Great Lakes lake effect snow

"Tom S." wrote in message
...

"Tarver Engineering" wrote in message
...

"Mike Rapoport" wrote in message
.net...
This is true if the snow being produced is the flake type which
results
from
the direct crystalization of water vapor. The round "pellet" type
snow
results from the freezing of liquid cloud droplets. Clouds that are
snowing
a lot of pellet type snow have a lot of ice in them.

The smaller droplets being the more dangerous.

Rime ice? Why? That part breaks more easily from surfaces?

Icing is a statistical phenomenon and smaller droplets are more likely to
form ice on wing and rudder surfaces. (ie rudder reversal)

Icing is a statistical phenomenon and smaller droplets are more likely to
form ice on wing and rudder surfaces. (ie rudder reversal)



What is "rudder reversal"?

Jose

--
(for Email, make the obvious changes in my address)

"Teacherjh" wrote in message
...

Icing is a statistical phenomenon and smaller droplets are more likely to
form ice on wing and rudder surfaces. (ie rudder reversal)

What is "rudder reversal"?

Rudder reversal is a when the pilot commands rudder in one direction and the
airplane reacts as though opposite rudder was commanded. In icing
conditions, small GA aircraft are especially suseptable to flow seperation
due to icing of tail surfaces. Flow seperation is a known cause of "rudder
reversal".

You have it backwards, large droplets are more likely to hit the airplane
and form ice. Additionally large droplet ice is more lilkely to for beyond
the protected surfaces into ridges and horns which can cause airflow
separation.

Mike
MU-2


"Tarver Engineering" wrote in message
...

"Tom S." wrote in message
...

"Tarver Engineering" wrote in message
...

"Mike Rapoport" wrote in message
.net...
This is true if the snow being produced is the flake type which
results
from
the direct crystalization of water vapor. The round "pellet" type
snow
results from the freezing of liquid cloud droplets. Clouds that are
snowing
a lot of pellet type snow have a lot of ice in them.

The smaller droplets being the more dangerous.

Rime ice? Why? That part breaks more easily from surfaces?

Icing is a statistical phenomenon and smaller droplets are more likely to
form ice on wing and rudder surfaces. (ie rudder reversal)

"Mike Rapoport" wrote in message
ink.net...
You have it backwards, large droplets are more likely to hit the airplane
and form ice. Additionally large droplet ice is more lilkely to for
beyond
the protected surfaces into ridges and horns which can cause airflow
separation.

I got my information from John Brownlee FAA flight test pilot. He gives a
pretty interesting power point presentation on the subject.

"Tarver Engineering" wrote in message
...

"Tom S." wrote in message
...

"Tarver Engineering" wrote in message
...

"Mike Rapoport" wrote in message
.net...
This is true if the snow being produced is the flake type which
results
from
the direct crystalization of water vapor. The round "pellet" type
snow
results from the freezing of liquid cloud droplets. Clouds that
are
snowing
a lot of pellet type snow have a lot of ice in them.

The smaller droplets being the more dangerous.

Rime ice? Why? That part breaks more easily from surfaces?

Icing is a statistical phenomenon and smaller droplets are more likely
to
form ice on wing and rudder surfaces. (ie rudder reversal)

Sorry, but you are recalling it backwards.

Mike
MU-2


"Tarver Engineering" wrote in message
news

"Mike Rapoport" wrote in message
ink.net...
You have it backwards, large droplets are more likely to hit the
airplane
and form ice. Additionally large droplet ice is more lilkely to for
beyond
the protected surfaces into ridges and horns which can cause airflow
separation.

I got my information from John Brownlee FAA flight test pilot. He gives a
pretty interesting power point presentation on the subject.

"Tarver Engineering" wrote in message
...

"Tom S." wrote in message
...

"Tarver Engineering" wrote in message
...

"Mike Rapoport" wrote in message
.net...
This is true if the snow being produced is the flake type which
results
from
the direct crystalization of water vapor. The round "pellet"
type
snow
results from the freezing of liquid cloud droplets. Clouds that
are
snowing
a lot of pellet type snow have a lot of ice in them.

The smaller droplets being the more dangerous.

Rime ice? Why? That part breaks more easily from surfaces?

Icing is a statistical phenomenon and smaller droplets are more likely
to
form ice on wing and rudder surfaces. (ie rudder reversal)

"Mike Rapoport" wrote in message
ink.net...
Sorry, but you are recalling it backwards.

Could be, maybe I'll dig out the URL later.


Mike
MU-2


"Tarver Engineering" wrote in message
news

"Mike Rapoport" wrote in message
ink.net...
You have it backwards, large droplets are more likely to hit the
airplane
and form ice. Additionally large droplet ice is more lilkely to for
beyond
the protected surfaces into ridges and horns which can cause airflow
separation.

I got my information from John Brownlee FAA flight test pilot. He gives
a
pretty interesting power point presentation on the subject.

"Tarver Engineering" wrote in message
...

"Tom S." wrote in message
...

"Tarver Engineering" wrote in message
...

"Mike Rapoport" wrote in message
.net...
This is true if the snow being produced is the flake type
which
results
from
the direct crystalization of water vapor. The round "pellet"
type
snow
results from the freezing of liquid cloud droplets. Clouds
that
are
snowing
a lot of pellet type snow have a lot of ice in them.

The smaller droplets being the more dangerous.

Rime ice? Why? That part breaks more easily from surfaces?

Icing is a statistical phenomenon and smaller droplets are more
likely
to
form ice on wing and rudder surfaces. (ie rudder reversal)

"Tarver Engineering" writes:

I got my information from John Brownlee FAA flight test pilot. He
gives a pretty interesting power point presentation on the subject.

Here's the poop from the weather study guide for my IFR training:

The size of the droplets and the frequency with which the strike the
aircraft are important because the character of the ice depends on
whether or not each drop freezes completely before another drop
strikes the same spot. If the droplets pile rapidly on each other
before being completely frozen, the unfrozen parts mingle and spread
out before freezing. If the droplets freeze completely before being
hit by another droplet, a large amount of air is trapped causing the
ice to be opaque and brittle.

and later,

Because of the low adhesive properties of rime, it is generally
readily removed by de-icing equipment.

and

CLEAR ICE - This type of ice has high adhesive and cohesive
properties. Unlike rime, it can spread from the leading edges, and
in severe cases may cover the whole surface of the aircraft.

(From the Canadian Forces Air Command Weather Manual, Chapter 9.) Of
course, the adhesive properties are irrelevant when I don't have
deicing equipment anyway, but the spread still matters.


All the best,


David