OK. I would not like anybody to get me wrong on this issue, and be accused
of trying to push other builders to make widows and orphans. I believe
that if you have a carb, then you would be well inspired to build a carb
heat. This being said, there are many contributing factors to icing, and
therefore, depending on where and when you fly, and how your engine is
rigged, if you don't have a carb heat, then you might get away with it, as
my aircraft did for more than 400 hours.
In my case, the carb heat is not a legal requirement, and it is fairly low
on my list of priorities. Of course, I will make one... ultimately. And in
the mean time, I will rely on a combination of risk-reducing factors
(airflow from inside the cockpit is one), plus the fact that the flight
tests to reinstate the aircraft will take place at or in the immediate
vicinity of a large airfield.
(And I will avoid long descents with a low power setting, which are also a
contributing factor)
Serge Vidal
KR2 "Kilimanjaro Cloud"
Paris, France
"Colin Rainey" <brokerpilot9...@earthlink.net>
Envoyé par : krnet-boun...@mylist.net
2005-09-29 16:48
Veuillez répondre à brokerpilot96ta; Veuillez répondre à KRnet
Remis le : 2005-09-29 16:48
Pour : kr...@mylist.net
cc : (ccc : Serge VIDAL/DNSA/SAGEM)
Objet : KR> Carb Ice
No matter how many examples pilots can say how they have not had any
problems with carb icing, my question is: 1. Why take the risk? and 2. Do
you really know what it is when it happens? I have iced 3 times here in
Florida, at low altitudes below 2000 feet, and in all 3 cases it came on
with symptoms akin to bad plugs, wires etc.... just like some KR builders
have talked about when testing! My Zenith Carb iced at 1500 feet at
nearly wide open throttle, so no wives tails about how that can't happen
either. The Cessna 172R I flew just yesterday has fuel injection, NO
alternate air (my correction there) throttle body unit located on bottom
of engine for radiant heat, and still has the intake plumbed through the
oil pan for further warming. None of these details are any KR builders
using on carb or fuel injection.
Fact is it can happen any where at any time when conditions are right.
High humidity, correct temperature, and cooling fuel thru the carb and
bingo, carb ice. Visible moisture makes it worse, but is not necessary.
Not having carb heat, OR insufficient carb heat will lead to an unplanned
landing! No venturi does NOT mean that you cannot get carb icing. The
slider still causes a pressure drop in order for fuel to flow, and with
the cooling effect of the fuel added to the intake air, you have carb ice.
A quick check of most modern cars will show as Virgil pointed out that
coolant is circulated in an area at or very near the throttlebody of all
fuel injected cars and trucks. Ford is BSing you. Get the truck fixed. It
has nothing to do with California. It has to do with them being lazy, and
not wanting to do a repair that they can only bill Ford for 75% of
customer pay!
Builders do what you want, but a short study of accidents where an engine
was lost for no apparent reason, and all the testaments here of its
necessity, and do yourself a favor and install and maintain carb/intake
heat.
Colin Rainey
brokerpilot9...@earthlink.net
EarthLink Revolves Around You.
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