|
-
POSTING RULES

-
Donate yearly (please).
-
Advertise in here!
-
Today's Posts
|
Insert Pics
|

09-24-2010, 08:20 PM
|
 |
|
|
Join Date: Jan 2005
Location: Yorkshire, England
Posts: 2,052
|
|
Pierre,
Interesting - normally our 320/321/330's are rock solid in the cruise, however the mini busses do have a tendency to have a strange tail end roll movement when you are descending fast - 340kts.
Stops when you level to decelerate and configure to land
340kts to 15 miles is quite achievable...... 
|

09-24-2010, 09:01 PM
|
 |
VAF Moderator / Line Boy
|
|
Join Date: Jan 2005
Location: Dayton, NV
Posts: 12,256
|
|
I was playing with it a little more on the long cruise from California today - still there, but let me not overemphasise it. Many people wouldn't notice it at all. Definitely not a case of sensor quantization - we don't even see a tick in altitude or picth - it is simpply something I can feel. The interestign thing is that once you have it trimmed properly, it goes away - much "finer" trim indictaor than even the display can give you.
Paul
__________________
Paul F. Dye
Editor at Large - KITPLANES Magazine
RV-8 - N188PD - "Valkyrie"
RV-6 (By Marriage) - N164MS - "Mikey"
RV-3B - N13PL - "Tsamsiyu"
A&P, EAA Tech Counselor/Flight Advisor
Dayton Valley Airpark (A34)
http://Ironflight.com
|

09-29-2010, 09:41 AM
|
|
|
|
Join Date: Dec 2006
Location: Arroyo Grande, CA
Posts: 938
|
|
[quote=Alex;470069]It sounds like you have a classic example of a limit cycle going back and forth over a deadband boundary.
QUOTE]
As well as servo deadband, it might also be control-surface deadband due to boundary-layer buildup. There are a number of ways to alleviate this. One of these is to thicken the upper and lower leading-edge surface of the elevator by 10% of the thickness of the trailing edge of the horizontal stab. This thickening would have the appearance of a curved surface tangent to the edge of the gap and the following surface, more-or-less a quarter-round. In connection with this thickening, by blended it so as to produce a slighlty concave surface on the upper and lower elevator surfaces, this is even better. By doing this, three results will occur; the dead-band will be decreased, the horizontal surface drag will be reduced about 10%, and the flutter tendency will be reduced. Hooray for Bondo!
|

12-06-2010, 04:21 AM
|
|
|
|
Join Date: Nov 2010
Location: Australia
Posts: 53
|
|
Quote:
Originally Posted by pierre smith
Last December, my wife and I flew in an Airbus mailing tube, out to California, and the darn thing had the most annoying slight Dutch roll the whole way....very annoying but it would roll a couple degrees right, hesitate, then roll a couple degrees left...for thousands of miles!
The proud front crew were standing, thanking everyone as they de-planed and I hesitated and told the Captain, "Sir, don't be offended but I'm a CFI and your airplane did Dutch rolls all the way out here. The autopilot needs adjusting, I think." To which he replied, "I didn't think anyone would notice."
Best,
|
I noticed this in the cruise on my first jump seat familiarisation ride while converting to the 330. I think the 330-200 does it more noticeably than the 330-300 (the 200 is shorter). After 5 years I am used to it, but anyone down the back gets a rock and roll ride, especially in turbulence. Not uncommon to have people throwing up in the last couple of rows ;-)
|
| Thread Tools |
Search this Thread |
|
|
|
| Display Modes |
Linear Mode
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
All times are GMT -6. The time now is 01:36 AM.
|