Turbulence and airspeed

wrote in news:
http://makeashorterlink.com/?S3CF25F9C

However the current FAR Part 23 gust requirements have changed
from those (30 fps) shown on the posted Flight Envelope. The current
requirements are as below.

Section 23.333: Flight envelope.
(c) Gust envelope.

(1) The airplane is assumed to be subjected to symmetrical vertical gusts
in level flight. The resulting limit load factors must correspond to the
conditions determined as follows:

(i) Positive (up) and negative (down) gusts of 50 f.p.s. at VC must be
considered at altitudes between sea level and 20,000 feet. The gust
velocity may be reduced linearly from 50 f.p.s. at 20,000 feet to 25 f.p.s.
at 50,000 feet.

Bob Moore

Thank you--especially for paying attention to the details. I don't
have a copy of part 23.
I'll update my diagram.

The primary point of the whole exercise was that there was much more to
the Va issue than just "slow down to Va and you can do what you want".
I was very surprised at what I learned when I was challenged to look
into the details.

Va is pilot input to the controls, Vb is turbulence.

FAR Parts are all available at www.faa.gov



--
James H. Macklin
ATP,CFI,A&P

--
The people think the Constitution protects their rights;
But government sees it as an obstacle to be overcome.
some support
http://www.usdoj.gov/olc/secondamendment2.htm
See http://www.fija.org/ more about your rights and duties.


wrote in message
ups.com...
| Thank you--especially for paying attention to the details.
I don't
| have a copy of part 23.
| I'll update my diagram.
|
| The primary point of the whole exercise was that there was
much more to
| the Va issue than just "slow down to Va and you can do
what you want".
| I was very surprised at what I learned when I was
challenged to look
| into the details.
|

I hit some bigtime thwaps between Carson City and Lake Tahoe once.

We can still try. Reminds me of the joke about teaching a
pig algebra. Wastes your time and annoys the pig.


"Bob Moore" wrote in message
. 121...
| "Jim Macklin" wrote
|
| Va is pilot input to the controls, Vb is turbulence.
|
| I've been preaching this for years Jim, to no avail in
this
| group.
|
| Bob Moore

Well, Va is placarded on the instrument panel and is in the POH in most
planes. How do I find out what Vb is for my airplane (a 1996 Aviat
Husky)?

Jim Macklin wrote:
Va is pilot input to the controls, Vb is turbulence.

To learn something new, all I need to do is try to show I already know
something. :)

I'd never run across Vb before. I'll figure out how to include that.

Thanks again.

The list is in FAR Part 1. It is changed every so often, as
new terms are added. From Google
Vg Diagram
Vg Diagram. The flight operating strength of an airplane is
presented on a graph
whose horizontal scale {should be vertical scale -Ed.} is
based on load ...
avstop.com/AC/FlightTraingHandbook/VgDiagram.html - 5k -
Cached - Similar pages

The Zoom Maneuver - FCI Emergency Maneuver Training
Referring to the VG Diagram below, we see a distinct
boundary shown as a ...
On this VG Diagram, we can see the 1-G stall speed is
approximately 63 kts. ...
www.fcitraining.com/vid_clip7_zoom_maneuver.htm - 27k -
Cached - Similar pages

FCI Emergency Maneuver Training: Effectively Recovery from
....
Below is a velocity versus G-loading (VG) diagram or as
the test pilots call it
... VG Diagram. The airplane will stall if you attempt
flight outside of the ...
http://www.fcitraining.com/article2_...ning_oct02.htm -
40k - Cached - Similar pages

Gleim FIRC - Easy Does It
VG diagram? Can you say, "ARGH"? Stability, controllability,
and maneuverability?
Can you say, "SNORE"? I attacked Lesson One with the hope
that, perhaps, ...
www.avweb.com/news/reviews/181574-1.html - 39k - Cached -
Similar pages

[PPT] Vg DIAGRAM
File Format: Microsoft Powerpoint - View as HTML
Vg Diagram. Maneuvering Speed (Va), a Significant.
Limitation. 0. 1. 3.8. -1.52.
5.7. -2.8. CESSNA 310. CATASTROPHIC. AIRFRAME. STRUCTURAL.
FAILURE ...
www.faa.gov/about/office_org/
field_offices/fsdo/orl/media/ppt/pres.ppt - Similar pages





wrote in message
oups.com...
|
| Jim Macklin wrote:
| Va is pilot input to the controls, Vb is turbulence.
|
| To learn something new, all I need to do is try to show I
already know
| something. :)
|
| I'd never run across Vb before. I'll figure out how to
include that.
|
| Thanks again.
|

Oh Boy! More Reading!
I always did like the Vg diagrams. Honest!
The one on the AvWeb site looked good, but too small to read and it
won't enlarge. Maybe I'll email AvWeb and get a better copy.

Thanks for the links.

"gyoung" wrote in message
news:A8uHf.174246$oG.52951@dukeread02...
snip
But back to Jay's question: What might explain why airspeed increased in
turbulence? Here's another idea - a phenomenon described in the April/May
2005 issue of Air & Space Smithsonian, an article that discusses flying
sailplanes and an phenomenon they call "dynamic soaring". I really don't
understand it well, but it seems to be that one can 'gain energy' for the
'aircraft system' by "exposing the airplane's belly to stronger winds" for
brief periods of time, flying back into winds not so strong, returning to
the stronger winds, and going back and forth. So, I guess the airplane
extracts some energy from the stronger winds (weakening them I assume),
and uses that energy to go faster (or in the case of sailplanes, stay
aloft longer). What do you think?


This seems similar to what John Denker refers to as the "albatross effect"
http://www.av8n.com/how/htm/maneuver.html#sec-albatross
see section 16.17.2

Happy landings,