Travel adjustments and servo geometry

[Whirly-Girl]

Am I being too picky or overlooking something???

I'm currently setting up my elevator servo. After trying a cross servo arm, I switched to a small round arm. I mounted the servo arm ball in the hole that is exactly 10.5mm from center. I have one of HelicopterJohn's swashplate leveling tools...so I know my swash is dead-on level. The elevator arm levers are both pointing down...the one on the left is ever so slightly forward but can't be corrected because the teeth are too course of an adjustment on that lever. Now, with that being said, my sub-trim is zero and while setting up the end-point travel adjustments, one direction is going to 120% and the other 134%. That's a difference of 14% and I've read that you should keep them within 5% difference and right around 100% throw to maximize servo strength and resolution. Am I missing something or being to picky?

[NolanManley]

Your not being too picky. A good base mechanical setup is the KEY to getting all and ANY helicopter flying good and consistent.

You should get your center with all the servo arms at 90 degrees with all end point's set to 100%. After you have the swash level, the servo arms and linkages at 90deg with the swash (collective) set at mid travel. Before you do endpoints (ATV's), you can use sub trims to get the center points on the servos but all else should be adjusted mechanically with the linkages. With the swash at the center point of it's travel you then need to get your blades at "0" degrees pitch. Then check your +/- pitch travel, roughly +/-10 degrees is plenty. Set your end-points on the collective servo to get this. Don't forget to check the Aileron and Elevator deflection for binding and set the end-points accordingly to not bind and to limit travel to no more than 5 or 5.5 deg.

Now that I've said a lot more than you may have wanted :lol: , watch the setup videos that Shannon did on the fury CCPM. The basics of this will work on a non CCPM system you just don't have to worry about interaction like we do on CCPM systems.

Here's the links to the videos;

http://www.helifreak.com/about2740.html

http://www.helifreak.com/about2738.html

http://www.helifreak.com/about2739.html

I'm sure when you've watched ALL the videos once it will all make better sense.
Enjoy :D

Nolan