icing

On Feb 14, 10:23*pm, "bumper" wrote:
At first I was going to skip this video as it's 23 minutes long. Please
watch it, there's not a boring moment. * *bumper

Thanks for posting.

Andy

On Feb 15, 1:15*pm, Nyal Williams wrote:
We had an incident in our club G-103 in which the forwqrd edge of the
elevator gap seal lifted on tow, rendering the elevator ineffective. The
glider pitched up under tow and full forward stick would not get the nose
down. The pilot released at about 50ft and was able to land straight ahead
using the trim tab. No damage, fortunately. *We have added that to our
pre-flight checklist.

At 05:23 15 February 2009, bumper wrote:





This video was mentioned on backcountrypilot.org. I figured I understood
tailplane icing, etc. But watching the video was an eye-opener. This also
very much applies to pilots who don't plan on flying in icing
conditions.
A
failed gap seal on a glider comes to mind as well.

At first I was going to skip this video as it's 23 minutes long. Please
watch it, there's not a boring moment. * *bumper

http://video.google.com/videoplay?do...23060735779946

Not just gap seals.

Gliders do pick up ice occasionally - usually in mountainous areas due
to flying through virga composed of Graupel or super cooled rain
drops. This type of ice accumulates fast and rapidly degrades L/D.

If you are over tiger country and depending on your glide ratio to get
home, it can be a tense situation. Your only de-ice option is to
descend below the freezing level which in spring or fall may be below
the mountain tops.

Thermalling with flaps sets up the same tail stall situation described
in the video.

"bildan" wrote in message news:e22ebaee-f089-4a42-
Not just gap seals.

Gliders do pick up ice occasionally - usually in mountainous areas due
to flying through virga composed of Graupel or super cooled rain
drops. This type of ice accumulates fast and rapidly degrades L/D.

Thermalling with flaps sets up the same tail stall situation described
in the video."

Agreed. My Mooney, with it's relatively thin wing, is known for its
inability to carry ice well. Modern glass ships, with their even thinner
airfoils and sharper leading edges, are worse still. Being a coward, I take
evasive action for lightning, hail, and ice.

bumper
QV & MKIII - best, cheapest present for your glider

Bumper

My turbo Mark 20C (6213 Uniform) didn't have boots so I didn't do
windows or ice.

Big John.

************************************************** *******************

On Tue, 17 Feb 2009 04:42:11 GMT, "bumper"
wrote:


"bildan" wrote in message news:e22ebaee-f089-4a42-
Not just gap seals.

Gliders do pick up ice occasionally - usually in mountainous areas due
to flying through virga composed of Graupel or super cooled rain
drops. This type of ice accumulates fast and rapidly degrades L/D.

Thermalling with flaps sets up the same tail stall situation described
in the video."

Agreed. My Mooney, with it's relatively thin wing, is known for its
inability to carry ice well. Modern glass ships, with their even thinner
airfoils and sharper leading edges, are worse still. Being a coward, I take
evasive action for lightning, hail, and ice.

bumper
QV & MKIII - best, cheapest present for your glider

bumper wrote:

At first I was going to skip this video as it's 23 minutes long. Please
watch it, there's not a boring moment. bumper

http://video.google.com/videoplay?do...23060735779946

Presumably, this video should put a stop to some contributors here who
insist that the tailplane does not provide a downward force. Great
video, thanks for passing it on.

Tony V.