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Skookum Robotics Skookum Robotics SK-360 SK-540 & SK-720 Digital Flybar


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Old 08-02-2015, 02:58 PM   #1 (permalink)
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Default swash plate geometry

OK so here is my situation...

I am building a larger scale helicopter and will be using Vario hanging mechanic (offshoot of their Skyfox model) to propell the helicopter.
The setup has four servos for swash...

I will be using SK720 blue controller ... and currently my mechanic setup has two options. I can fit short or long ball links to the swash plate... BUT only to the sides... front and aft have to be short to work as needed.


So if I put long ball links the push rods would be vertical... BUT the swash would form an elliptical shape instead of a circle.

My question is... would this be a problem for the FBL controller?
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Old 08-03-2015, 10:09 AM   #2 (permalink)
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It is probably better if you use the same for all 4 - otherwise you will have different resolution between aileron and elevator, effecting the gains and behavior for sure. if you choose on doing that you should try and compensate by taking the ball on the horn out so you maybe have similar travels for both cyclic axis.

I'm not sure about the mechanical conflicts. I can't think of any but there might be in some mixing options (I.E. elevator + cyclic + collective)
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Old 08-04-2015, 12:01 PM   #3 (permalink)
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I would not use 2 different length balls.
Hello binding, servo stalling, heat creating, servo failure... All in the near future.

That elipse will cause you trouble.
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Old 08-04-2015, 04:14 PM   #4 (permalink)
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ן don’t think there will be any binding, but I agree the elipse is trouble.
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Old 08-04-2015, 08:44 PM   #5 (permalink)
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Okay... Maybe a bit overboard. But 4 servo swashplates sucks for the reason that they have to be setup right to avoid and binding. Adding the elipse doesn't help anything.
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Old 08-04-2015, 11:12 PM   #6 (permalink)
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It wont be an issue if you set this up correctly. Aka make sure the servo travel values are correct between the two by changing the long/short throws to a level swash by changing servo end points. On center, top, then bottom.
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Old 08-05-2015, 02:20 AM   #7 (permalink)
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guys thank you for the inputs...
I was contemplating this issue for a few nights... read a few posts and a few manuals...
and decided not to play with fancy setups. I will leave all the ball links the same and try to minimize the angle of the side links...

I believe this would be best...

gh
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Old 08-05-2015, 04:59 AM   #8 (permalink)
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A little longer ball links to servo?
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