flybynightkarmarepair
January 30th 05, 10:35 PM
This is a cross-post from the AeroVee and AirVW Yahoo groups.
Injector carbs of interest:
AeroCarb
POSA
HAPI SuperCarb
Lake
RevFlow
Ellison
I have found one builder who describes a case of a Sonerai with a POSA
that liked to ice up in Texas.
http://groups.yahoo.com/group/aerovee/message/622
http://escribe.com/aviation/vw/m4920.html
Several others have responded with considerable experience and NO ice.
Anybody else out there?
--- In , jl <jeff@s...> wrote:
Lets do it this way.
Anyone who has had a complete engine failure due to carb or intake ice
with a THROTTLE BODY CARB, say so now.
Jeff
On Wednesday, January 26, 2005, at 05:32 AM, Tony Spicer wrote:
>
>
> ----- Original Message -----
> From: "robert lord" <robertnelsonlord@h...>
> To: >
> Sent: Tuesday, January 25, 2005 10:43 PM
> Subject: Re: [aerovee] No carb heat?
>
>> as someone just wrote their sonex with the cowl offuaing an aeroV
>> carb had
>> ice forming on the outside of the intake tube . What would make you
>> think
>> that a great deal more ice was not forming on the inside where it
is
>> much
>> colder with much more air and humidity being squeezed from the air.
>
> Robert,
>
> And did that "ice" disappear when carb heat was applied? Should you
> choose
> to install carb heat, be sure to do some testing so as to not be
> lulled into
> a false sense of security. Get a remote-reading digital thermometer.
> Mine
> was $12 at Lowes. Comes with a wire that is long enough to easily
> reach from
> engine compartment to cockpit. The thermocouple bead on the business
> end is
> glued into a plastic fitting with a dab of RTV. Use an Exacto knife
to
> carefully pry it out. Now it will fit thru a 3/32" hole. Route it
from
> cockpit to engine compartment. Just upstream of where the scat hose
> connects
> to the carb, cut a small slit and insert the thermocouple wire about
> 1/2"
> into the airflow. Clamp the wire to the duct with a tiewrap or piece
> of duct
> tape. Go fly. Run the engine at 75% power and note inlet temp. Apply
> carb
> heat and note temp. In a certificated aircraft, the FAA requires a
90
> deg F
> temp rise, but in an experimental, there's no requirement. Just
makes
> for a
> good comparison. Next, remove carb heat, pull throttle to idle, slow
to
> pattern airspeed, let things stabilize, and note temp. Pull carb
heat
> and
> note temp rise. Next, and most important, convince yourself that
> whatever
> you saw for a rise is sufficient to prevent ice from forming.
>
> When I moved into the neighborhood, I noticed my neighbors mailbox
was
> painted purple with large white polkadots. Asked him why, and he
said
> it was
> to keep the elephants out of his yard. Been here nine years, and
> haven't
> seen one yet. Must be working.
>
> And to maintain my consistency, I say for the third time "Make your
> decision
> on whether or not to use carb heat based on how you see the facts."
>
> Tony
Injector carbs of interest:
AeroCarb
POSA
HAPI SuperCarb
Lake
RevFlow
Ellison
I have found one builder who describes a case of a Sonerai with a POSA
that liked to ice up in Texas.
http://groups.yahoo.com/group/aerovee/message/622
http://escribe.com/aviation/vw/m4920.html
Several others have responded with considerable experience and NO ice.
Anybody else out there?
--- In , jl <jeff@s...> wrote:
Lets do it this way.
Anyone who has had a complete engine failure due to carb or intake ice
with a THROTTLE BODY CARB, say so now.
Jeff
On Wednesday, January 26, 2005, at 05:32 AM, Tony Spicer wrote:
>
>
> ----- Original Message -----
> From: "robert lord" <robertnelsonlord@h...>
> To: >
> Sent: Tuesday, January 25, 2005 10:43 PM
> Subject: Re: [aerovee] No carb heat?
>
>> as someone just wrote their sonex with the cowl offuaing an aeroV
>> carb had
>> ice forming on the outside of the intake tube . What would make you
>> think
>> that a great deal more ice was not forming on the inside where it
is
>> much
>> colder with much more air and humidity being squeezed from the air.
>
> Robert,
>
> And did that "ice" disappear when carb heat was applied? Should you
> choose
> to install carb heat, be sure to do some testing so as to not be
> lulled into
> a false sense of security. Get a remote-reading digital thermometer.
> Mine
> was $12 at Lowes. Comes with a wire that is long enough to easily
> reach from
> engine compartment to cockpit. The thermocouple bead on the business
> end is
> glued into a plastic fitting with a dab of RTV. Use an Exacto knife
to
> carefully pry it out. Now it will fit thru a 3/32" hole. Route it
from
> cockpit to engine compartment. Just upstream of where the scat hose
> connects
> to the carb, cut a small slit and insert the thermocouple wire about
> 1/2"
> into the airflow. Clamp the wire to the duct with a tiewrap or piece
> of duct
> tape. Go fly. Run the engine at 75% power and note inlet temp. Apply
> carb
> heat and note temp. In a certificated aircraft, the FAA requires a
90
> deg F
> temp rise, but in an experimental, there's no requirement. Just
makes
> for a
> good comparison. Next, remove carb heat, pull throttle to idle, slow
to
> pattern airspeed, let things stabilize, and note temp. Pull carb
heat
> and
> note temp rise. Next, and most important, convince yourself that
> whatever
> you saw for a rise is sufficient to prevent ice from forming.
>
> When I moved into the neighborhood, I noticed my neighbors mailbox
was
> painted purple with large white polkadots. Asked him why, and he
said
> it was
> to keep the elephants out of his yard. Been here nine years, and
> haven't
> seen one yet. Must be working.
>
> And to maintain my consistency, I say for the third time "Make your
> decision
> on whether or not to use carb heat based on how you see the facts."
>
> Tony