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HelicopterRadio - Servo - Gyro - Gov - Batt › FUTABA END POINTS QUESTION
12-04-2005 02:55 PM  12 years agoPost 1
jpalmer

rrApprentice

Meadville, PA

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I just noticed this. With 7CHP and S9402 servos, on collective pitch channel 6, the servo will not move after reaching 110% on the End Point adjustment. In other words, if I hold the stick full either direction and start increasing the E. Point, when the E. Point hits 110% the servo will not move any further. If I go ahead and set the E. Point to its max. (140%), then the servo will not move until the stick has come off its full limit of travel about 5 degrees.

I bought a new servo, thinking that was the problem, but it does the same thing. The other channels do not exhibit this. In other words, the servo keeps turning all the way to 140%.

Your thoughts? Thanks, Joe....

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12-04-2005 05:49 PM  12 years agoPost 2
BarracudaHockey

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Jacksonville FL

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Interesting. That is the second time I've heard the same thing, but last time it was a 9C

If JaxRotor doesn't post an answer throw him a PM.

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

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12-04-2005 11:58 PM  12 years agoPost 3
Mitchell Kahn

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Los Angeles CA

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Make sure your pitch curve is set to 0,25,50,75,100 initially, then set the travel to where you want, then go back and set the pitch curve.
If this doesn't fix it, double check any sub-trim on ch. 6.
Mitch

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12-05-2005 12:02 AM  12 years agoPost 4
ScareCrow_Delta

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Sebastian, FL

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The problem is your subtrim (not really a problem). The servo can only travel so many degrees electronically. If you have subtrims, this offsets the servo travel on the opposite side of the subtrim. I bet, if you put your subtrim to 0, you will have the same travel on both sides.

~~~~ Defy the laws of gravity....gracefully ~~~~

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12-05-2005 01:48 AM  12 years agoPost 5
jpalmer

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Meadville, PA

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Okay, I went back and checked. Pitch curve is 0, 25, 50, 75, 100. Sub-trim is 0. Just so I am clear, it is not a matter of the servo turning more one way than the other, if I put the stick to full deflection (either way) and dial in E. Point, the servo will continue to move only to 110%. In other words, there is no movement from 110% to 140% (either way).

As I mentioned, I can get the other servos (channels) to move all the way to 140%. What else may I have set wrong? Thanks again, Joe...

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12-05-2005 02:02 AM  12 years agoPost 6
ScareCrow_Delta

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Sebastian, FL

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Make sure you don't have travel limits on the mixing ( i.e some radios has a limiter so that if you add a mix on something, it will not bind). It is difinitely a signal issue (radio software). Try to put your subtrim a few clicks to the opposite side of the travel that has the problem. If the problem still stays at 110%, then you might have a problem on the midstick signal to the rx. Your potentiometer on the pitch needs calibration. If the problem goes away or the travel limit is different, then the midstick signal for that channel is simply off from 1520mS. But this is rare, try to find out everything you can on the radio and mixing and pitch curves. The TX may simply be transmitting what it is told.

~~~~ Defy the laws of gravity....gracefully ~~~~

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12-05-2005 03:01 PM  12 years agoPost 7
jpalmer

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Meadville, PA

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Thanks for the responses. I am still trying to figure it out. All mix's appear to be inhibited in both the normal and advance menus. I think I need to clarify the issue. The problem is NOT that the servo moves more in one direction than the other, it moves exactly the same from center in both directions.

The problem is that the servo will not move in either direction (that is with the stick either full up or down) beyond 110% E. Point. (From 110% to 140% adjustment in E. Point the servo does not move.)

Also may be of some help, if I set the E. Point to 140%, then the servo will not move until the stick has come off its full travel position approximately 5 degrees. In other words, if I want the servo to start moving as soon as the stick comes off its full travel position (either full up or down) I must set that E. Point to no more that 110%.

Any further thoughts would be appreciated. Joe......

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12-05-2005 03:04 PM  12 years agoPost 8
Dr Lodge

rrElite Veteran

Guildford, Surrey - UK

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I think that's the way its designed...I know the pitch/throttle stick doesn't physically move as far as the others, I'm fairly sure I can set the max ATVs only to 110% before nothing more happens at the end points

Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
TRex 500, Furion, Gaui EP200

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12-05-2005 03:18 PM  12 years agoPost 9
jpalmer

rrApprentice

Meadville, PA

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Dr. Lodge, maybe thats the answer. I do note the throttle servo will move all the way to 140%, but maybe there is a limit of 110% on the collective pitch. I just re-read the manual and it says nothing about a limit on one channel (but that would not surprise me). Thanks.....

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12-05-2005 03:21 PM  12 years agoPost 10
Dr Lodge

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Guildford, Surrey - UK

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do note the throttle servo will move all the way to 140%, but maybe there is a limit of 110% on the collective pitch
Yes, that sounds familiar - just the pitch throw that's limited. Don't know why.

Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
TRex 500, Furion, Gaui EP200

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12-05-2005 03:47 PM  12 years agoPost 11
Dr Lodge

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Guildford, Surrey - UK

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jpalmer

I have an email from gr8 planes confirming this, I raised to them it ages back since the ATV restriction on channel 6 applies even for CCPM setups.

Will forward to you...

David

Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
TRex 500, Furion, Gaui EP200

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12-05-2005 04:12 PM  12 years agoPost 12
jaxrotor

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Jacksonville FL

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sent you a pm

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HelicopterRadio - Servo - Gyro - Gov - Batt › FUTABA END POINTS QUESTION
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