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Newbies: Tips and Information Section of HF, specifically for Passing along info to newcomers to the hobby. Setup, tweaking, orientation practice, etc.


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Old 10-06-2011, 04:43 PM   #1 (permalink)
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Default Throttle HOLD DX8

Can someone explain how to set the throttle HOLD switch on DX8? It is labeled as MIX 0, HOLD 1 on the DX8 and is located in the right upper back position on the TX behind the RUDDER D/R switch.

I have concluded that the HOLD switch is used to disable the ESC so it cannot start the motor, no matter where the collective/pitch stick is positioned. Seems like a great safety factor, even though looks like I can set an alarm on the TX for when the TX is switched to ON with the collective/pitch stick anywhere except bottom position.

Since the ESC control lead plugs into the THRO socket on the AR8000, I conclude that the signal for HOLD must go through the throttle channel to the ESC. Is this correct? (I am trying to not assume anything).

I also conclude that when the MIX/HOLD switch is in position 1 (HOLD), the throttle curve can be set for values above 0, at least for stunt 1 and 2 while safely preventing the motor from starting. Is this correct?

I have RTFM already, and it is simply not clear about this.
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Old 10-06-2011, 05:01 PM   #2 (permalink)
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First, to enable TH, go to F-MODE SETUP and assign the TH switch to TH.

Now: TH does not disable your ESC. What happens when you flip the TH switch is that the transmitter will use the TH throttle and pitch curves for sending THR/PIT signals to the receiver.

The DX-8 allows you to decide which one of 4 SETS OF THR/PIT CURVES will be used in determining what THR/PIT values are being transmitted.
3 of these sets you select by flipping the F-mode switch (Norm, IU1 and IU2)
The 4th set is the TH set and by flipping the TH switch to 1 (on), this set overrides any set choosen with the f-mode switch.

By having a flat 0 throttle curve for TH (set up in the throttle curve menu), the tx will send a 0 (no throttle) for all stick positions. DO NOT alter these all-zero values as that will void any reason to use TH in the first place.
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Old 10-10-2011, 12:19 PM   #3 (permalink)
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Well, that helps and explains a lot. Seems as though manuals would explain this better. The relationship between F-Mode, TH, Throttle Curve/Pitch curve is just not well explained. Not even in 'The Ultimate Guide to Spektrum DX8'.

Bear with me: so if one day I wanted to try to autorotate, would I use TH to stop engine while still having collective via the Pitch Curve? And flipping switch to MIX would enable motor to start in what F-Mode is selected, if I wanted to abort auto?

And now thanks are in order: many thanks, ochen spacibo, molto grazie, merci boucoup, viel danke, etc. (sorry, don't know any Norse).
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Old 10-10-2011, 12:29 PM   #4 (permalink)
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Found it: takk!
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Old 03-28-2013, 01:23 PM   #5 (permalink)
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I'm thinking of buying a dx8. Question: On my dx6i, the flight mode switch is on the top, but the one closest to me. The back one, Trainer, is the farther (and larger) switch. However, what I'd prefer is that the big switch be the idle up, since it's more important, like the TH HOLD switch on right/back is. I can't tell from the documentation ( www.horizonhobby.com/pdf/SPM8800-Manual_EN.pdf ), but can I assign switches like I want? Thanks -- matt


Quote:
Originally Posted by LN400 View Post
The DX-8 allows you to decide which one of 4 SETS OF THR/PIT CURVES will be used in determining what THR/PIT values are being transmitted.
3 of these sets you select by flipping the F-mode switch (Norm, IU1 and IU2)
The 4th set is the TH set and by flipping the TH switch to 1 (on), this set overrides any set choosen with the f-mode switch.
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Old 03-28-2013, 01:30 PM   #6 (permalink)
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According to the manual.

"You can assign the flight mode and hold functions to any of 9 switches including: Inhibit, Aileron D/R, Elevator D/R, Rudder D/R, Gyro switch, Flight Mode Switch, Hold and the Governor switch."
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Old 03-28-2013, 01:49 PM   #7 (permalink)
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Doh! I didn't read carefully enough. Thank you.

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Originally Posted by BustedRaptor77 View Post
According to the manual.

"You can assign the flight mode and hold functions to any of 9 switches including: Inhibit, Aileron D/R, Elevator D/R, Rudder D/R, Gyro switch, Flight Mode Switch, Hold and the Governor switch."
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Old 03-30-2013, 07:42 AM   #8 (permalink)
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You should be able to check out the servo monitor screen on the TX to see what the TX is commanding different channels with switches in different positions.
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Old 07-28-2014, 11:28 AM   #9 (permalink)
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DX8. Someone can explain why the TH alarm is on when TH is on. Safety would'nt be the opposite?
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Old 07-28-2014, 12:05 PM   #10 (permalink)
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Quote:
Originally Posted by jacques gagnon View Post
DX8. Someone can explain why the TH alarm is on when TH is on. Safety would'nt be the opposite?
My guess is that it is a hangover from days when pilots would fly in a normal mode. Also may have something to do with IC (nitro/gasser helis) where hold is idle, and cut is off.

I just disable that warning.
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Old 07-29-2014, 12:50 AM   #11 (permalink)
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Quote:
Seems like a great safety factor, even though looks like I can set an alarm on the TX for when the TX is switched to ON with the collective/pitch stick anywhere except bottom position.
It is an important safety factor for both handling and flying. You will want to be able to flip the TH without thinking about where it is positioned on the transmitter. If you are sure you are going to crash, you want to hit the TH to prevent crashing with power engaged.

Also TH and cut off are two separate functions for a nitro.
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