Today's Message Index:
----------------------
1. 05:08 AM - Re: Intercooler (Robert Borger)
2. 06:15 AM - Re: Air Tour (Dave_Miller@avivacanada.com)
3. 07:43 AM - Re: Intercooler (Gilles Thesee)
4. 03:30 PM - Re: Intercooler (Jim Brown)
5. 07:11 PM - Wanted Europa Monowheel (SteveD)
Message 1
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Cc: rlborger@mac.com
--> Europa-List message posted by: Robert Borger <rlborger@mac.com>
Gary,
As the others have said, additional power is available due to a cooler, denser
charge of air. But there is another reason to add an intercooler. That hot,
compressed volume of air that comes out of the turbocharger is prone to cause
detonation. By cooling the air, you greatly reduce the chances for detonation
which is always a problem with turbocharged or supercharged engines. This is
the reason I chose to add the intercooler.
I have been told that by adding an intercooler, the 5 minute limit on max power
is no longer necessary. That limit was imposed to ensure the engine never went
into detonation. With the intercooler, one can use full power continuously.
Please understand that this is hearsay information and I have not proven or
tested it. Perhaps others more experienced in the area can comment.
Good building and great flying,
Bob Borger
Message 2
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--> Europa-List message posted by: Dave_Miller@avivacanada.com
Jim,
I tried to access the miaviation web-site without success, probably my
limited computer skills.
On the assumption that C-FBZI will be airborne once the weather improves,
I've marked Aug 26th on my calendar.
Only a couple of hours away from CYXU, if Chris Staines can be persuaded
to bring his mono we will have a couple of spare seats. Perhaps fellow
builders Ferg and Jan Volcic would join us.
Dave A061
Do not archive
"Jim Butcher" <europa@triton.net>
Sent by: owner-europa-list-server@matronics.com
03/09/2006 04:00 PM
Please respond to europa-list
To: "europalist" <europa-list@matronics.com>
cc:
Subject: Europa-List: Air Tour
--> Europa-List message posted by: "Jim Butcher" <europa@triton.net>
Bryan,
Another item for the event list is the Michigan Air Tour. While not a
Europa specific event it promises to be a way cool flying experience.
Basically over a period of 3 days, planes and crews will visit nine
airfields in Michigan's Upper Peninsula. This is flying over mostly wild,
forested land with breathtaking scenery and clear, unlimited visibility.
Each day you fly at your own pace but meet up at each airfield for food
and celebration. Everyone stays in the same hotel each evening. We're
planning to fly in it and think it would be wonderful to have more
Europas! For more information, go to www.miaviation.org.
While we doubt we'll ever be able to do Dave Watt's France tour, this
should be close!
Jim & Heather Butcher A185, N241BW
Message 3
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--> Europa-List message posted by: Gilles Thesee <Gilles.Thesee@ac-grenoble.fr>
Bob and all,
>As the others have said, additional power is available due to a cooler, denser
charge of air. But there is another reason to add an intercooler. That hot,
compressed volume of air that comes out of the turbocharger is prone to cause
detonation. By cooling the air, you greatly reduce the chances for detonation
which is always a problem with turbocharged or supercharged engines. This is
the reason I chose to add the intercooler.
>
>
That is also the reason we went the intercooler way.
>I have been told that by adding an intercooler, the 5 minute limit on max power
is no longer necessary. That limit was imposed to ensure the engine never went
into detonation. With the intercooler, one can use full power continuously.
Please understand that this is hearsay information and I have not proven or
tested it. Perhaps others more experienced in the area can comment.
>
>
>
I would be wary about that one, except if it came direct from the Rotax
development team.
Remember that with cooler charge temperatures, the engine delivers more
power than usual. If you use the same MP than non-intercooled, you are
asking more from your engine, not to mention higher and longer 39'
operation than recommended.
Note that Lycoming advises to use lower MP settings when intercooled for
that reasons.
The engine is less prone to detonation, but this does not justify asking
more than intended from it.
Besides, it is indeed a draggy airframe, that necessitates more than 5
minute takeoff power !
We chose to use the normal power settings with our intercooler, but I
retard the throttle to 100% as soon as I'm airborne. Our field has a
2000 ft grass strip, and we have ample room to operate at full weight.
Regards,
Gilles Thesee
Grenoble, France
http://contrails.free.fr
Message 4
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--> Europa-List message posted by: Jim Brown <acrojim@cfl.rr.com>
I have been following this thread on intercooler's and I will add a couple if things.
It goes without saying that the turbo, compresses air, and when you compress air
you get heat.
I have an early maintenance manual for my 914. In the section on the turbo, it
addresses the issue of the temperature probe that is installed in the "air box"
It is there to measure the inlet air temperature in the air box just before
the air goes to the carb's. The onset of detonation occurs at approximately 165
degrees F. air box temperature, on the 914 ,due to the compression ratio of
9 to 1. When the temperature probe registers
165 degrees F a command is then sent to the servo to open the wastgate, which
lowers the temperature going into the air box, which prevents detonation... You
normally will only get this high temp on take off with full boost and 5800 RPM
on a very hot day.
The intercooler simply lowers the inlet air temperature to a point where detonation
does not occur. Here in Florida, in the summer time its very easy to reach
the 165 degrees temperature, on take off with full boost, without an intercooler.
I feel that of you exceed the 5 minute limit, then you will be thermal stressing
the engine..
Jim Brown
Robert Borger wrote:
> --> Europa-List message posted by: Robert Borger <rlborger@mac.com>
>
> Gary,
>
> As the others have said, additional power is available due to a cooler, denser
charge of air. But there is another reason to add an intercooler. That hot,
compressed volume of air that comes out of the turbocharger is prone to cause
detonation. By cooling the air, you greatly reduce the chances for detonation
which is always a problem with turbocharged or supercharged engines. This
is the reason I chose to add the intercooler.
>
> I have been told that by adding an intercooler, the 5 minute limit on max power
is no longer necessary. That limit was imposed to ensure the engine never
went into detonation. With the intercooler, one can use full power continuously.
Please understand that this is hearsay information and I have not proven
or tested it. Perhaps others more experienced in the area can comment.
>
> Good building and great flying,
> Bob Borger
>
>
Message 5
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| Subject: | Wanted Europa Monowheel |
--> Europa-List message posted by: "SteveD" <Post2Forum@comcast.net>
Hi,
Looking for a Europa monowheel to buy. Min 100 HP, refer ROTAX engine. Please email
nicklandellmills@hotmail.com with details if this is of interest. Thanks
Nick
Saw this posted on EuropaOwners and thought I would send on to the list. If interested
please reply to Nick at the above Email address. (not sure what side of
the pond he's on )
Steved...
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