fritzthecat
Key Veteran
Location: New Orleans
| Not a JR guy but try this:
There are two areas where servo direction can be changed. One is in the regular REV screen the other in the Swashplate section. The regular REV screen changes direction of individual servos, the swashplate screen changes direction of the entire function (i.e. all 3 servos for pitch).
Make sure the servos are plugged into the correct Rx slots. The elevator servo is the single servo that connects either to front or back of swashplate.
Set the servo reverse so that all three servos move the same direction when pitch is moved.
Set the swashplate pitch function (i.e change the + to - ) to change the direction of the pitch movement - if required.
Test elevator function. Again change the elevator +/- in swashplate menu.
Same with aileron function.
Here is a generic ECCPM setup:
ECCPM Setup
Preliminary Setup:
Radio system is assumed to be fully charged, correct model and modulation is selected, and servos are plugged into correct ports. Helicopter is fully assembled and has mainblades installed.
- Pitch Setup
- Disconnect linkages from all servos.
- Power up Tx and Rx.
- Select Normal Mode, ensure pitch and throttle curves are 0, 25, 50, 75, 100%.
- Set all trims to center, subtrims to 0, ATVs to 100%.
- There are two areas where servo direction can be changed. One is in the regular REV screen the other in the Swashplate section. The regular REV screen changes direction of individual servos, the swashplate screen changes direction of the entire function (i.e. all 3 servos for pitch).
- Pick one mainblade grip and mark the grip and blade. This will be the Master Blade. All setup adjustments will be done to this blade.
- Set linkage lengths according to the manufacturers manual.
- On the Tx move the pitch stick to the center position. On the cyclic/pitch servos, move the servo arms so they are at a 90 deg angle to the pushrods. Move the arms until a position is found as close to 90 deg as possible. If it is still a little off, use the Subtrims in the Tx to move the arms. Screw on the servo arms.
- Physically move the swashplate up and down. Find the center point of travel. This will be the Center/Zero point and the entire setup is referenced to this point.
- Look at bell cranks, mixing levers and washout levers. Adjust linkages as required to physically align all items to a 90 deg angle to pushrods, center of movement or level. The swashplate still stays at the center/zero point.
- Holding the swashplate so it stays at the zero point, adjust the length of the linkages so they connect to the servo arms.
- Install the pitch gage on the Master blade and move the blade perpendicular to the tailboom. The flybar should be exactly over the tailboom.
- Adjust linkages (usually the long links from the swashplate) on the main rotor head to obtain a zero pitch indication on the pitch gage.
- Now the Tx pitch/throttle stick is at center, swashplate is level at center/zero point, mainblade pitch is at 0 deg, all servo arms, bell cranks, mixing levers are at 90 deg to the linkages.
- Move the Tx pitch stick all the way up and down. Make sure the swashplate moves over the entire range of travel. If it does not, adjust the Swash Pitch CCPM percentages If it binds at the end of servo travel, reduce them. If the % is less than 30% or more than 80%, move the balls on the servo arms out or in and readjust the %s.
- At the full up and full down position check that all servos traveled the same amount and that the swashplate is still level. Adjust the individual servo ATVs so the swashplate remains level. Subtrims for level @ center, ATVs for level @ top and bottom. Swashplate CCPM % for total function travel.
- Using the pitch gage check mainblade pitch to be in the range of at least –10 deg to +10 deg. Some helis may have pitch in excess of -/+ 12 deg. Reduce the CCPM % to evenly to show -/+ 10 deg approximately.
- Adjust linkage on the other blade to match the Master blade pitch.
- Adjust elevator and aileron CCPM % to get a mainblade deflection of about 6 degrees when the Tx stick is fully deflected. The head with the mainblades must be rotated 90 deg to get both aileron and elevator deflection readings on the pitch gage. The flybar must be held steady while taking pitch readings on the blade.
- Now the Pitch/Cyclic part of the mechanical setup is complete. The up and down movement mirrors each other and the response is linear. At center stick, everything is centered/level: servo arms, bellcranks, mixing levers, swashplate and mainblades. Adjustment for flying style is done later.
Fritz
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