[NSRCA-discussion] [SA] Help: Elevator Setup on JR10X

[george w. kennie]

David,
Another thing you might want to consider is the orientation of the servo arm 
positionally as installed on the two individual servos. The output spline on 
the servo shaft has an odd number of teeth, making it possible for you to 
reposition it to an position where the amount of sub-trim you have to employ 
is minimized.Example:if you were using a futaba 4-leg output arm, you will 
notice that they are numbered one to four. If you keep taking the arm off 
and reinstalling it in a different position you will find that there is a 
position that will give you almost perfect centering. In your situation if 
you were using the output arm identified as number one on one elevator half 
you would have to use an arm numbered (x, maybe number one)whatever will 
give you the same degree of centering so that the sub-trim values will be 
close to the same. I think the sub-trim values may be the culprit and not 
necessarily the ATV. If you move the pushrod further out on the output arm 
the discrepancy will be amplified and I would rather see you preserve your 
resolution.
I know that I've been using Futaba as an example here, but I just counted 
the teeth on a JR arm and the count is 23 as opposed to Futaba which is 
29(as I recall), so I feel sure that the same principle is involved.
Hope this helps, but then again, I could be all wet.
Georgie


----- Original Message ----- 
From: "Dave Michael" <davidmichael1 at comcast.net>
To: <mini-iac at yahoogroups.com>; "'NSRCA Mailing List'" 
<nsrca-discussion at lists.nsrca.org>
Sent: Friday, June 02, 2006 7:41 AM
Subject: Re: [NSRCA-discussion] [SA] Help: Elevator Setup on JR10X


> The suggestion that I am getting most often is that the issue stems from
> using ATV/End-Point in excess of 100% and sub-trims, both of which I am
> using.  I can't eliminate sub trim as I need to adjust center so that both
> arms are 90 deg to the hinge line- however, the ATV/End-Point can be
> eliminated by moving the control rod attachment point further out on the
> servo arm.
>
> I was trying to set the plane up without 3D throws- to get the best 
> possible
> mechanical advantage- so I am using the servo arm hole closest to the 
> servo.
> I'll change the ATV to 100 or less and move out on the servo arm and see
> what happens.
>
> Dave
>
>
> ----- Original Message ----- 
> From: "Michael Glavin" <mglavin at surewest.net>
> To: "'Dan Knippen'" <dknippen at sbcglobal.net>; "'Dave Michael'"
> <DavidMichael1 at comcast.net>; <mini-iac at yahoogroups.com>; "'NSRCA Mailing
> List'" <nsrca-discussion at lists.nsrca.org>
> Sent: Friday, June 02, 2006 2:18 AM
> Subject: RE: [SA] Help: Elevator Setup on JR10X
>
>
>> Dave
>>
>> A curve is not available to the best of my knowledge.
>>
>> Look very closely at the mechanical setup. I suspect as other that
>> something
>> is amiss here.
>>
>> Are your ATV/End-point settings the same on both channels?
>>
>> Is Sub-trim in play?
>>
>> Any time you introduce an offset such as sub-trim or an unequal end-point
>> percentage you'll realize some variables in performance as compared to
>> another channel without same. Careful mechanical set-up eliminates most 
>> of
>> these problems.
>>
>> Michael Glavin
>>
>>
>> -----Original Message-----
>> From: mini-iac at yahoogroups.com [mailto:mini-iac at yahoogroups.com] On 
>> Behalf
>> Of Dan Knippen
>> Sent: Thursday, June 01, 2006 5:43 PM
>> To: Dave Michael; mini-iac at yahoogroups.com; NSRCA Mailing List
>> Subject: Re: [SA] Help: Elevator Setup on JR10X
>>
>> Dave,
>>    I will probably doing the same thing on my next plane, but I didn't
>> anticipate that problem. Yiks ! Sounds like one arm on one of the
>> elevators
>> is different than the other mounted in the stab?  I'm thinking servo 
>> speed
>> but everything seems fine on down Ele. ? Push rod lengths equal ? Good
>> question?... Let us know what happens.
>>                                    Dan k
>>
>> Dave Michael <DavidMichael1 at comcast.net> wrote:
>>  All,
>>
>> I am setting up a new plane using the wing type mix (22) for an elevator
>> servo on each half, plugging into the elevator and AUX3 ports as
>> instructed.
>>
>> Using the stick on each of the elevators coming together at a single 
>> point
>> behind the rudder to check tracking. I am finding that the elevators are
>> aligned at center and at full up and down elevator.
>>
>> I am also finding that the elevator on AUX 3 starts earlier and reaches
>> full
>>
>> throw earlier than the other elevator and thus tracks with greater throw
>> on
>> that half than on the other half anywhere between neutral and full throw.
>> This is happening with up elevator only- not down elevator.
>>
>> I am hoping I can set up some sort of curve one one half or the other so
>> that I can match the two elevators perfectly (well, as perfectly as
>> possible). Has anyone done this and what are the steps?
>>
>> Thanks,
>>
>> Dave Michael
>>
>>
>>
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