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Looking for some advise

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wayne.e(at)grandecom.net
Guest

Posted: Fri Sep 07, 2007 6:12 am Post subject: Looking for some advise

I have couple of issues that maybe you ace  mechanics/builders out there can assist me with.

  

 Problem 1

  

 It appears that I have a right wing that is a  little bit heavy. On the ground when I push the stick to the right it will  spring back to the center/ neutral position when I let go. However when I  push the stick to the left, again on the ground, and let go it doesn't  return to the center position. The trim spring is in the left wing so to me I  guess that make sense, but is this the same thing that all of you are  experiencing? I'm thinking I may need to lower my right flap just a little to  bring the wing back up. Has anyone had this problem?

  

 Problem 2 - A little more complex.

  

 I have an Aerosport Power new IO540 engine with  LASAR Electronic Ignition. On my first flight I lost one of my mags. We  installed a new mag and retimed the engine. I am having a 200 to 225 rpm drop on  each mag on run-up check, even for both sides. In flight at 23sq and leaned out,  I did a mag test and got little or no mag drop on either mag. Also if on the  ground I lean out the engine for 1700rpm run-up I will get a normal mag drop of  50 to 100. The symptom appears to be too rich of a fuel servo on the  ground.

  

 Anyway here's what we've done so far, some sound a  little strange, but people were giving me their suggestions and I have been  giving their ideas a go.

  

 - I changed the plugs to a fine wire  plug.

  

 - I changed the fuel servo out, which I really  believed was going to solve the problem.

  

 - I leaned out the idle mixture more, but in my  mind this really doesn't affect the mixture at 1700rpm, but just taking  suggested measures.

  

 - I talked to a tech at Unison, LASAR, and he says  he is confident that it's not the LASAR box. I'm still not sure on this  one.

  

 Anyway after all of this I still have the mag drop.  I've talked at length with Bart at Aerosport, really nice guy, and he's a little  stumped also. They are going to fuel flow another fuel servo for me that will be  leaned out by them at the factory. I'm really not understanding this one. Why  would I need a fuel servo that has had special adjustments made to it versus any  other IO540. I need to talk to him again on this. I still keep thinking it's the  way we've timed it, but we've checked that a couple of times. ??

  

 Anyway if any of you smart sharp shooters out  there have any great ideas for me I would appreciate your feed  back.

  

 Wayne Edgerton N602WT

  

 In the paint shop and stuck with honey do lists  :>}

   [quote][b]

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davelammers(at)mchsi.com
Guest

Posted: Fri Sep 07, 2007 7:56 am Post subject: Looking for some advise

Wayne,

 On problem 1, I suggest that before you do anything with the airframe such as flap adjustment, that you evaluate the wing heaviness with the trim springs disconnected.  In a (theoretically) frictionless system, it should make no difference as to which wing the trim springs/servo is mounted.  Your on ground problem sounds to me like something is rubbing (friction) differently when you move left to right.

 Again, in my judgment, your in air problem should be evaluated first with the trim system not "in the loop".

 Problem 2 ?????????/

 Regards

 Dave Lammers

 

 Wayne Edgerton wrote: [quote]            I have couple of issues that maybe you ace mechanics/builders out there can assist me with.

    

   Problem 1

    

   It appears that I have a right wing that is a little bit heavy. On the ground when I push the stick to the right it will spring back to the center/ neutral position when I let go. However when I push the stick to the left, again on the ground, and let go it doesn't return to the center position. The trim spring is in the left wing so to me I guess that make sense, but is this the same thing that all of you are experiencing? I'm thinking I may need to lower my right flap just a little to bring the wing back up. Has anyone had this problem?

    

   Problem 2 - A little more complex.

    

   I have an Aerosport Power new IO540 engine with LASAR Electronic Ignition. On my first flight I lost one of my mags. We installed a new mag and retimed the engine. I am having a 200 to 225 rpm drop on each mag on run-up check, even for both sides. In flight at 23sq and leaned out, I did a mag test and got little or no mag drop on either mag. Also if on the ground I lean out the engine for 1700rpm run-up I will get a normal mag drop of 50 to 100. The symptom appears to be too rich of a fuel servo on the ground.

    

   Anyway here's what we've done so far, some sound a little strange, but people were giving me their suggestions and I have been giving their ideas a go.

    

   - I changed the plugs to a fine wire plug.

    

   - I changed the fuel servo out, which I really believed was going to solve the problem.

    

   - I leaned out the idle mixture more, but in my mind this really doesn't affect the mixture at 1700rpm, but just taking suggested measures.

    

   - I talked to a tech at Unison, LASAR, and he says he is confident that it's not the LASAR box. I'm still not sure on this one.

    

   Anyway after all of this I still have the mag drop. I've talked at length with Bart at Aerosport, really nice guy, and he's a little stumped also. They are going to fuel flow another fuel servo for me that will be leaned out by them at the factory. I'm really not understanding this one. Why would I need a fuel servo that has had special adjustments made to it versus any other IO540. I need to talk to him again on this. I still keep thinking it's the way we've timed it, but we've checked that a couple of times. ??

    

   Anyway if any of you smart sharp shooters out there have any great ideas for me I would appreciate your feed back.

    

   Wayne Edgerton N602WT

    

   In the paint shop and stuck with honey do lists :>}

    	  Quote: 	
		  

	
   

   

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apilot2(at)gmail.com
Guest

Posted: Fri Sep 07, 2007 10:45 am Post subject: Looking for some advise

Re problem 2. 

You need to isolate the problem. The easiest way to do that is to switch the LASAR system off, so that you are operating on the mags only. Then make the same checks you have done before. It should be have normally, indicating the electronic ignition is the problem. If it does the same as with the electronics, it would seem you have a fuel problem. Lean the idle fuel adjustment to where you get no more than 25rpm rise on pulling mixture to idle cutoff.  However, idle mixture makes no difference for your runup rpm and above. Question would be what EGT you see on takeoff, and at low altitude full throttle, full rich. It should be around 1250, plus or minus 50. Any colder is too rich. Hotter that is too lean. 



On 9/7/07, Wayne Edgerton <wayne.e(at)grandecom.net (wayne.e(at)grandecom.net)> wrote: 	  Quote: 	
		          I have couple of issues that maybe you ace  mechanics/builders out there can assist me with.

  

 Problem 1

  

 It appears that I have a right wing that is a  little bit heavy. On the ground when I push the stick to the right it will  spring back to the center/ neutral position when I let go. However when I  push the stick to the left, again on the ground, and let go it doesn't  return to the center position. The trim spring is in the left wing so to me I  guess that make sense, but is this the same thing that all of you are  experiencing? I'm thinking I may need to lower my right flap just a little to  bring the wing back up. Has anyone had this problem?

  

 Problem 2 - A little more complex.

  

 I have an Aerosport Power new IO540 engine with  LASAR Electronic Ignition. On my first flight I lost one of my mags. We  installed a new mag and retimed the engine. I am having a 200 to 225 rpm drop on  each mag on run-up check, even for both sides. In flight at 23sq and leaned out,  I did a mag test and got little or no mag drop on either mag. Also if on the  ground I lean out the engine for 1700rpm run-up I will get a normal mag drop of  50 to 100. The symptom appears to be too rich of a fuel servo on the  ground.

  

 Anyway here's what we've done so far, some sound a  little strange, but people were giving me their suggestions and I have been  giving their ideas a go.

  

 - I changed the plugs to a fine wire  plug.

  

 - I changed the fuel servo out, which I really  believed was going to solve the problem.

  

 - I leaned out the idle mixture more, but in my  mind this really doesn't affect the mixture at 1700rpm, but just taking  suggested measures.

  

 - I talked to a tech at Unison, LASAR, and he says  he is confident that it's not the LASAR box. I'm still not sure on this  one.

  

 Anyway after all of this I still have the mag drop.  I've talked at length with Bart at Aerosport, really nice guy, and he's a little  stumped also. They are going to fuel flow another fuel servo for me that will be  leaned out by them at the factory. I'm really not understanding this one. Why  would I need a fuel servo that has had special adjustments made to it versus any  other IO540. I need to talk to him again on this. I still keep thinking it's the  way we've timed it, but we've checked that a couple of times. ??

  

 Anyway if any of you smart sharp shooters out  there have any great ideas for me I would appreciate your feed  back.

  

 Wayne Edgerton N602WT

  

 In the paint shop and stuck with honey do lists  :>}

   



[/b] 	


[b]

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