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HomeRC & PowerAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › Smooth (ie, Brief TH Servo Delay) Spoolup when Bailing Out of an Auto
07-10-2013 03:06 AM  5 years agoPost 1
flustercluck

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Newnan Ga (Just S. of ATL)

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Fellas, question: I have a DX8/ 600N. If/When bailing out of an auto (particularly in ST1 or 2), is there a way to get a smooth/slightly delayed throttle servo command?

Ie, instead of the DX8 commanding the servo to immediately go to whatever the collective stick setting is, have it come up a bit slower so as to minimize jerkiness?

I'm fairly sure this can be done on an electric ship via the ESC's 'soft start' programming...meaning, even if the left stick is full throttle, the ESC won't let the motor immediately go there

Just wondering whether is can be done on a nitro ship via the Tx

thx
Jeff

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07-10-2013 03:33 AM  5 years agoPost 2
rc3po

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Danville, Illinois

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I know the DX8 has servo delay settings in the servo menu. You can experiment with adding delay and slowing down the servo for a smoother spool up. See if that would work for you. Digital servos are getting fast and can create some havoc on bailouts and such.

Happay Happay Happay...

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07-10-2013 12:52 PM  5 years agoPost 3
Puffy929

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N W Ohio

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There should be a delay in the hold menu. I have mine set at 5 seconds I believe. Works great!

TRex600Nitro YS 50 JR9303Converted to 2.4 TJ Pro

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07-12-2013 02:00 AM  5 years agoPost 4
flustercluck

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Newnan Ga (Just S. of ATL)

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Puffy does the DX8 have a hold menu? You flying elec or nitro?

In my DX8, under >servo setup>speed> I can retard the individual servo response for: TH, AIL, ELE, RUD, GYR, PIT, AUX2, AUX3...obviously, delaying the speed for TH would be a bad idea.

But I see no "hold" menu in this tx. I was flying tonite, shooting auto's, and when I practiced bailouts by flipping out of hold, the motor immediately jumps up from idel to flight rpm...that's a heckuva jump in like .25sec

Anybody know a way to slow that flipping-out-of-hold transition?

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07-15-2013 05:55 PM  5 years agoPost 5
flustercluck

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Newnan Ga (Just S. of ATL)

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Guess not, for the DX8?

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07-15-2013 06:00 PM  5 years agoPost 6
JKos

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Redondo Beach, CA

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Did you try the servo delay? Are you using throttle curves or a governor?

- John

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07-15-2013 09:10 PM  5 years agoPost 7
flustercluck

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Im using a Multigov...and remember this is nitro, not electric

See my relpy above to Puffy re servo delay

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07-15-2013 09:33 PM  5 years agoPost 8
JKos

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Redondo Beach, CA

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> obviously, delaying the speed for TH would be a bad idea

Why, exactly? It may take very little delay to help. Since you are using a governor your actual throttle channel doesn't need to be super fast.

What servo are you using for throttle?

> remember this is nitro, not electric

Yes, I got that.

You could also try adjusting the "Startup Speed" parameter of the Multigov, although that won't fix any initial jolt since it doesn't take over until the rotor speed is at 70% of target speed.

A slight delay plus playing with the "Startup Speed" might help.

- John

RR rules!

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07-16-2013 12:16 AM  5 years agoPost 9
Puffy929

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N W Ohio

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Nitro and Not sure on the DX8. I fly a 9303. sorry I did not get back sooner as I have been busy at work. You can try and use a mix that is activated with the throttle hold switch. Just trying to think while I type.

TRex600Nitro YS 50 JR9303Converted to 2.4 TJ Pro

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07-16-2013 01:38 AM  5 years agoPost 10
flustercluck

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Newnan Ga (Just S. of ATL)

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JKos I thinks that's it
You could also try adjusting the "Startup Speed" parameter of the Multigov, although that won't fix any initial jolt since it doesn't take over until the rotor speed is at 70% of target speed.
Great idea- that setting is in "advanced" and it's set to default 10 (out of 1-50). The manual says lower value decreases startup speed coming out of TH hold. So I'm gonna try 5 and see what that does.

Bear in mind also, when I'll be hitting TH hold, it'll be in ST2 (if I told ya why I'd take a lotta ribbing)

Here's the other thing the manual says, not sure I understand: "Startup period expires approx. 5 sec after being active"

I take that to mean, I have only 5 sec in TH hold for the 'soft start' to be active....any longer, the 'startup speed' param disengages and I'd be back to the 'hot start' when coming off TH hold

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07-16-2013 05:00 AM  5 years agoPost 11
JKos

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Redondo Beach, CA

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I saw the 5 second statement as well; but I don't know how to read it (like you said, when does the 5 seconds start). Based on the Function column saying, "startup speed when transitioning from governor being disabled to active," I would guess it means from the time the governor becomes active (70% of target speed). But, that's a guess.

- John

RR rules!

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07-26-2013 03:43 PM  5 years agoPost 12
flustercluck

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Newnan Ga (Just S. of ATL)

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I saw the 5 second statement as well; but I don't know how to read it (like you said, when does the 5 seconds start). Based on the Function column saying, "startup speed when transitioning from governor being disabled to active," I would guess it means from the time the governor becomes active (70% of target speed). But, that's a guess.
Update

Well in the multigov 'advanced config' menu I lowered the default value from 10 to 5 (manual says lower # should be softer startup)...but after a cple flts I see no change- meaning, when I hit TH hold, and back again, the engine spools up immediately, with the customary tail twitch (due, I assume, to the quick application of a lot of torque)

**Sigh**

Anything I might have missed? I see no way to delay restart on the DX8

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