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Spektrum DX6i Throttle issues

Throttle control not allow Zero

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Carlos Contreras21/01/2020 12:53:42
7 forum posts

Hi guys... got a second hand DX6i and it seems not function correctly... the throttle doesn achieve 0%, not even if I trim it, and the rotor seems to have power all the time (I disconnect the motor) as you can see on the video... any ideas? is it defective ? I'm doing something wrong? please have a look

**LINK**

Thanks a lot

john stones 121/01/2020 18:14:58
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10821 forum posts
1482 photos

I don't use Spektrum Carlos, anyone else got ideas ?

Denis Watkins21/01/2020 18:35:34
4048 forum posts
75 photos

Confirm the travel in the " Monitor " window Carlos

Then check the sub trim setting is back to Zero

And

The Travel adjust setting is 0% to 100%

These are 3 separate Windows in the menu

Carlos Contreras21/01/2020 18:47:08
7 forum posts

Thanks a lot I will check it tonight !!!!... I was reading about cleaning the potentiometer, some people called it "throttle glitch"... let's see... Really appreciate your response.

kc21/01/2020 19:39:47
6202 forum posts
169 photos

One other possible problem with a 2nd hand set might be that it's set to Mode 1 rather than Mode 2 even thought he rachet seems correct for Mode 2. Swapping mode 1 to 2 also has to be done in the programming menu. So just wiggling the right stick and trim might give a clue ....

Frank Skilbeck21/01/2020 22:34:22
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4568 forum posts
101 photos

Just a thought, go into another model memory and set it to Airplane model, set the throttle travel to +/- 100% with the trim down and check the movement on the servo monitor, if the throttle moves over it's full range then the stick is OK and it is something in the Heli programming.

john stones 121/01/2020 23:50:56
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10821 forum posts
1482 photos

Heli mode ? idle up.

Carlos Contreras25/01/2020 12:04:13
7 forum posts

Hi guys thanks for the replies... after reading/watching a few videos I decide to clean the potentiometer.. so open the transmitter, the potentiometer (3 metal flaps holders) clean the inside with Isopropanol (looks clean anyway)... put all back and voila !!! its going to 0% and no problem... just tested the heli and all ok in that part.

Now... second question... fortunately I test the heli without rotors (safety first). All ok.. back to 0% throttle stop... but I turn the transmitter OFF and the motor started like in full swing !!!... is that "normal"? should I disconnect the heli power first? (sorry if sound a basic question... but my RC car don't do that... Traxxas) Thanks !!!

Gary Manuel25/01/2020 12:15:47
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2049 forum posts
1515 photos

Carlos. wrt to 2nd question. It sounds like your fail-safe is set up with the throttle at 100% rather than 0%.

Have a read up on setting the fail-safe.

edit - If using spektrum receivers, it probably just means re-binding with throttle down. Let me guess that you have reversed your throttle servo in your transmitter since you initially bound the model.

Edited By Gary Manuel on 25/01/2020 12:18:27

Carlos Contreras25/01/2020 12:19:49
7 forum posts

Cheers Gary !!! I will dig into these days. Thanks a lot.

Colin Carpenter25/01/2020 12:23:51
600 forum posts
35 photos

Always disconnect Rx/model before turning off tx ! Otherwise ☠️☠️😂😂Colin

Gary Manuel25/01/2020 12:34:50
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2049 forum posts
1515 photos
Posted by Colin Carpenter on 25/01/2020 12:23:51:

Always disconnect Rx/model before turning off tx ! Otherwise ☠️☠️😂😂Colin

I disagree. In fact, it's a mandatory safety test at our field - to test that the fail-safe is set right.

Obviously hold onto your model whilst doing it - just in case fail-safe is wrong way round!

Peter Christy25/01/2020 13:05:20
1666 forum posts
Posted by Gary Manuel on 25/01/2020 12:34:50:
Posted by Colin Carpenter on 25/01/2020 12:23:51:

Always disconnect Rx/model before turning off tx ! Otherwise ☠️☠️😂😂Colin

I disagree. In fact, it's a mandatory safety test at our field - to test that the fail-safe is set right.

Obviously hold onto your model whilst doing it - just in case fail-safe is wrong way round!

Yeah, but the OP appears to be flying a helicopter! Your club's "safety test" is a recipe for disaster in that scenario!!!

--

Pete

Gary Manuel25/01/2020 13:46:59
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2049 forum posts
1515 photos

Good point Peter. I don't fly helicopters so I'm not sure how faisafe should be set.

I'm pretty sure that it should not be set to throttle up with the copter sat on the ground though. Whatever the intended failsafe is, it should always be tested and not just assumed that it will behave as expected.

Oh and to clarify my previous post. I meant that I disagreed with the "Otherwise ☠️☠️😂😂" part, not the order that the Tx and Rx should normally be switched on and off. Apologies if what I said was misleading. I do maintain that switching the Tx off (or losing the signal!) with the Rx switched on should result in a safe situation and must be specifically set up and tested. That's what I was getting at.

Edited By Gary Manuel on 25/01/2020 13:48:53

Gary Manuel25/01/2020 13:47:45
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2049 forum posts
1515 photos

 double post

 

Edited By Gary Manuel on 25/01/2020 13:48:16

Carlos Contreras26/01/2020 14:12:56
7 forum posts

Yup Gary... thanks again... it was that... now the fail-safe is set to 0%.... I'm still wondering what would be the safest option for it... ok 100% its a no no... basically its a recipe for disaster.... and a 0% it will depend of how high it is... and my guts says about enough throttle to make it land... BUT... incontrolable with the rotor spinning?... is not safe for anyone... I will prefer a crash with to rotor OFF... what do you think?

Colin Carpenter26/01/2020 15:09:47
600 forum posts
35 photos

My experience with helicopters is to set zero. When they go they go so less rpm at the head the better ! JMO ! I've only ever seen one fly away back in the 80's ! A Bell 47 MASH flew from our field in Bath to an outskirt village about 3 miles away ! Pre failsafe of course ! I was in the local model shop when a chap came in and asked what a MASH ,Heli was worth ! Owner got it back in a repairable condition ! Colin

Gary Manuel26/01/2020 16:05:13
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2049 forum posts
1515 photos

Carlos.

I don't fly helis but I do fly quads. I set my failsafe on my quads to cut the motors immediately. My thoughts are that a quad falling from the sky can only impact once and it will be directly below where I was flying - which should be over an empty field and therefore safe.

kc26/01/2020 16:06:22
6202 forum posts
169 photos

It's worth reading what the BMFA say about the law regarding failsafes.

john stones 126/01/2020 18:50:43
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10821 forum posts
1482 photos
Posted by Gary Manuel on 25/01/2020 12:34:50:
Posted by Colin Carpenter on 25/01/2020 12:23:51:

Always disconnect Rx/model before turning off tx ! Otherwise ☠️☠️😂😂Colin

I disagree. In fact, it's a mandatory safety test at our field - to test that the fail-safe is set right.

Obviously hold onto your model whilst doing it - just in case fail-safe is wrong way round!

Nope our club doesn't have a mandatory test for helis, you stick to drones n planes. face 1

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