700 How do you adjust the swashplate on a trekker 800 to zero at 50% pitch

[mb-1953]

I recently purchased a second hand Trekker 800 with an Ikon gyro. At 50% the swashplate shows 2 degrees of pitch. My problem is I can't figure out how to lower the swashplate with the linkage? What puzzles me is how to lower the elevator link arrangement, the aileron and pitch are straightforward solid links. Thanks.

 

[pvolcko]

You can not lower that elevator linkage. You set that so that the horizontal part is 90 degrees to the vertical arm (there should be a window in the side frames to see the horizontal arm so you set it so it is centered in that window). You then set the other two servo-swash links as needed to get the swash level. IT doesn't matter if the blades are 0 pitch at this point, what you want is a blade showing the same exact pitch reading around the full rotation of the rotor sweep. This will mean that your swash is level. Normally, however, you do not set swash level with this method, you either use a swash leveling tool or the old zip tie trick.


Once the swash is level and the servo horns are 90 degrees, you put the rest of the head assembly on the main shaft and then 0 the blades using the swash-bladegrip links.

If you intend to use the blade pitch as your measurement of swash level make sure you are using a manual dial pitch guage. Digital guages don't work well for that kind of measurement since zero reference is different at each point in the rotor sweep. Dial guages reference against a bar on the rotor hub or some other fixed reference (relative to the blade) so they work much better for that purpose.

 

[Tony]

Cleaned your post up for you.

 

[mb-1953]

i understand what you are saying but I believe the links from the blades to the swash are already at their minimum.

 

[Slobberdog]

Can you put a few pics of the sides and the head up as there must be something set up not quite right as it look like the rods should be specific lengths to get the correct angles on the bell cranks

 

[mb-1953]

I am trying to send pictures, not sure if I succeeded.

 

[Derek]

You had originally uploaded 5 images. Image number 1 and 2 were identical, so I deleted image number 1. Then I rotated each image for you because each image was on it's side.

 

[mb-1953]

Thanks Derek, sorry I am so lame with the computer. It took me 1/2 an hour just to send what I did.

 

[Derek]

it's no problem buddy! The more and more you post questions, pictures, videos....it all becomes easier and easier.

Glad to help.