pm Post subject: Europa-Cold Cruse Temps |
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JEFF ROBERTS a écrit :
| Quote: |
With all the starting temps being discussed can anyone spread some
light on minimums on cruising temps. Cold weather operation in the
manual covers carb icing concerns but it doesn't really cover cruising
temps. Maybe there isn't a reason to cover it. It's about 30 F outside
right now. Other then maybe covering some of the radiator can anyone
suggest other possible solutions to keeping the water temps up? Is
there a minimum CHT we should watch out for?
Jeff and all,
|
The Rotax manuals do state the optimum cylinder head and oil temps.
One way to ensure proper temperatures is to use a correct cooling air
duct and cowl flap. Thus when you reduce airflow through the radiators,
you also reduce cooling drag.
Other ways include providing too large an air supply to the radiators
and blanking them up, or using an oil or water thermostat. But your
airplanes experiences excessive cooling drag all the time...
Some designer also combine poor cooling with excessive drag 
The basics of radiator aerodynamics can be seen here :
http://contrails.free.fr/engine_aerodyn_radia_en.php
The Europa cooling can be optimized, but this may imply some redesign of
the cowling and radiator ducts.
Happy New Year,
Best regards,
--
Gilles
http://contrails.free.fr
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Jeff(at)rmmm.net
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| Posted: Sat Jan 02, 2010 3:56 pm Post subject: Europa-Cold Cruse Temps |
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Gilles & All,
Yes the manuals state the optimized temps but my question is this.
Keeping in mind I have no engineering or mechanical background I
simply would like to know if there are known minimum sustained CHT
temps and if so what have others done to raise them? I have not flown
the Europa in very cold air and now that I have a heater I was
wondering if there are minimums I need to watch out for. For now I'm
only monitoring CHT and Oil temps.
Best Regards,
Jeff R. N128LJ Gold Rush
On Jan 2, 2010, at 2:41 PM, Gilles Thesee wrote:
| Quote: |
>
JEFF ROBERTS a écrit :
>
>
> With all the starting temps being discussed can anyone spread some
> light on minimums on cruising temps. Cold weather operation in the
> manual covers carb icing concerns but it doesn't really cover
> cruising temps. Maybe there isn't a reason to cover it. It's about
> 30 F outside right now. Other then maybe covering some of the
> radiator can anyone suggest other possible solutions to keeping the
> water temps up? Is there a minimum CHT we should watch out for?
>
Jeff and all,
The Rotax manuals do state the optimum cylinder head and oil temps.
One way to ensure proper temperatures is to use a correct cooling
air duct and cowl flap. Thus when you reduce airflow through the
radiators, you also reduce cooling drag.
Other ways include providing too large an air supply to the
radiators and blanking them up, or using an oil or water thermostat.
But your airplanes experiences excessive cooling drag all the time...
Some designer also combine poor cooling with excessive drag
The basics of radiator aerodynamics can be seen here :
http://contrails.free.fr/engine_aerodyn_radia_en.php
The Europa cooling can be optimized, but this may imply some
redesign of the cowling and radiator ducts.
Happy New Year,
Best regards,
--
Gilles
http://contrails.free.fr
|
| | - The Matronics Europa-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Europa-List |
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Gilles.Thesee(at)ac-greno
Guest
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| Posted: Sat Jan 02, 2010 4:34 pm Post subject: Europa-Cold Cruse Temps |
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JEFF ROBERTS a écrit :
| Quote: |
Gilles & All,
Yes the manuals state the optimized temps but my question is this.
Keeping in mind I have no engineering or mechanical background I
simply would like to know if there are known minimum sustained CHT temps
The engine owner manual sez :
|
| Quote: | CHT max 135°C
Normal operating temperature approx 75-110 °C.
In my understanding, 75°C can be considered as the minimum operating temp.
|
The green arc on our CHT gauge is therefore 75-110, et we ensure the
temps stay within those values in flight.
See http://contrails.free.fr/engine_liquide_refroid.php (scroll down and
click on the panel picture)
| Quote: | and if so what have others done to raise them?
We built a proper radiator duct and cowl flap, so keeping the temps
|
within the green range is easy.
As I mentioned, some just blank part of their radiator. But then the
drag is always high.
Best regards,
--
Gilles
http://contrails.free.fr
| | - The Matronics Europa-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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loboloda(at)execulink.com
Guest
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| Posted: Sun Jan 03, 2010 7:32 am Post subject: Europa-Cold Cruse Temps |
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Jeff,
Not an elegant solution, but for much of the year up here I have the
oil cooler partially blocked off with duct tape.
Normally will give me oil and coolant temps of around of around 185 F
in cruise.
WIsh it was 30 F here, this AM was 12 F with 2 feet of snow.
I need to install cabin heat, but will not get enough hot air from
the radiator, the front port exhaust pipe seems to offer the best
location for a heat muff.
If anyone has done this, I would like to get details.
Dave C-FBZI
On 2-Jan-10, at 6:56 PM, JEFF ROBERTS wrote:
| Quote: |
Gilles & All,
Yes the manuals state the optimized temps but my question is this.
Keeping in mind I have no engineering or mechanical background I
simply would like to know if there are known minimum sustained CHT
temps and if so what have others done to raise them? I have not
flown the Europa in very cold air and now that I have a heater I
was wondering if there are minimums I need to watch out for. For
now I'm only monitoring CHT and Oil temps.
Best Regards,
Jeff R. N128LJ Gold Rush
On Jan 2, 2010, at 2:41 PM, Gilles Thesee wrote:
>
> grenoble.fr>
>
> JEFF ROBERTS a écrit :
>>
>>
>> With all the starting temps being discussed can anyone spread
>> some light on minimums on cruising temps. Cold weather operation
>> in the manual covers carb icing concerns but it doesn't really
>> cover cruising temps. Maybe there isn't a reason to cover it.
>> It's about 30 F outside right now. Other then maybe covering some
>> of the radiator can anyone suggest other possible solutions to
>> keeping the water temps up? Is there a minimum CHT we should
>> watch out for?
>>
> Jeff and all,
>
> The Rotax manuals do state the optimum cylinder head and oil temps.
> One way to ensure proper temperatures is to use a correct cooling
> air duct and cowl flap. Thus when you reduce airflow through the
> radiators, you also reduce cooling drag.
> Other ways include providing too large an air supply to the
> radiators and blanking them up, or using an oil or water
> thermostat. But your airplanes experiences excessive cooling drag
> all the time...
> Some designer also combine poor cooling with excessive drag
> The basics of radiator aerodynamics can be seen here :
> http://contrails.free.fr/engine_aerodyn_radia_en.php
>
> The Europa cooling can be optimized, but this may imply some
> redesign of the cowling and radiator ducts.
>
> Happy New Year,
> Best regards,
> --
> Gilles
> http://contrails.free.fr
|
| | - The Matronics Europa-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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