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Rear stick pressure

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aspen1150(at)yahoo.com
Guest

Posted: Sat Jul 01, 2006 6:17 am Post subject: Rear stick pressure

Having flown my XL yesterday for the first time  after 2 1/2 yrs of building time,  I found it to be nose heavy.  From take off to landing I had to maintain constant back pressure on the stick. Wondering if anyone else has experienced this characteristic on their XL?

  I've checked the weight and balance again and feel it's within limits plus hate adding weight to the tail end if that's not the real problem.  I've thought of lowering the front of the stabilizer and even lowering the rear wing spar changing the attach angle.

  Does anyone out there have any other suggestions or ideas?

  Thanks,  N 105JT



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clojan(at)sbcglobal.net
Guest

Posted: Sat Jul 01, 2006 6:51 am Post subject: Rear stick pressure

Jim: I also did not have enough up trim to take the back pressure off of the stick. I riveted a 1" tab to the back of the trim tab with a little down bend and now I have lots of up.  The back pressure is quite a bit less with 2 in the cockpit. jack



Jim <aspen1150(at)yahoo.com> wrote:   	  Quote: 	
		    Having flown my XL yesterday for the first time  after 2 1/2 yrs of building time,  I found it to be nose heavy.  From take off to landing I had to maintain constant back pressure on the stick. Wondering if anyone else has experienced this characteristic on their XL?

  I've checked the weight and balance again and feel it's within limits plus hate adding weight to the tail end if that's not the real problem.  I've thought of lowering the front of the stabilizer and even lowering the rear  wing spar changing the attach angle.

  Does anyone out there have any other suggestions or ideas?

  Thanks,  N 105JT

      Talk is cheap. Use Yahoo! Messenger to make PC-to-Phone calls. Great rates starting at 1¢/min.

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aspen1150(at)yahoo.com
Guest

Posted: Sat Jul 01, 2006 8:03 am Post subject: Rear stick pressure

Thanks Jack,  I give that a try.

  Jim



Jack Russell <clojan(at)sbcglobal.net> wrote:

   	  Quote: 	
		  Jim: I also did not have enough up trim to take the back pressure off of the stick. I riveted a 1" tab to the back of the trim tab with a little down bend and now I have lots of up.  The back pressure is quite a bit less with 2 in the cockpit. jack



Jim <aspen1150(at)yahoo.com> wrote:    	  Quote: 	
		    Having flown my XL yesterday for the first time  after 2 1/2 yrs of building time,  I found it to be nose heavy.  From take off to landing I had to maintain constant back pressure on the stick. Wondering if anyone else has experienced this characteristic on their XL?

  I've checked the  weight and balance again and feel it's within limits plus hate adding weight to the tail end if that's not the real problem.  I've thought of lowering the front of the stabilizer and even lowering the rear wing spar changing the attach angle.

  Does anyone out there have any other suggestions or ideas?

  Thanks,  N 105JT

      Talk is cheap. Use Yahoo! Messenger to make PC-to-Phone calls. Great rates starting at 1¢/min.

	


	




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bryanmmartin

Joined: 10 Jan 2006
Posts: 1018

Posted: Sat Jul 01, 2006 3:15 pm Post subject: Rear stick pressure

I had the same problem with mine, I could not trim out the elevator  

force. I first tried duct taping a sheet of aluminum to the trim tab  

so as to double its size and then I was able to trim it out in  

flight. I was still using most of the trim travel to get it trimmed  

so I made a new set of front stabilizer attach brackets that brought  

the front of the stabilizer down about half an inch and I was able to  

fly hands off with the trim tab near neutral position in cruise. I  

still can't trim it out with more than about five degrees of flaps  

but that only happens on short final so I haven't been very motivated  

to fix it yet. I will probably add some area to the trim tab  

eventually to get more trim authority but It's not high on my  

priority list right now. I did add a bungee cord to eh elevator cable  

to help out the trim tab and it helped some. At least now the  

elevator doesn't slam down against the stops when you let go of the  

stick on the ground, the bungee holds it in the neutral position.



By the way, changing the angle of incidence of the main wing is not  

the way to solve this problem. That will mainly just change the angle  

the of the fuselage in flight and you will still have to hold the  

nose up to maintain level flight. It's the horizontal stabilizer and  

elevator that control pitch trim. It takes a large change in main  

wing attachment to have much effect on pitch trim.



On Jul 1, 2006, at 10:17 AM, Jim wrote:



 	  Quote: 	
		   Having flown my XL yesterday for the first time  after 2 1/2 yrs of  

 building time,  I found it to be nose heavy.  From take off to  

 landing I had to maintain constant back pressure on the stick.  

 Wondering if anyone else has experienced this characteristic on  

 their XL?

 I've checked the weight and balance again and feel it's within  

 limits plus hate adding weight to the tail end if that's not the  

 real problem.  I've thought of lowering the front of the stabilizer  

 and even lowering the rear wing spar changing the attach angle.

 Does anyone out there have any other suggestions or ideas?

 Thanks,  N 105JT




	


-- 

Bryan Martin

N61BM, CH 601 XL, Stratus Subaru.

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_________________
--
Bryan Martin
N61BM, CH 601 XL, Stratus Subaru.
do not archive.

aspen1150(at)yahoo.com
Guest

Posted: Sat Jul 01, 2006 5:27 pm Post subject: Rear stick pressure

Bryan,

  Thanks for the info,  between you and Jack I now have a couple of ideas to try.

  Jim N105JT



Bryan Martin <bryanmmartin(at)comcast.net> wrote:

  [quote]--> Zenith-List message posted by: Bryan Martin 



I had the same problem with mine, I could not trim out the elevator 

force. I first tried duct taping a sheet of aluminum to the trim tab 

so as to double its size and then I was able to trim it out in 

flight. I was still using most of the trim travel to get it trimmed 

so I made a new set of front stabilizer attach brackets that brought 

the front of the stabilizer down about half an inch and I was able to 

fly hands off with the trim tab near neutral position in cruise. I 

still can't trim it out with more than about five degrees of flaps 

but that  only happens on short final so I haven't been very motivated 

to fix it yet. I will probably add some area to the trim tab 

eventually to get more trim authority but It's not high on my 

priority list right now. I did add a bungee cord to eh elevator cable 

to help out the trim tab and it helped some. At least now the 

elevator doesn't slam down against the stops when you let go of the 

stick on the ground, the bungee holds it in the neutral position.



By the way, changing the angle of incidence of the main wing is not 

the way to solve this problem. That will mainly just change the angle 

the of the fuselage in flight and you will still have to hold the 

nose up to maintain level flight. It's the horizontal stabilizer and 

elevator that control pitch trim. It takes a large change in main 

wing attachment to have much effect on pitch trim.



On Jul 1, 2006, at 10:17 AM, Jim wrote:



[quote] Having flown my XL yesterday for the

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