Digital control throw meter
Electronic Technologies has developed a new way to digitally display
the amount of throw you set up on your planes control surfaces.
The digital readout features a very easy to read display featuring
½"high digits with up to .05 degree accuracy.
It also features a sign indicator for displaying positive and
A blue backlight in the panel can be turned on with the touch
of a button to light up the display if you desire.
The heart of the system is a sensor unit, having a 360-degree
range, which reports the angle of an object with respect to gravity.
Also included are (2) 5-3/8"x 2-5/8"x 3/16" Foam
padded plastic mounting plates, (2) nylon spring clamps and a
power supply that plugs into a standard 120VAC outlet providing
12VDC of power to the digital display unit.
The power supply has a 4'cord going to the Digital readout, and
a 6' cord from the digital readout to the sensor unit.
AeroPerfect also accepts a portable DC power source for making
control surface measurements at the airfield.
Attached to the underside of the sensor unit is one of the foam
lined plastic pads, which is held in place with (2) recessed mounting
screws. Self-adhesive Foam lines both sides of the other plastic
pad. Spring clamps hold the pads and sensor unit in place without
marring your finish.
use: Simply clamp the sensor to the control surface with
the provided plate and spring clamps.
Plug in the unit and power on the digital display. The push
buttons power the unit on, reset the unit zero angle, and
turn on or off the display back light.
Digit segments show unevenly in the photos, but actually are of
the left of the display unit are (3) small LED's. The middle green
LED comes on when the sensor unit achieves 0.00 degrees and turns
off once you deviate from that position in either direction. There
is also an audible click when the sensor unit has achieved 0.00
so you don't have to look at the display.
As an added feature, the other two LED's indicate upper and lower
degree ranges. The upper red LED illuminates after the sensor
achieves + 25 degrees or more. The red LED will remain illuminated
as you continue past +25 degrees and turns off again when you
drop lower than +25 degrees.
The lower LED works completely opposite from the upper LED. The
red LED will come on when you achieve -25 degrees or more and
turn off again when you are less than -25 degrees.
(Remember the sensor is capable of displaying your settings through
a plus AND minus 180-degree range!)
The nice thing is that any time you press the reset button while
the sensor is on any surface; you reset the display to 0.00 from
whatever angle your control surface is at that moment. After resetting
to 0.00 determined by your control surface (say in neutral), you
can now read the exact angle of throw in either direction on your
digital display as you adjust your surface deflection by radio
or mechanical means to dial in your desired throws.
sensor unit weighs a bit over 8.5 ounces, which can cause some
servo buzzing when left clamped to the control surface.
There are two ways to you can use the sensor unit. You can move
the control surfaces to their end points and hold the sensor unit
on the control surface supporting most of the sensors weight with
your hand as you read the display. This method would probably
be best on the smaller planes.
can also clamp the sensor unit to the control surface as I did
on the larger planes getting within ½ degree of where you
want it. I also helped the control surface a bit to remove the
buzzing and then read the display.
Once you try it a few times and decide which method works best
for you its really quite easy and accurate.
Another great feature is the AeroPerfect can accurately set up
separate elevator halves. This is usually a real hassle trying
to set each half at the same neutral and have exactly the same
throw in both directions.
I set the elevator halves on the 35% Extra 300L by first setting
trims and sub-trims to zero or neutral. Then I adjusted one half
of the elevator to the neutral position.
I then set the sensor unit on the neutral elevator half and pressed
the reset button on the sensor to obtain 0.00 degrees. Since it
remembers the zero setting from the first half, all you have to
do is move the sensor to the second half and adjust your surface
until you read 0.00. Both halves will now be at the same neutral
that your neutrals are set, you can adjust your throws to exactly
the same point in both directions by adjusting your EPA's (end
point adjustments). Or, if you have both servos set up on separate
channels, you can do this by using a Digital programmer or matchbox
until you obtain the same degree setting on the display for both