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Sep 18, 2015, 03:56 AM
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Blade 400 3D Swash setup.

I am very new to helicopters but do love to fix & learn. I purchased the Blade swash leveling tool and followed the directions. My question is that the directions make no mention of the front servo or linkage.
Can I presume that at mid stick the front servo arm should be 90 deg, the top & bottom attached control linkages nice and even which then relates to the bottom front swash linkage bar being level. And then adjust the final linkage to keep the swash level.
This is difficult to put into words. I trust somebody can understand and assist.
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Sep 18, 2015, 06:17 AM
Cá bhfuil Micheál?
spykez's Avatar
The front servo is via a bell crank mechanism.
Make the arms perpendicular to the long axis of the servo.
Make the mast arm receiving the rods parallel to the servo arm.
Get the output arm within the mast describing a plane normal to the main shaft.
Make the rods the same length and parallel.
Connect them up.

Because the arms and all are on splines, try and get it as close as you can. Sometimes flipping the arm gets you closer. You'll probably have to enter some subtrim to the channel.
Sep 18, 2015, 07:56 PM
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Thread OP
Thanks spykez.
I think we are on the same wavelength but just to be sure I added a picture.
No 1 Servo arm perpendicular to servo at mid stick.
No 2 These linkages the same length.
No 3 This arm is parallel to No 1 servo arm.
No 4 Horizontal/level, the same as the Left & Right servo arms
No 5 Adjust the length to allow swash to be level

This is my thinking. Correct ??

Sorry the picture has loaded twice and I cant seem to delete 1
Sep 18, 2015, 08:28 PM
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spykez's Avatar
Yup, pretty much that!

Select the best servo arm spline and just subtrim it as good as you can get.

Random advice.

Hitec servos are tall. It doesn't matter for the elevator, but you get the best geometry if you mount the balls on the servo arms on the under surface. Look, I wouldn't sweat it, but on the highest mounted servo, the alignment will be off most.

If you crash out your B400 head parts, a B450 flybar head will work as well. The only major difference is the blade grip to flybar and flybar to mixer arm linkage lengths are fixed on the B450 head.

Or just buy a B450X head, check servo compatibility and go flybarless!

Have fun!
Sep 18, 2015, 08:36 PM
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spykez's Avatar
Originally Posted by spykez
Or just buy a B450X head, check servo compatibility and go flybarless!

Have fun!
Actually scratch that.

Buy a Tarot 450 FBL head and go flybarless. Cheaper!
Sep 18, 2015, 09:24 PM
Registered User
Thread OP
Thanks again spykez. Your knowledge is appreciated. And especially the additional info on replacement/alternative parts.
Sep 19, 2015, 10:02 PM
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spykez's Avatar
Keep in touch, tell us how you're,doing with the thing. If ever you wish to ask anything, I'll do me best to answer or point elsewhere. I liked my b450 3d days.

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