Set Up 101
Rotor Head
Basics for CCPM Helis
Futaba 401 and 240 gyro setup guide
CSM 720 set
up and tips
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Instructions
Futaba 401 and 240 gyro setup
Mounting tape The supplied tape works fairly well but you
will find over time that the tape will separate and the gyro
will become loose, 3m style double sided tape also works well
with these gyros, there are many gyro specific tapes made
that work very well such as Zeal tape or csm tape. The Futaba
gyros can handle a very rigid mounting tape and still perform
as designed. Mounting the gyro as close to the main shaft
as possible is the preferred mounting point. 401 gyros differ
from the 240 in these areas 401 offers remote gain Digital
servo support Limit adjustments Delay adjustments
Radio setup for the 401
We need this gyro to be setup on a switch so that we can
switch from heading hold and normal mode (you may have to
activate the gyro function in the radio) Set the avcs mode
and normal mode percentages to 60 percent on the gyro function
screen, JR radios use 0 and 1 to dictate what is heading hold
and what is normal. Set the switch so that the gyro is in
normal mode (the light on the gyro will be blinking) Next
set up the tail servo link rod and servo arm length This will
be set by centering the servo arm on the servo (DO NOT USE
ANY TRIMS WITH THE 401 GYRO) the length of the servo arm is
a tuning option for all the gyros to get the best performance
for your application. Now you have the servo arm at roughly
90 degrees, center the tail pitch slider and adjust the tail
pushrod to length.
Checking servo direction and adjusting gyro
direction
TO check servo direction face the helicopter nose away from
you in a straight line position the tail rotor so that the
tail blades so that they are straight up and down Rotate the
top blade towards the front of the helicopter Give a right
rudder input from the radio the blade should move the same
direction as the stick of the radio if it does not you need
to reverse channel 4 in the radio and recheck your linkage.
Checking gyro direction Give a right rudder input and make
a mental not of the direction the servo arm is moving Now
grasp the heli and sharply rotate the model NOSE left and
note which way the servo arm rotated, if it is the same direction
as the right rudder input your done, if not you will need
to reverse the gyro direction on the gyro using the dip switches
and recheck your linkages again.
Flight testing in normal mode
Hover the model in normal mode and adjust the linkage rod
so that there is no drifting in the tail. Once this is accomplished
simply flip your radio switch for heading hold and normal
mode 3 times quickly. With the heli on the bench we now need
to reset the gyro limits Give a full rudder input and look
for binding of the tail pitch slider in both directions use
the limit pot on the 401 and adjust so that you get maximum
throw with no binding. IF your getting binding on the 240
you will need to shorten the servo arm and recheck everything.
Gyro gain settings
When in the hover you notice a wag of the tail back and forth
you need to lower the gyro gain for the mode you are flying
in, you want this set just a little lower than the wag point.
If you notice in forward flight that that tail is wagging
you will need to lower the gain also.
Using ATV/EPA for channel 4
Use of endpoint adjustments for controlling piro speed Lowering
the endpoints for channel 4 will slow the piro speed and will
not affect the limit adjustment on the 401, raising it will
increase the piro speed
Using expo for the rudder channel
You may feel that the tail is very touchy when giving a
command you can use expo to soften the feel of this. |
