RunRyder - Avant setup considerations......

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Avant Aurora - EFX - FX > Avant setup considerations......

stules
Senior Heliman
Location: Japan

Hi all and happy new year.
Just back from flying my EFX for the second time. All smiles, but damn it was cold. Below zero ice on the ground, and a touch windy. It feels horrible flying in gloves.......
A question directed to the honorable Augusto-san if I may.
I have just finished reading your thread on expo. I can follow the concepts, but not the math. Great work.

1.Since on the avant, the servo arm lengths and throws are all as per the manual, I dare say that you may have a good idea of what expos on the cyclics will approximate linear travel?

2.What are your recomendations for the cyclic expos? Is linear dsirable at all?

3.On the JR9303 under 'swash mix' is an option for 'exp'.
should this be ACT OR INH?

All the best
Regards Stuart

01-04-2006 Over year old.

balsapro
Senior Heliman
Location: Gallatin,TN

can you give me a link to augustos expo page. i tried searching for it but had difficulty finding it

Build the Best, Fly the Best, Crash the Best

01-04-2006 Over year old.

JKos
Elite Veteran
Location: City of California in the state of Maryland

> 3.On the JR9303 under 'swash mix' is an option for 'exp'.
> should this be ACT OR INH?

This setting should be turned on. It keeps your cyclic inputs linear as the swash moves up and down with collective. This might just answer your whole question. This setting is different than the other "expo" settings on the radio.

To show yourself what it does, leave it "INH" and observe how much the swash tilts with a full cyclic input at zero deg collective. Now go to full collective and observe the tilt. It will be less than at zero collective. Now "ACT" the feature and you'll see that you now get the same cyclic input throughout the collective range.

- John

Protos -- Logo 10

01-04-2006 Over year old.

Augusto
rrAdvertiser
Location: San Diego, CA

The original thread is here
http://www.runryder.com/helicopter/t4802p1/
And it's also in my gallery. It's called Linear Servo travel analysis.

Notice that the calculations on that thread apply to a circular travel driving a linear travel.

In the case of the Avant CCPM a circular travel servo horn drives a circular CCPM arm and this drives a circular movement on the cyclics because it's the swashplate balls rotate around the swashplate's center spherical bearing so it's inherently linear in response but a linear movemement on the pitch when the swashplate goes up and down. That said then if you like to have linear travel the only place you might want to have a bit of expo is in the pitch curve until it feels good to your style.

Augusto.

Avant Aurora Ultimate

01-04-2006 Over year old.

stules
Senior Heliman
Location: Japan

Thanks for the info guys, appreciated.
Back to the setup table (ironing board actually, but the girfriend is away....)
What is the recomendation for the cyclic expo's? Even personal preferences...
Stuart

01-05-2006 Over year old.

JKos
Elite Veteran
Location: City of California in the state of Maryland

> What is the recomendation for the cyclic expo's? Even personal
> preferences...

Zero for me. The Avant is FAST but not twitchy.

- John

Protos -- Logo 10

01-05-2006 Over year old.

stules
Senior Heliman
Location: Japan

Thanks, I will try zero for a change.
I tried your setup technique with the dial gauge on the swash. Picked up a cheap magnetic stand in Hong Kong for the parts to fit to the mainshaft. Works superb. Its the best method I have tried. Now even the individual subtrim clicks are too course of an adjusment.
Thanks for sharing your method.
Regards Stuart

01-05-2006 Over year old.

JKos
Elite Veteran
Location: City of California in the state of Maryland

No problem Stuart! I'm glad someone else thought it looked like a worthy method. It has worked very well for me.

Here is what he is speaking of:

- John

Protos -- Logo 10

01-05-2006 Over year old.

Siado
Senior Heliman
Location: Port Orchard, WA

I know this is dragging up an old thread, but I tried this tonight on my Avant FX while installing new servos. I used a simlar method to Jkos with a dial indicator fixed to the mainshaft and indicating a ball on the inner ring of the swash. I had seen your method in another post somewhere else and someone pointed out the inaccuracies of machining the swash introducing error into the method.

By indicating the same swash ball all and rotating the whole shaft/inner swash ring/dial indicator as one unit, there would be very little error introduced this way. I left my washout hub clamped around the mainshaft and the lower ball links attached to inner swash ring. This made sure that the swash ring stayed aligned with the dial indicator.

Bottom line is, no matter how you slice it, you can't argue with .002" difference between any one one of the three servo arms in a 120 degree CCPM setup.

Thanks for the idea Jkos! I love finding new uses for Starret stuff on my helis

Jim

07-29-2006 Over year old.

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Avant Aurora - EFX - FX > Avant setup considerations......

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