Today's Message Index:
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1. 12:01 AM - Official Usage Guideline [Please Read] [Monthly Posting] (Matt Dralle)
2. 11:42 AM - Tail Wag (Gary Graham)
3. 11:54 AM - Re: Tail Wag (Mlfred@aol.com)
4. 12:30 PM - Re: Tail Wag (Dan Checkoway)
Message 1
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| Subject: | Official Usage Guideline [Please Read] [Monthly Posting] |
DNA: do not archive
--> Rocket-List message posted by: Matt Dralle <dralle@matronics.com>
Dear Lister,
Please read over the Rocket-List Usage Guidelines below. The complete
Rocket-List FAQ including these Usage Guidelines can be found at the
following URL:
http://www.matronics.com/FAQs/Rocket-List.FAQ.html
Thank you,
Matt Dralle
Matronics Email List Administrator
******************************************************************************
Rocket-List Usage Guidelines
******************************************************************************
The following details the official Usage Guidelines for the Rocket-List.
You are encouraged to read it carefully, and to abide by the rules therein.
Failure to use the Rocket-List in the manner described below may result
in the removal of the subscribers from the List.
Rocket-List Policy Statement
The purpose of the Rocket-List is to provide a forum of discussion for
things related to this particular discussion group. The List's goals
are to serve as an information resource to its members; to deliver
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that is growing in size at an extraordinary rate. Try to be concise and
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responses.
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will hurt feelings, waste bandwidth and resolve nothing.
-------
[This is an automated posting.]
Message 2
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--> Rocket-List message posted by: Gary Graham <beeb@pcez.com>
Here is some "Tail Wag" theory based on asking, looking and flying. It all
started when I was a back seater in an RV-4 (~40 hrs) and a right seat in a
-6 (~30 hrs) while I was building my RV-4FB. My sensitivities to "tail wag"
(aft of the yaw axis) and a feet high siting position (back seat) manifested
themselves right from the beginning. Both issues have had my attention for
a long time. I had never suffered from motion. I am convinced that
turbulence is the cause of TW. As a passenger I could focus on the rapid
wing excursions from rough air and tie them to TW. Even better I could see
the aileron kick and tie that to yaw. How severe the problem, seems to be
related to the aileron nose design. On the early RV-4 it had a slight droop
(most TW). The flat bottom was next and I have seen a bottom nose up taper
on some of the newer ailerons (design change or savvy builders?) What is
the shape on the HR's and F1's.
The nose of the aileron ahead of the pivot point and the differential
deflection (up more than down or nose down more than up) cause the aileron
nose to drop below the bottom wing surface and cause form drag BEFORE the
opposite aileron can contribute opposing induced drag. For quick excursions
and with over shoot this causes TW. A by product of the feet off
coordinated turn design. You can simulate this with small side stick
movements at rough air rates.
We all try to mitigate TW by increasing the dampening effectiveness of the
vert. stab/rudder with foot pressure. Some designs add springs, dorsal
fins, more tail, stable shape, servos and weights etc. If you are building
the ailerons on your second Rocket/F1 you have an opportunity to check this
out. The rest of us have to weigh the effect and resulting discomfort of
the person in back (PIB). Pills and bags are inexpensive (vs. change).
Then there are short flights in smooth air.
I did read that Van's Air was looking at an aileron buffet that occurred at
full stick rolls. They were looking at the aileron leading edge, as I
recall. Design change?
Can anyone add to this ? Best shape ? Other designs ?
Gary, Flying a Rocket Lite. W/TW
Message 3
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--> Rocket-List message posted by: Mlfred@aol.com
In a message dated 9/2/2004 1:43:45 PM Central Daylight Time, beeb@pcez.com
writes:
Even better I could see
the aileron kick and tie that to yaw. How severe the problem, seems to be
related to the aileron nose design. On the early RV-4 it had a slight droop
(most TW). The flat bottom was next and I have seen a bottom nose up taper
on some of the newer ailerons (design change or savvy builders?) What is
the shape on the HR's and F1's.
The nose of the aileron ahead of the pivot point and the differential
deflection (up more than down or nose down more than up) cause the aileron
nose to drop below the bottom wing surface and cause form drag BEFORE the
opposite aileron can contribute opposing induced drag. For quick excursions
and with over shoot this causes TW. A by product of the feet off
coordinated turn design. You can simulate this with small side stick
movements at rough air rates.
Hmmm...I did have a set of ailerons made up for Reno last year that had a
raised nose, but I didn't think to see if they helped the TW problem. The ship
did require rudder coordination with that change -- not like a Champ, but there
was a bit more adverse yaw.
Also, all aileron chatter disappeared.
Cheers
Mark
Message 4
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--> Rocket-List message posted by: "Dan Checkoway" <dan@rvproject.com>
I'd be surprised if aileron droop drag is really the primary cause. Next
time I think to try it, I'll hold the stick rigidly centered while in
turbulence. I have a feeling it's still gonna wag pretty good if the rudder
isn't held rigidly.
do not archive
)_( Dan
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