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Elevator Trim Indication

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jchang10

Joined: 05 Jul 2006
Posts: 227

Posted: Wed Sep 14, 2011 9:20 am Post subject: Elevator Trim Indication

http://dynonavionics.com/cgi-bin/yabb2/YaBB.pl?num=1315888107/0



I was playing with calibrating my elevator trim indicator on the Skyview 

system, when i noticed something non-intuitive to me.



The calibration tool has you set full nose up 0V, full nose down 5V, and 

take off position (not flying yet so not sure). However, there is no 

calibration for neutral position, or where the trim tab trailing edge is 

even with the elevator trailing edge which is at 3.2V. Thus, when my 

trim tab is at the neutral position, the indicator is a notch or two 

higher than center.



I was just curious how other systems are calibrated. Is this a 

non-issue? I just intuitively thought this would be useful since we 

can't directly see the trim tab in flight.



We can see the elevator counteweights. Thus, when those are even with 

the HS, can i assume the trim tab trailing edges must be even too?



Jae

40533

Hating paperwork way more than fiberglass work!

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_________________
#40533 RV-10
First flight 10/19/2011
Phase 1 Done 11/26/2011

rene(at)felker.com
Guest

Posted: Wed Sep 14, 2011 9:53 am Post subject: Elevator Trim Indication

I have the GRT system and the calibration goes about the same way, except I

do not get to set a takeoff position.  Wish I could.  I have found no use

for the middle position marker other than to judge how far above I need to

be for takeoff.



Rene' Felker

N423CF

801-721-6080



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coop85(at)verizon.net
Guest

Posted: Wed Sep 14, 2011 10:13 am Post subject: Elevator Trim Indication

I suspect knowing when the trim is at 0 in-flight is not very useful as you only really care about trimming to level flight.  I have the original Allen display and it shows about 1 notch up for takeoff which is pretty close to neutral.



Marcus

On Sep 14, 2011, at 1:14 PM, Jae Chang wrote:






http://dynonavionics.com/cgi-bin/yabb2/YaBB.pl?num=1315888107/0



I was playing with calibrating my elevator trim indicator on the Skyview system, when i noticed something non-intuitive to me.



The calibration tool has you set full nose up 0V, full nose down 5V, and take off position (not flying yet so not sure). However, there is no calibration for neutral position, or where the trim tab trailing edge is even with the elevator trailing edge which is at 3.2V. Thus, when my trim tab is at the neutral position, the indicator is a notch or two higher than center.



I was just curious how other systems are calibrated. Is this a non-issue? I just intuitively thought this would be useful since we can't directly see the trim tab in flight.



We can see the elevator counteweights. Thus, when those are even with the HS, can i assume the trim tab trailing edges must be even too?



Jae

40533

Hating paperwork way more than fiberglass work!

- The Matronics RV10-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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rv10rob(at)gmail.com
Guest

Posted: Wed Sep 14, 2011 11:04 am Post subject: Elevator Trim Indication

Yes, trailing position is irrelevant.  Also, trailing is not necessarily the midpoint of the trim range, so no reason you should expect it to be 2.5v.

  

 -Rob

 On Wed, Sep 14, 2011 at 11:07 AM, Marcus Cooper <coop85(at)verizon.net (coop85(at)verizon.net)> wrote:

  	  Quote: 	
		  --> RV10-List message posted by: Marcus Cooper <coop85(at)verizon.net (coop85(at)verizon.net)>

 

I suspect knowing when the trim is at 0 in-flight is not very useful as you only really care about trimming to level flight.  I have the original Allen display and it shows about 1 notch up for takeoff which is pretty close to neutral.

 

Marcus

  

 



On Sep 14, 2011, at 1:14 PM, Jae Chang wrote:



--> RV10-List message posted by: Jae Chang <jc-matronics_rv10(at)jline.com (jc-matronics_rv10(at)jline.com)>



http://dynonavionics.com/cgi-bin/yabb2/YaBB.pl?num=1315888107/0

 

I was playing with calibrating my elevator trim indicator on the Skyview system, when i noticed something non-intuitive to me.



The calibration tool has you set full nose up 0V, full nose down 5V, and take off position (not flying yet so not sure). However, there is no calibration for neutral position, or where the trim tab trailing edge is even with the elevator trailing edge which is at 3.2V. Thus, when my trim tab is at the neutral position, the indicator is a notch or two higher than center.

 

I was just curious how other systems are calibrated. Is this a non-issue? I just intuitively thought this would be useful since we can't directly see the trim tab in flight.



We can see the elevator counteweights. Thus, when those are even with the HS, can i assume the trim tab trailing edges must be even too?

 

Jae

40533

Hating paperwork way more than fiberglass work!



atures Navigator to browse

 s.com/Navigator?RV10-List" target="_blank">http://www.matronics.com/Navigator?RV10-List

 ronics.com/" target="_blank">http://forums.matronics.com

 Matt Dralle, List Admin.

 =====



	
 

-- 

 Rob Kochman

RV-10 Flying since March 2011

 Woodinville, WA

 http://kochman.net/N819K



  [quote][b]

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rv10flyer(at)verizon.net
Guest

Posted: Wed Sep 14, 2011 2:14 pm Post subject: Elevator Trim Indication

I was rather disappointed with the Skyview trim displays, so I use the VP200 

display for the roll and elevator trim. I have neutral as the trim on the 

elevator is level with the elevator. I'll figure out what neutral really is 

when the plane flies. Having the initial neutral was important to me so I 

know what "flush" is. I'll get the takeoff settings figured out after a few 

takeoffs. No idea what it is now and I sure donâ€™t want too much either.

No idea about the voltage at each setting, only care what I see on the 

display.

Pascal

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jchang10

Joined: 05 Jul 2006
Posts: 227

Posted: Wed Sep 14, 2011 2:37 pm Post subject: Elevator Trim Indication

ok, thanks for the replies. your replies echo what Dynon support     said. Thanks for confirming this for me!

     

     Jae

     40533

     do not archive

     

     On 9/14/2011 11:59 AM, Rob Kochman wrote:     [quote]       Yes, trailing position is irrelevant.  Also, trailing is not         necessarily the midpoint of the trim range, so no reason you         should expect it to be 2.5v.

        

       -Rob

         

       

       On Wed, Sep 14, 2011 at 11:07 AM, Marcus         Cooper <coop85(at)verizon.net (coop85(at)verizon.net)>         wrote:

          	  Quote: 	
		  --> RV10-List message posted by: Marcus           Cooper <coop85(at)verizon.net (coop85(at)verizon.net)>

           

           I suspect knowing when the trim is at 0 in-flight is not very           useful as you only really care about trimming to level flight.            I have the original Allen display and it shows about 1 notch           up for takeoff which is pretty close to neutral.

           

             Marcus

                                   

               

               On Sep 14, 2011, at 1:14 PM, Jae Chang wrote:

               

               --> RV10-List message posted by: Jae Chang <jc-matronics_rv10(at)jline.com (jc-matronics_rv10(at)jline.com)>

               

               http://dynonavionics.com/cgi-bin/yabb2/YaBB.pl?num=1315888107/0

               

               I was playing with calibrating my elevator trim indicator               on the Skyview system, when i noticed something               non-intuitive to me.

               

               The calibration tool has you set full nose up 0V, full               nose down 5V, and take off position (not flying yet so not               sure). However, there is no calibration for neutral               position, or where the trim tab trailing edge is even with               the elevator trailing edge which is at 3.2V. Thus, when my               trim tab is at the neutral position, the indicator is a               notch or two higher than center.

               

               I was just curious how other systems are calibrated. Is               this a non-issue? I just intuitively thought this would be               useful since we can't directly see the trim tab in flight.

               

               We can see the elevator counteweights. Thus, when those               are even with the HS, can i assume the trim tab trailing               edges must be even too?

               

               Jae

               40533

               Hating paperwork way more than fiberglass work!

               

               atures Navigator to browse

               s.com/Navigator?RV10-List"               target="_blank">http://www.matronics.com/Navigator?RV10-List

               ronics.com/"               target="_blank">http://forums.matronics.com

               Matt Dralle, List Admin.

               =====

               

               

               

             

           

         	
       

       

              

       -- 

       Rob Kochman

         RV-10 Flying since March 2011

       Woodinville, WA

       http://kochman.net/N819K

       

        	  Quote: 	
		  

	
     [b]

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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_________________
#40533 RV-10
First flight 10/19/2011
Phase 1 Done 11/26/2011

rene(at)felker.com
Guest

Posted: Wed Sep 14, 2011 3:41 pm Post subject: Elevator Trim Indication

I had two exciting moments during my phase 1.....



1.  On the first takeoff I set my trim to be even with the elevator (No Trim).  The take off was a little exciting.......I started the rotation, the plane took off and then plane kept rotating.  It took both hands to hold the nose down while I adjusted the trim.  I would recommend that on your first flight you put in a little nose down trim.....better to under rotate than to over rotate.



2.  Doing prolonged slips at altitude, be careful which wing is down and what the fuel level is in the selected tank.  Otherwise the fan that keeps the pilot cool stops working.  Leveled out, fuel pump on.....fan started working again....



Rene' Felker

N423CF

801-721-6080

--

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