REFLECTOR: Turn Coordinator
Bud Williams
rambud at windstream.net
Thu Mar 12 13:14:04 CDT 2009
You do NOT need a yaw (slip/skid) indicator for VFR. In fact you do NOT
require ANY bank or slip/skid indicator for VFR. 91.205 contains what is
required for VFR day/night, IFR, and flight at and above FL240.
VFR (day):
Airspeed indicator
Altimeter
Magnetic direction indicator
Tachometer
Oil pressure gauge (for engines using pressure system)
Temperature gauge (liquid cooled engines)
Oil temperature gauge (air cooled engines)
Manifold pressure gauge (altitude engines)
Fuel gauge indicating quantity in each tank
Landing gear indicator (retractable gear)
VFR (night) all of the above plus:
Approved position lights
Anti-collision lights
Adequate source of electrical energy for all electrical equipment
One spare set of fuses or 3 spare fuses of each kind that are accessible to
the pilot in flight
Note: this does not include things such as shoulder harnesses, seat belts,
ELTs etc...I chose only to address the instruments and electric
requirements. Note also that a landing light is technically NOT required
since we can't fly these planes for hire
IFR :
All of the above (VFR day AND night) plus:
Two-way radio communication system and navigational equipment appropriate to
the ground facilities to be used (note that flight into Class B airspace
requires a VOR)
Gyroscopic rate of turn indicator (there IS an exception to this, but it
requires a third attitude instrument system usable through 360 degrees of
pitch and roll)
Slip-skid indicator
Sensitive altimeter adjustable for barometric pressure
A clock displaying hours, minutes, and seconds
Generator or alternator of adequate capacity
Gyroscopic pitch and bank indicator (artificial horizon)
Gyroscopic direction indicator
Not sure what you meant by "backup gyro", but as you can see, you are
required to have three separate gyroscopic instruments for IFR flight. EFIS
systems are able to satisfy the gyroscopic requirements through either
actual gyros, electronic gyros, or in some cases, ring laser gyros.
So to answer the original question of do you need a turn coordinator, the
answer is no. You do not need a turn COORDINATOR EVER, but you WILL require
at least a turn INDICATOR if you plan to fly IFR (or want to sell the
airplane, since there are probably few people who would want to buy an
airplane of this capability in a bare-bones VFR configuration).
Bud
-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Scott Derrick
Sent: Thursday, March 12, 2009 9:09 AM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Turn Coordinator
You need a backup gyro for IFR. You need a Yaw(slip/skid)
indicator(ball) for VFR basic instrument package.
You can use a 2nd AI for the backup gyro, I use a Dynon D10-A for both
backup and Yaw.
And you do use the rudders, in the pattern and for quick turns. She's
pretty ungainly at 100 knots making a turn to base or final with the use
of rudders.
Slipping on descent or final to increase your descent definitely
requires the rudders.
Also in turbulence at cruise speeds you can smooth things out a bit with
judicial use of the rudders.
Scott
Velocity wrote:
> This may be a dumb Question but I will ask it any ways.
> Do we need a turn coordinator in our plane?
> I have been told that you really do not use the rudders (Vertical
> Stabilizer)
> on this plane so what would the need be for the Turn coordinator?
> Extra Gyro???
>
> Ron
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