sreuss
Senior Heliman
Location: Ontario, Canada
| Hi Pete,
After flying my first eCCPM heli about 5 years ago, and finding that after a crash I didn't have a recipe to recover the interaction free controls that I'd had before the crash, I spent some time thinking about eCCPM setup.
My conclusions regarding radio setup were as follows:
* start with subtrims and ATVs on CCPM channels at 0 and 100%, respectively
* aim to have your zero pitch(both cyclic AND collective) point to be at 50% output from the transmitter channel
* use the least amount of subtrim necassary to have your servo arms perpendicular to the linkages going to the swashplate (I know that others say not to use subtrim)
* move the collective to full pitch and observe what collective pitch you get AND how level the swashplate is (I'll assume here that you don't have any binding at the travel endpoint, because this will throw off the rest of what I propose)
* use the ATVs (I know that others say not to use ATVs) to level the swash at this max travel position. Note that changing the roll channel ATVs will also affect the for/aft level of the swashplate... Use this to your advantage; set the roll ATVs *first* and then use the elevator ATV to level the swash in the for/aft direction.
* go back to the zero pitch point
* now we're going to use *roll stick inputs* to set the negative pitch swash level. This is required; If you setup the negative pitch as you did the positive pitch, then you will likely end up with different travels on up and down servo directions. This will produce collective changes when roll inputs are given
* at zero collective pitch point, go to full right aileron and see if the SP goes up or down on the main shaft (i.e. the collective ineraction mentioned above).
* now adjust the ATV for the downward travelling servo until the right aileron inputs create no collective changes. You must modify only the downward travelling servo ATV since you've already set all up-travel ATVs.
* do the same for the left roll command
* now go to full negative collective and and modify the down-travel for/aft servo ATV to make the swash level in the for/aft direction.
At this point, you should have a SP that stays level through the entire pitch range and symmetrical output of the collective pitch (i.e. +/- same degrees). Note that the ability to realize this goal really depends on getting your linkage geometry as close to perfect for the zero pitch position.
Also, this setup will allow those who can't fly inverted to get a nearly perfect setup for inverted flying.
Now go and use the swash/ccpm travel settings to get your desired roll, elevator and collective pitch ranges.
Good luck, |
