|
Setting up the mini VBar governor for the first time can be a little confusing.
Here are some notes from my setup experience with a flybarless T-Rex 450
electric helicopter.
mini VBar with with two phase sensor plugs. + and - power plug into RX C. The
sensor wire goes to the top pin of RX A.
Helicopter Setup:
Heli: Align T-Rex 450 Pro
ESC: BL35X (Align Stock)
Motor: BL430SP (Align stock)
Phase sensor:
Hyperion RDU Phase Tachometer HP-EM2-TACHBL from allerc.com
Pinion: 13-tooth
Head: Align FBL
VBar Setup:
Gov I
tab:
Preset channel from receiver: 1
Output socket on VBar: RX B
Gov II
tab:
Max Headspeed: 3000
Gear ratio: 11.538 (150/13)
Sensor configuration: 3 (That is six "poles"--the
six magnets around the inside of the motor's "can," not to be confused with the
nine stator windings--divided by 2)
(The next two settings are probably very
transmitter-dependent and included just for reference.)
Motor off: -92% <-- the level at which the motor
*just* starts when you turn off Throttle Hold with the throttle in IU.
Motor on: 81% <-- there's a clearly audible
change at 80%. At 81% it's going all out (seems low though...)
Autorotation bailout: I haven't
enabled this yet, but I've been experimenting with it. The electric governor
setup pages at
www.vstabi.info/en say that if you set Throttle Hold
to anywhere from -90 to 0, the auto bailout feature will be enabled. Setting my
DX6i Throttle Hold to 16% (which gives -73% in VBar's "Output socket on VBar")
appears to be the threshold of consitently "arming" autorotation bailout.
Setting the
DX6i Throttle Hold to 20% throttle arms Autorotation Bailout reliably
which I can tell because the
governor ramps up to full speed in 2 seconds instead of 10).
Main
menu:
Gain: 30%
Transmitter
setup:
Calculate how much the headspeed changes for your Max Headspeed setting with
this
calculator, or just just divide the max headspeed value by 50 to get the
change increment for each 1% throttle change:
3000 RPM Max Headspeed / 50 = 60 RPM headspeed change for each 1% throttle
change.
IU Throttle: 97% <-- This gives a "requested
RPM" of 2820 RPM.
Normal Throttle: 92% <--This gives 2520 RPM.
Transmitter throttle % and
resulting headspeed with VBar gov "Max headspeed" set to 3000
% Throttle RPM
100.0 3000
99.0 2940
98.0 2880
97.0 2820
96.0 2760
95.0 2700
94.0 2640
93.0 2580
92.0 2520
91.0 2460
90.0 2400
Requested headspeed goes all the way to 0 at 50% throttle. (Note, however, that
efficiency is best when a motor is running close to its maximum speed.)
0% to 50% throttle: 0 RPM
Align BL 35X ESC programming:
Brake: Disabled
Timing: Mid-timing
Battery protection: High cutoff
Aircraft: Airplane
Throttle response speed: High
Voltage: 6 v
Notes:
-
The throttle is LIVE as soon as you select "Electric."
-
The setup
was behaving so strangely that I went back and read the instructions.
You have to hit Reset after you select "Electric." You really
do!
-
At one
point in the setup you control the throttle with the collective stick. Make sure
your pitch is set linearly from 0 to 100 or you will get weird results.
|