Today's Message Index:
----------------------
1. 04:56 AM - Re: Cabin Throttle Lever/ Bowen Cable Connection (Thom Riddle)
2. 05:02 AM - fuselage "white" color - darkening? (Thom Riddle)
3. 09:38 AM - Strange behavior (Thom Riddle)
4. 04:48 PM - New Incoming Message Size Limit Implemented... (Matt Dralle)
Message 1
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| Subject: | Re: Cabin Throttle Lever/ Bowen Cable Connection |
--> Allegro-List message posted by: "Thom Riddle" <jtriddle@adelphia.net>
Hugh,
Here are a couple photos I took of what Dave described.
--------
Thom in Buffalo
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=52716#52716
Attachments:
http://forums.matronics.com//files/allegro_throttle_side_182.jpg
http://forums.matronics.com//files/allegro_throttle_top_244.jpg
Message 2
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| Subject: | fuselage "white" color - darkening? |
--> Allegro-List message posted by: "Thom Riddle" <jtriddle@adelphia.net>
Attached is a photo taken yesterday of the aft fuselage with a white plastic garbage
bag next to it for color comparison. It appears that the "white" of the
fuselage is darkening a bit over time.
Anyone else see this happening?
--------
Thom in Buffalo
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=52717#52717
Attachments:
http://forums.matronics.com//files/dsc00150_210.jpg
Message 3
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| Subject: | Strange behavior |
--> Allegro-List message posted by: "Thom Riddle" <jtriddle@adelphia.net>
During my BFR yesterday, the CFI put the Allegro into trimmed steady state flight
at about 80 mph IAS. Then he banked to the left about 45 degrees and neutralized
the ailerons and said "We are simulating a locked joystick condition, i.e.,
no elevator or aileron controls, only rudder and throttle. Get us safely out
of this unusual attitude." I left the throttle alone and eased in right rudder
and the Allegro resumed straight and level flight without too much adverse
yaw or other anomalies.
Then the CFI did the same thing with a right bank. Now comes the interesting Allegro
response. I eased in left rudder and it pitched slightly up with the yaw
and then abruptly went very sharply nose down, not just a little bit but in
steep dive angle. I caught it with the elevator and we both looked at each other
with the obvious question marks on our faces that said "WTF__K was that?" We
did it again from the right bank of about 45 degrees and this time I added the
rudder more slowly still but at some point of yaw, the same abrupt and severe
nose drop occurred which I caught again with the elevator. We tried it again
from a left bank, and as before, nothing unseemly happened.
What follows is my analysis of what was happening. I am no aerodynamicist so this
is just my best guess. In any case, whatever the cause, all Allegro pilots
should be aware of this.
Rudder only, by its very nature, is an uncoordinated maneuver. When in a steep
right bank and left rudder is added, the airplane begins to slip (high rudder,
no aileron). Remember that we were flying fairly slowly around 80 mph IAS and
the nose was pitched up and was also yawed left, thus allowing the higher (left)
wing and fuselage to block flow to the horizontal stabilizer. Insufficient
airflow over the elevator allowed the elevator to fall and the nose to pitch
down. Note that it takes about 25-30 mph of airflow during straight flight or
take-off run rather, to neutralize the weight of the elevator.
So why did it not do this on the opposite side? The only explanation I can think
of is the prop creates a rotating airflow (clockwise from pilot's view) along
and surrounding the fuselage. The airflow was blocked because of this rotational
direction. On the other side (left bank recovery) the yaw direction was to
the right and the rotating airflow was not blocked thus allowing maintenance
of sufficient airflow over the horizontal stabilizer and elevator precluding
the sudden nose down pitch response.
I'm considering trying a very light bungee on the joystick to hold it in neutral
with zero airflow. This will change the trim settings a bit, but not in such
a way that it is not predictable. Then I will repeat the maneuver at altitude
and see what happens. Another way to test this theory without the bungee is to
do it at higher airspeeds so the nose is not so pitched up and the airflow over
the tail may not be diminished enough to cause the sudden loss of elevator
power.
Fly safe!
--------
Thom in Buffalo
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=52774#52774
Message 4
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| Subject: | New Incoming Message Size Limit Implemented... |
--> Allegro-List message posted by: Matt Dralle <dralle@matronics.com>
Dear Listers,
Due to a number of requests to limit the size of incoming posts to the Lists because
of the recently added enclosure feature, I have add a new filter that will
limit the total size of any given message posted to the List. I have initially
set the limit to 2MB
and we'll see how everyone likes that.
If a member attempts to post a message that is greater than the set limit, they
will receive an email back indicating that their message wasn't posted to the
List and why. Also included in the message will be the current size limit and
how large their message
was.
Some might say that 2MB is still too large, but its a place to start...
Best regards,
Matt Dralle
Matronics Email List Administrator
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