Today's Message Index:
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1. 12:37 PM - 914 w/intercooler induction air heating (pasj66)
2. 02:06 PM - Re: 914 w/intercooler induction air heating (Gilles Thesee)
3. 03:17 PM - rotax 912 over-run experience (ndibiase)
4. 03:30 PM - Re: 914 w/intercooler induction air heating (rparigor@suffolk.lib.ny.us)
5. 08:42 PM - Re: 914 w/intercooler induction air heating (Evan Gardiner)
6. 11:27 PM - Re: 914 w/intercooler induction air heating (pasj66)
Message 1
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| Subject: | 914 w/intercooler induction air heating |
Hi all,
I am searching for some info on the temperature difference between airbox temperature
and ambient during flight. JAR 23.1093 states if the temperature rise is
more than 56 deg C when ambient temperature is -1 deg C at 60 % power there
is no need for carb heating. In JAR-VLA 1093 the temperature rise should be 38
deg C with the same conditions. Has anyone with a 914 w/intercooler done some
flight tests? Installing carb heating is a bit of a hassle so I hope anyone have
done these tests to find out whether it is necessary. If anyone can share
their findings that would be most helpful.
Best regards
Patrik
(MCR R100 914 w/intercooler 85 % finished)
--------
MCR R100, R914UL3 W/IC
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| Subject: | Re: 914 w/intercooler induction air heating |
Patrick and all,
> I am searching for some info on the temperature difference between airbox temperature
and ambient during flight. JAR 23.1093 states if the temperature rise
is more than 56 deg C when ambient temperature is -1 deg C at 60 % power there
is no need for carb heating. In JAR-VLA 1093 the temperature rise should be
38 deg C with the same conditions. Has anyone with a 914 w/intercooler done some
flight tests? Installing carb heating is a bit of a hassle so
Remember those rules have been written by people used to Lyco/Conti
aircooled engines, with hot air as the sole means of avoiding carb ice.
We are flying an MCR 4s with an intercooled 914. Due to our engine
installation peculiarities, our carb temperatures are within the 40-50C
range in flight. Whatever the air temperature, remember ice cannot build
up on warm metal.
But it all depends on your particular engine installation.
With a proper airbox around the air filter, it is no big deal to devise
a warm air door into the engine compartment.
FWIW,
Best regards,
--
Gilles
http://contrails.free.fr
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| Subject: | rotax 912 over-run experience |
Someone as experience with over run 912 ULS engine and (bad) consequence ?
In fact after renting to a friend of mine my loved airplane (with a variable pitch
propeller with stops too light loaded - so possible over run ) i experience
a power loss.
Spinning by hand my prop seems that one cylinder has less compression than the
other (I'll ask my local rotax representative do a compression check and i suspect
something happened in valves seats or timing rods ).
But in my experience it is almost impossible to damage a rotax 912 with overrun.
Rotax officials said me that they have seen 6800 rpm for tens of seconds with
no damage...
I know that rotax says that over 6100 rpm for ......you must check all the engine
but often reality is less tragic!
any stories or knowledge ?
thanks
Nicola di Biase
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| Subject: | Re: 914 w/intercooler induction air heating |
Hi Gilles
"our carb temperatures are within the
40-50C range in flight. Whatever the air temperature, remember ice
cannot build up on warm metal."
Curiosity question, what
is your carb temperature when you pull power to a low power
settingor 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)?
Have you ever gotten carb ice?
If yes did making some
BTUs cure it?
Thx.
Ron Parigoris
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| Subject: | Re: 914 w/intercooler induction air heating |
Hi guys,
Apparently a 914 powered MCR generates more ambient heat in the engine cowl
ing than the 912 S powered MCR ULC that I have. I have attached a temp. pro
be to a carburator body and it never rises above 25 degrees C during what a
ppears to be carb ice conditions. If the temp. ever starts to fall below 19
degrees, (displayed on the panel) I know it is time to activate carb heat.
I leave it on until the temp. rises above 23 degrees again. As you note, i
ce will not stick on warm metal.
Here in New Zealand we sometimes have quite pronounced carb ice conditions.
After 3 such forced landing events without a carb heat facility I fitted a
flap to close off the outside ram air just to have some control over the s
ituation. It is now quite interesting watching the correlation between the
rising temp in the airbox, which I also moniter, and the temp of the carb b
ody. Takes a few minutes sometimes - but it is less stressful than looking
for somewhere to land with no noise up front!
Regards,
Evan Gardiner
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| Subject: | Re: 914 w/intercooler induction air heating |
Hi Gilles,
I have visited your web site quite often the last year during the assembly of our
MCR. Very helpful and informative. 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.
Best regards
Patrik
--------
MCR R100, R914UL3 W/IC
Read this topic online here:
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