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HomeAircraftHelicopterHelicopter Main Discussion › d/r and expo question
02-06-2016 02:01 AM  33 months agoPost 1
tjk1812

rrNovice

sunbury, ohio - USA

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I'm in the process of restoring an older Huey cobra with gmp mechanics. I'm keeping the flybar setup for now but wanted to use my spectrum transmitter. Has anyone ever programmed a transmitter, changing the d/r and expo on a flybarred heli? Or is it better to program only for flybarless helis? Any ideas? Thanks.

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02-06-2016 02:13 AM  33 months agoPost 2
wc_wickedclown (RIP)

rrProfessor

long beach calif

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flybarred heli i use 15+ expo

Insha Allah made in america

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02-06-2016 02:18 AM  33 months agoPost 3
rcflyerheli

rrKey Veteran

Granbury, TX USA

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Since with FBL, the individual software of the controller will determine the agility and the expo from within the controller, you use the controller's setup program to input that on the heli, not on the TX.

Since (with the exception of the tail gyro on a FB heli) everything is mechanical and aerodynamic, you set the heli up with the maximum throws that are recommended by the mfg, then to tone them down, you input as necessary the lower rates and expo in the transmitter.

Even with the tail gyro, you can still input expo, but I'm thinking the dual rates should be left at 100 for the gyro to effectively work.

Logo 700, Specter 700, Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
Amain Team Rep

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02-06-2016 02:26 AM  33 months agoPost 4
cudaboy_71

rrElite Veteran

sacramento, ca, u.s.

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I'm not sure I understand the nature of the question. D/Rs and Expo predate FBL. Of course it can be done. It *should* be done. That's how you set up the heli.

Are you worried about not knowing how to do it correctly? If so, there's plenty of guys here who flew pre-flybarless that could help you out.

if it ain't broke, break it.

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02-06-2016 06:59 AM  33 months agoPost 5
Heli Fanatix

rrVeteran

Fountain Valley, CA

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Assuming if I'm understand you correctly, you want to:
- use your Heli as a Flybar with your Spektrum TX

Than, In your Spektrum TX
- under servo > use mixing for your specific swashplate degree / mixing
- than go through your usual Flybar setup

IMHO
Expo
- Use 10~15 to reduce interactions between your sticks
- anymore, the movements won't be linear
- this promotes and enable smooth, precise tx stick inputs

D/R
- would be used to limit your travel
- control your roll, flip, rudder rate
- same as you would for agility on FBL setup

All TX back in the day pre-dating FBL was setup that way. The newer TX is added 1 Servo (instead of 120 degree mixing, etc). Don't forever to use Revo-mix.

Just use what you got that your are comfortable with till you get use to the FBL scene.

FYI
- some FBL Unit (e.g. 3GX) require mechanical mixing like FB but compensates like a FBL. It call it a hybrid of the FB and FBL

Hope this

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02-06-2016 08:44 PM  33 months agoPost 6
tjk1812

rrNovice

sunbury, ohio - USA

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Thx for info to all...I just wasn't sure if it was worth using d/r and expo on a flybarred helicopter or if it isn't recommended.

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02-06-2016 10:22 PM  33 months agoPost 7
flycatch

rrApprentice

Barstow, California

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This is just my opinion since I do fly FB helicopter using finger and thumb technique. I have never used dual rates or expediential since I don't feel it necessary. Now if you fly thumbs then I believe it might be necessary. I fly with a fellow who is a thumb flyer and he uses both dual rates and expediential. Bottom line is use what makes you confortable to complete the task.

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02-07-2016 04:19 PM  33 months agoPost 8
pH7

rrKey Veteran

Sterling Heights, MI - USA

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Just a different viewpoint from someone who started in the hobby before flybarless was available - We always set up helis with the maximum pitch an control that was allowed by the mechanics, then dialed it back using D/R as appropriate for the flyer, anyone from beginner to expert. Both D/R and Expo are a personal preference, depending on what feel right to you.

Phil Heavin

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02-07-2016 09:01 PM  33 months agoPost 9
newbheliusr

rrApprentice

You guesss

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Both D/R and Expo are a personal preference, depending on what feel right to you.
This is sooo true. So many things in this hobby are a personal preference.

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02-08-2016 03:11 PM  33 months agoPost 10
Richardmid1

rrProfessor

Leeds, England

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It also depends on what your flying style is aswell as head speed, blade weight, etc etc.

Personally I fly on the deck 3D and like maximum cyclic authority so it is almost necessary to use expo for me! I like 20-25%. I only use D/R to adjust piro rate for rudder as I always set max cyclic pitch on a flybarred heli during setup and if I feel I need to reduce cyclic pitch I do it in the swash mix menu for AIL and ELE.

It's a bit like flying a 3D plane with lots of throw on the surfaces, you NEED lots of expo or they are very hard to fly.

60% of the time, it works every time!

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02-08-2016 04:09 PM  33 months agoPost 11
Heli_Splatter

rrElite Veteran

USA

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WIth this OP's question, I would suggest seeking out help from an experienced helicopter pilot/builder.

There are some fundamental issues here that you need help with.

Best of luck.

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02-09-2016 06:26 PM  33 months agoPost 12
Calil

rrApprentice

Brazil

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On FBL the expo curve should not be setted? Only in the software to smooth the movement on a scale model for example?

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02-09-2016 06:55 PM  33 months agoPost 13
cudaboy_71

rrElite Veteran

sacramento, ca, u.s.

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Depends on the unit. Vbar for example, expo is set in the vbar application only. Never in the tx. I believe Align unit is set in the tx though.

if it ain't broke, break it.

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02-09-2016 07:40 PM  33 months agoPost 14
Calil

rrApprentice

Brazil

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I use ikon. I ll look for information. There is a parameter where higher the value (agility) smoother the heli.

But i was using both. Ill leave the expo on tx alone then

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