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HomeAircraftHelicopterMain Discussion › Swash Expo
11-14-2011 06:47 PM  6 years agoPost 1
maveric4

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england

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Hi Guys,

I understand what swash expo is and what it does, and have it set for all of my models, along with expo set for each curve and 25% expo set at the D/R and expo menu.

I am in the process of converting a rex600 to fbl using the Dx7 radio.

So would you still recommend swash expo being active for a flybarless model or not.
The DX7 also allows expo to be set for each curve, would that be an issue with fbl and need to be avoided.

Finaly would you set maybe 20% to 30% expo at the dual rates and expo screen with a fbl model.

Going to use the align 3GX fbl module if that makes any difference.

Would just like to know what you fbl fenatics are using and what your recommendations are.

Many Thanks

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11-14-2011 06:53 PM  6 years agoPost 2
rudyy

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E. Amherst, NY

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Your radio is supposed to have one single servo set up for swash if you use FBL, not 120 or 140 ccpm. In other words, you will not be able to adjust both the swash expo and the swash cyclic travel setting in your radio.

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11-14-2011 07:45 PM  6 years agoPost 3
Chuckie

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Crofton Maryland

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I'm not sure about the DX7 but in my futaba I run different expos on idle ups. I'm using vbar and turn off expo in the unit. You don't want two expo settings on the same channel to confuse your self. Your post is a little confusing to me as I don't remember that in the DX7 you could set more than one expo value per channel.

Then in normal I run high expo for smooth flying, in idle I have 20% and in idle 1 5%. The lower expo values give me more response so the heli flys faster, so to speak, when I move the stick from center.

The expo value is based on what you prefer so one person may like 10 where you may like 20. Also remember the higher the roll rate (set by the FBL unit) the more expo you may need for a smooth flying heli. I set the roll rate first then go after fine tuning the expo.

Charles

Please stand by for faster service!

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11-14-2011 08:18 PM  6 years agoPost 4
BarracudaHockey

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Jacksonville FL

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Swash expo, or EXP
and aileron/elevator expo are two different things.

Andy
AMA 77227
http://www.jaxrc.com

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11-14-2011 09:10 PM  6 years agoPost 5
maveric4

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england

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Thanks guys for the replies.

BarracudaHockey

Ok looked back at my post and can see why it maybe missleading and not clear.

With the DX7 Swash exp cannot be set to any value, only selected or inhibited.
Exp under the pitch and throttle curves again can only be selected or inhibited.

Dual rates and expo can be set two any value to soften the feel around neutral stick position. typical values here maybe somewhere in the range of 5% to 30%. Some mayeven use more.

With all of my models I have all of these selected and use around 15% expo. All of these are flybarred.

Question is when converting to flybarless is it recommended to inhibit the above. Do the flybarless units compensate for the above and take that into consideration.
Problem I have is when exp is selected in the swash menu, it cuts the pitch end throws back some when initially setting up the unit and teaching it what the max pitch range is.
I need to either select swash exp or inhibit it before I can teach the unit the extent of the pitch range.

I will be using the align 3GX and with this unit it is neccessary to select swash 120 to use with a trex 600.

Hope this makes things a lot clearer, sorry for not being clearer first off.

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11-14-2011 09:27 PM  6 years agoPost 6
Mputu

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Killeen, TX

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Still little fussy but they way I understand that is this, when setting up your model with most FBL device there is no need to select the swash type but 1 servo. FBL device will do the rest. However, most FBL device allow you to control your DR/EXP tru your radio only for AIL/ELEV and RUD.

Fly hard, Land safe

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11-14-2011 09:46 PM  6 years agoPost 7
maveric4

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england

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Mputu,

Thanks for the post sorry I dint know how to make it any clearer.

Interesting comment on the one servo selection.
rudyy posted the same.

I accept what you are saying regarding one servo selection and note that you say most flybarless devices.
Unfortuantely the 3GX must be an exception as it clearly states to use the radios internal mixer. one for the record I guess.

You may be part way there in answering my question by saying that most flybarless systems allow for ail/ele/rud expo.

Just need to find out about the fixed EXP for the swash and pit/thro curves on the DX7 with the 3GX.

Hopefully someone will chime in.

Thanks again guys for your comments and your time to post back

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11-14-2011 09:47 PM  6 years agoPost 8
rudyy

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E. Amherst, NY

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Problem I have is when exp is selected in the swash menu, it cuts the pitch end throws back some when initially setting up the unit and teaching it what the max pitch range is.
I need to either select swash exp or inhibit it before I can teach the unit the extent of the pitch range.
OP, did you read my reply? You will lose the ability to perform any adjustment under the swash menu after you move to FBL.

It becomes a do not care case because the FBL unit will take care of it.

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11-14-2011 10:03 PM  6 years agoPost 9
Mputu

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Killeen, TX

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Ruddy, have you or are you familiar with 3GX?

I think i will do some research by reading the manual and see if I can respond better to his question...

Fly hard, Land safe

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11-14-2011 10:18 PM  6 years agoPost 10
rudyy

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E. Amherst, NY

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OK My bad. I am thinkg all FBL uses single servo swash setting.

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11-15-2011 12:01 AM  6 years agoPost 11
dkshema

rrMaster

Cedar Rapids, IA

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All the SWASH EXPO feature does in a JR/Spektrum system is to try to account for the non-linearity of the servo output to swash movement as you move the sticks. Since we're converting a rotary output from the servo into what we'd like to be a linear output on the swash input, linearity is lost as the servo wheel moves toward either extreme of movement.

The FBL systems are supposed to not care about stuff like that coming from the transmitter, they do all the translation and control of the servos based on TX input.

As such, I don't believe having SWASH EXPO enabled actually buys you anything in an FBL system.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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11-15-2011 02:19 AM  6 years agoPost 12
wifeorheli

rrElite Veteran

reno, nevada usa

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MAV in my honast opinion theres no need for swash expo unless theres something your trying to achieve there. I sent you a pm

Novarossi Motors U.S.A
www.PLanethobby.com
Team GrandRc.com
Team Byron Fuels
ZRC U.S.A. "PushGlo, SwitchGlo"

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11-15-2011 01:29 PM  6 years agoPost 13
BarracudaHockey

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Jacksonville FL

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As for the curve exp, thats up to you. If you're running a nitro I would enable it on the throttle curves.

As for pitch curve, sure it wont hurt anything but if you're running a 3d (linear) setup in all flight modes, it won't do anything.

Andy
AMA 77227
http://www.jaxrc.com

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