Today's Message Index:
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1. 09:04 AM - Re: 914 w/intercooler induction air heating (Gilles Thesee)
2. 10:39 AM - Re: Re: 914 w/intercooler induction air heating (Gilles Thesee)
3. 12:58 PM - Re: 914 w/intercooler induction air heating (Gilles Thesee)
Message 1
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| Subject: | Re: 914 w/intercooler induction air heating |
Hi Ron and all,
>
> Curiosity question, what is your carb temperature when you pull power
> to a low power setting or idle and you let the wind turn propellor
> (turbo not doing much in the way of rammin and jammin / hence warming
> and the intercooler is bringing down any rise in temp caused by turbo
> closer to ambient)?
>
According to my test curves, carb temps during descend never went below
40Celsisus on a cold day (OAT 5Celsius ground, -2 Celsius at altitude).
Of course, low power setting does not last long with our aircraft.
Due to the turbo running at dull red temperature just inches below the
carbs, temps can stay relatively high in a close fitting cowling.
>
>
> Have you ever gotten carb ice?
>
Never noticed anything, although I flew the aircraft in rain and drizzle.
>
>
> If yes did making some BTUs cure it?
>
Due to air low thermal capacity, charge air temperature doesn't play
much role compared to the red hot exhausts and turbo case.
Best regards,
--
Gilles
http://contrails.free.fr
Message 2
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| Subject: | Re: 914 w/intercooler induction air heating |
Patrick
Thank you for your kind words.
> Regarding carb heat the JAR specification has to be met somehow in order to get
a type certificate, and the fact that Dynaero does not offer a carb heat option
to their factory built 914 installations the pre certification flight tests
must have shown that it was not needed. I am waiting for a mail from dynaero
in this matter. In addition it is interesting to hear other peoples experiences.
As you may have noticed, our engine installation is quite different from
that of Dyn'Aero. We had to send a report with our carb temp number to
the certification authorities to get our certificate of airworthiness.
During ground tests, we had thick freezing fog to the point I was scared
to taxi on the apron lest we collide with a building, a car or an airplane.
After some time ground running at high power setting, we noticed a
slight vibration up front (no power loss nor MP variation). After
stopping the engine, we discovered that the whole airplane was covered
with frost in the prop wash, the air intake lips as well as the prop
leading edges were covered with several millimeter clear ice.
But the carb temps were as usual, and the vibration was attributed to
the ice buildup on the prop blades.
Best regards,
--
Gilles
http://contrails.free.fr
Message 3
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| Subject: | Re: 914 w/intercooler induction air heating |
Hi Bob,
Best wishes for 2009.
> I was concerned about carb. ice with an intercooler fitted to my 914
> installation. Especially when the Intercooler manufacturers (Bell)
> were claiming 25deg temp drop in Winter and 20deg drop in Summer.
>
This about what we get with our installation, with an optimized
intercooler inlet diffuser, and clean air exit nozzle.
If the diffuser is not optimal, or the intercooler cooling air exit has
any obstruction the efficiency will be much less.
> I have a crude temperature sensor reduxed into a plastic hollow tube
> to the port carb throat and have never seen less than 6 deg Celsius.
> Even descending on low power settings through thin cloud formation
> from 10,000ft after the wind screen *_in_* my Europa began to frost
> over on the *_inside_* with minimal cabin heat facility.
>
> Whilst I do understand that carb ice conditions are very humidity and
> ambient temperature connected this has left me "fairly" confident that
> ice is not an issue ( I am reluctant to actually say that since next
> flight ..!)
>
Interesting data. We are no longer monitoring carb temps.
Best regards,
--
Gilles
http://contrails.free.fr
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