HELLO???? DOUGLAS????
Why are you spending big bucks on fancy
glass and not paying attention to the basics?
Add an AOA - independent of everything else
(and high on the glareshield) and your original plan will be excellent!
Why guess at low speed physics with your
life in the balance… literally?
Richard Freilich
P.S. Lose a friend or two because of
low speed maneuvering accidents (that could have been prevented) and you’ll
sound like a broken record also.
From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Douglas Brunner
Sent: Tuesday, May 29, 2007 11:51
AM
To: lml@lancaironline.net
Subject: [LML] Tru Trak ADI vs.
Standard AI
My panel is a dual Chelton panel with 3 backup instruments;
altimeter, air speed and Tru Trak ADI. I specified a Tru Trak ADI rather than a
standard Attitude Indicator because of price and the fact that the Tru
Trak could also show heading. In case of a failure of my dual Cheltons
(hopefully very unlikely) I would still have; altitude, air speed, heading and
attitude.
However, I have been re-thinking my choice of the Tru Trak
ADI for the following reason. The ADI does not display pitch, but instead
displays "gyro enhanced vertical speed". In most situations the
"gyro enhanced vertical speed" should parallel pitch. However
in a situation close to stall speed, I could be nose up but descending.
In this case the ADI (if glanced at quickly) could lead me to believe
that I was nose down and should pull back on the stick. A standard
Attitude Indicator would show me nose up and give me a better idea of the true
situation.
I spoke to the Tru Trak representative at Sun n Fun and he
stated that there are stall warnings built in to the system and that I could
"retrain" myself to interpret the ADI properly. Nevertheless, I
am concerned that in a difficult situation, I would interpret the Tru Trak in
the way I would a standard AI. Your thoughts and advice?
A drawback to going with the standard AI is the loss of the
heading information that the Tru Trak can provide. Of course, I would
still have my wet compass.