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HelicopterRadio - Spektrum DSM › DX7 & throttle hold issues
09-11-2007 01:40 PM  10 years agoPost 1
Chugga-bug

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London UK

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Has anybody had an issue with THR hold not working in idle 1/2??
Happened to me on Sunday.
I was flying my Knight for the first time, just hovering about running in a new engine, and found that on a couple of occasions the throttle hold didn't work! Gave me a bit of a shock for a moment but when I switched back to Norm mode it worked fine. Happened a few times but not all the time
I can't recreate the problem on the bench so I'm wondering if it's got something to do with the CSM RL20 I'm using??
Any ideas please??

"Up in smoke... that's where my money goes.."

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09-11-2007 03:17 PM  10 years agoPost 2
BarracudaHockey

rrMaster

Jacksonville FL

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Throttle hold should over ride all flight modes. Make sure its low enough so the RL20 senses that its below 25 percent throttle in hold.

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

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09-11-2007 03:56 PM  10 years agoPost 3
bulldogs

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~OC~ ,CA USA

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Yes your GOV is not set up right..Had the same problem with my GOV 1 ..

~TEAM OCHC~
A strong man stands up for himself a STRONGER man will stand up for others.

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09-11-2007 09:01 PM  10 years agoPost 4
Chugga-bug

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London UK

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Problem solved
With the help of the guys on Heliaddicts.co.uk.
I had my low throttle ATV too low(82%. Should have been at least 85%). That combined with the T/Hold position meant that with T/hold it wasn't going below 25% throttle, so the Revlock wasn't disengaging. (something like that anyhow! ).

Imanaged to recreate the situation on the bench so I'm sure it'll be fine next time I fly.

"Up in smoke... that's where my money goes.."

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10-02-2007 03:16 PM  9 years agoPost 5
kcass518

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Manhasset, NY - USA

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I have the same problem and still can't figure it out.

I see on the screen that shows bar graphs of the positions of all the servos, that when I'm in Idle Up 2 and hit the throttle hold, AUX 2 drops to the Idle Up 1 position. When in Idle Up 1 and hit the throttle hold, there is no change - throttle hold in Idle up 1 and 2 gives me a governed headspeed of Idle Up 1. Only in NORMAL does AUX 2 drop to 50% to disable the governor. If I flip down the AUX 2 switch, it disables the governor in all flight modes and everything is fine. But, of course, I would prefer to only have to flip One switch when I need to AutoRotate. Any quick suggestions? Or do you need more info? I use the TJPro and activate it by setting up the PMix's with AUX 2 -> AUX 2, etc. I've tried changing my curves and end points, but no luck. I need Throttle Hold to disable my governor. BTW, my low ATV is at 94%. I have my throttle subtrim at L 33, but even when I zeroed that it didn't make a difference.

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10-02-2007 03:30 PM  9 years agoPost 6
jaxrotor

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Jacksonville FL

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In the menu set the AUX2 to F.MOD

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10-02-2007 04:22 PM  9 years agoPost 7
kcass518

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Manhasset, NY - USA

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If I only do that, the AUX 2 on the screen stays at 50% which tells me the governor is totally disabled.

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10-03-2007 05:11 PM  9 years agoPost 8
kcass518

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Manhasset, NY - USA

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Okay, I've done as much research as I know how to do, and the solution I've come up with is to associate my Throttle Hold to the AUX 2 switch so that now I'll flip the AUX 2 switch to go into Throttle Hold and disable the Governor both at once. I should move my Throttle Hold on the TRex 450 to the same switch so I don't get confused. If or when I get a more complex 2.4 ghz radio I'll be able to get back to normal.

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10-04-2007 12:00 AM  9 years agoPost 9
Chugga-bug

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London UK

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Ok. What you need to do is set AUX 2 to F.MOD

Then use AUX subtrim to set IDLE 1 speed,

flip switch to normal mode and set AUX ATV till you get the bar in the graph centred.

Then switch to IDLE 2 and use AUX ATV to set speed.

You may need to go back and check for centre in the graph and adjust ATV to reset it.

My settings on my knight 3D are:-
AUX 2 subtrim @ -86
AUX 2 ATV NORMAL MODE +53
AUX 2 ATV IDLE 2 -38

This gives me,
Gov Disabled in NORMAL
1850 rpm in IDLE 1
2100 rpm in IDLE 2

Only downside to this setup is that both idles are in Revlock mode 'A'. So if I wanted to set mode 'B' as a limiter, I can't.
Would have to think of another way.

"Up in smoke... that's where my money goes.."

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10-04-2007 01:00 AM  9 years agoPost 10
capman231

rrApprentice

Leicester, NC - USA

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DX7 & RL20

Hi Chugga-bug,

See if this helps...

http://www.runryder.com/helicopter/t307704p1/

capman231

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10-04-2007 03:08 PM  9 years agoPost 11
kcass518

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Manhasset, NY - USA

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Thank you, Chugga, but (just looking at my servo graph) I don't think that solves my problem. With a Revlock, that would be another way to limit your headspeeds for Idle Up 1 & 2. And, maybe with the Revlock you don't need to disable it in Throttle Hold because it doesn't control the headspeed. But with the TJPro, your mod does not disable the governor's control when switching on the Throttle Hold while in Idle Up 1 or 2. I use the three PMIXs and AUX2 to control my headspeed which I think must work just as well as FMOD, but for some strange reason when I'm in Idle Up 2 and click on Throttle Hold, my headspeed decreases to the Idle Up 1 value - it doesn't drop to idle as it should in Throttle Hold. Any other suggestions?

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10-04-2007 08:47 PM  9 years agoPost 12
AAKEE

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Boden, Sweden

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Kcass518---> IU use the Dx7 and its 3 mixing programs to get my RL20 to give different head speeds between Idle1 and 2.

My Trottle Hold works perfect, but its important to do the setup correct...the RL20 wont disengage if the throttle position is more then 15% (and this is the % of the travel learned by the RL20 when its set up.)
If you put to high throttle hold, then the RL20 will stay governed.

But You can se that it wont go to idle in the Tx meny showing the travel ? Did you do any mixing that involves the throttle or throttle hold?

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10-04-2007 09:34 PM  9 years agoPost 13
kcass518

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Manhasset, NY - USA

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Thank you, Aakee,

Here's what I've got: PMIX1 Rate +15% SW:F-S2
PMIX2 Rate +48% SW:F-S12
PMIX3 Rate -100% SW:On

Throttle SubTrim is at L 33

Travel Adjust - Throttle is at H 100%, L 94% - AUX2 is at +100%,-0%

Throttle Hold Pos is at 18% (I'm learning autos), but it does the same thing when I reduce it to 0.

Throttle curve is NOR - 10,25,35,45,85
Idle Up 1 - 85,45,35,45,85
Idle Up 2 - 85,45,35,45,85

On my Servo Screen, there is a center mark, and 50% and 100% to either side of center. With the Throttle Hold switch off, or towards the back of the transmitter, the AUX 2 servo is at center in Normal, +50% in Idle Up 1 and +60% in Idle Up 2. When I flip the Throttle Hold switch ON, AUX 2 is at center in Normal, +50% in Idle Up 1 & 2. I just put my Throttle Hold Pos to -20%, and there is no change in the servo screen. My only thought is that with the RevLok, your throttle is not governed - it is just kept from maxing out. With the TJPro, it holds the headspeed until its conditions are not met. I'm going to read some more on it tonight, but I think it's a transmitter problem, not a governor problem.

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10-04-2007 10:13 PM  9 years agoPost 14
AAKEE

rrApprentice

Boden, Sweden

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Hi again,

Revlock = yes its a governor(its possible to run it as a revmax also, but I run it in governor mode). I set the headspeed in the Tx, thats wy I use the three mixing programs, to get different speeds with the flight mode switch.

1) In my Dx7 I have the same screen and it goes to 0% regardless of the position of the FM switch.

2) I used the mixes to make the aux2 channel change value when switching the flight mode from normal to idle1 and idle 2, thats easy to se in the servo screen. I need to have that channel at about 50% in normal to have the revlock disengaged, and then different values in fm1 and fm2 to get the desired head speed.

The 1) and 2) above make me beleive that it could be something you did in your mixing programming...but i dont know.

For sure: if the marker wont go to the position for the throttle hold value when you hit throttle hold, then its not a gov problem.

The throttle hold works fine if in flight mode 'normal ?

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10-05-2007 02:23 PM  9 years agoPost 15
kcass518

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Manhasset, NY - USA

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Yup, it works fine in NORMAL. I think it's odd that it reverts to the IU1 value when switching on TH in IU2. I'll keep reading!

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10-05-2007 07:10 PM  9 years agoPost 16
kcass518

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Manhasset, NY - USA

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Okay, I think I fixed it. Howse this for bizarre?

I had my IU2 headspeed controlled by PMIX 1, and IU1 headspeed controlled by PMIX 2. PMIX 3 sets NORMAL to where the governor is disabled (50%). So, I moved my settings from PMIX 3 to PMIX 2, and PMIX 2 to PMIX 3, so that now PMIX 3 controls IU1, and viola - no more issues! I go to the servo screen and flip the switches and no more governor control when Throttle Hold is on regardless of where the Idle Up switch is switched to.

Hope that's clear. PMIX 2 has more options than the other PMIX's as far as switch selection goes. I don't know why that impacts the throttle hold function, but I noticed that PMIX 1 would behave properly when hitting throttle hold, and PMIX 2 wouldn't. Noticing the choices for switch selection in the various PMIX's, I thought it would be worth trying this out. I'll check it out the next time I fly to be sure, but it looks right to me now.

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HelicopterRadio - Spektrum DSM › DX7 & throttle hold issues
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