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Old 11-21-2019, 01:05 PM   #1 (permalink)
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Default Logo 600 How important is it to have 16mm on cyclic horns?

I have some really nice aluminum horns I wanted to use on my logo 600sx build but the shortest hole is 18mm, however the manual is calling for 16. When looking at the swash from the top the links look pretty straight by eye.
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Old 11-21-2019, 01:53 PM   #2 (permalink)
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Heard and have always gone by a rule where if the collective values in the vbar program are at more than 90% to get at least 12 degrees pitch, then the balls are at a good position on the servo horn and will yield good resolution.

Excerpts from Mikado
Quote:
Collective values
"Values between 80-110 for 12-14į indicate that the geometry of the rotor head is well suitable for a flybarless system."

Cyclic ring
"limits the combined output of aileron and elevator if the control inputs are both together exceeding 100 %. You can use it to adjust the maximum throws of your swash plate to avoid binding and damage to the mechanics and the servos. The default value is 85. To check, move the collective stick to 50 % and at the same time input full aileron and elevator throw. In case of binding, lower the value until the mechanics no longer bind. Values below 75 will start to limit the clean aileron and elevator outputs, too. In this case, check if you can modify the geometry of the rotor head and linkages."

8 degree cyclic value setup
"Values between 80-100 indicate that the geometry of the rotor head is well suitable for a flybarless system."
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Old 11-21-2019, 03:42 PM   #3 (permalink)
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I know all of this but since Iím only at the step of installing servos is why I ask so I donít have to do it twice. The 16mm actually looks like it would make the links angle outward from swash to servo


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Old 11-21-2019, 04:21 PM   #4 (permalink)
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From Edward Eckstein of Mikado Germany

Quote:
As to the balls on the servo arms: the proportion of servo arm length to swash movement (giving a certain cyclic and collective ratio) is more important than straight links under the swash.

If you like to fiddle, try both positions and see the difference in the VBar setup on the Collective and Cyclic Tab in Setup

Kind regards

Eddi

Born to fly ...
forced to work.
Manual says 16mm, but 18mm should work as long as your values comes out correct.
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Old 11-22-2019, 02:08 AM   #5 (permalink)
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Quote:
Originally Posted by RappyTappy View Post
...
Manual says 16mm, but 18mm should work as long as your values comes out correct.
exactly... BUT it will be hard with most actual servos on a 600SX with current swash to get 'good' values. i've been trying on mine (Lynx 690 swash) with nice 18mm aluminium horns i had... i ended up with a value of 74 on NEO (Mini/Blue could be different)... so i replaced with CF horns with +/-16mm i had => result was 82. more or less the same with my Diabolo... the original 18mm horns gave vbar results of 72-73 and shorter horns resulted in 84. both are flying perfect.

be sure to check cycling ring too... i was able to have higher CR than default. super-agile birds!

Ciao
Michael
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