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Phase 1 report and GRT with the 'leans'

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ron.mcgann(at)baesystems.
Guest

Posted: Tue May 05, 2009 3:44 pm Post subject: Phase 1 report and GRT with the 'leans'

G’day all,  

   

Phase 1 flight testing is complete.  As others that are flying already well know, this one sensational aircraft!!  My stick time has been limited, but just supporting the ‘mandatory crew’ testing of Vx/Vy and gross weight has furthered my grin!  Keep pounding those rivets – it is really well worth the effort.  

   

Here is my squawk list (if you can call it that):  

   

<![if !supportLists]>a.                   <![endif]>had to replace a valve core to stop left main deflating  

<![if !supportLists]>b.                   <![endif]>adjusted governor to correct underspeed at full throttle  

<![if !supportLists]>c.                   <![endif]>added fixed rudder trim  

<![if !supportLists]>d.                   <![endif]>added fixed aileron trim (very small amount) to account slightly heavy right wing  

<![if !supportLists]>e.                   <![endif]>removed a bug (literally!!) from the left tank vent line that fully blocked the vent.  I have seen photos of an RV8 with a crushed tank that resulted from the vent being blocked and the vacuum created by pumping out the fuel – makes for a very bad day.  The bug must have crawled in during the VERY brief period in which the tanks were empty for fuel calibration.  CHECK THOSE VENTS!  

<![if !supportLists]>f.                     <![endif]>Dodgy CHT sensor (or connection)  

<![if !supportLists]>g.                   <![endif]>My GRT EFIS presents a slight roll (~3degs) on some occasions.  This is intermittent, not significant, just bloody annoying.  The skid ball is also way out – no correlation to the mechanical ball at all.  

   

I thought my GRT installation was pretty standard for a -10, the AHRS and magnetometer are located on a shelf aft and rear of the battery and A/P pitch servo.  Plenty of distance from battery, antennas, A/P, mounted with non magnetic hw etc.  The only magnetic item within cooee is the rear seat harness attach cables.  Carols from GRT still believes it may be a magnetometer interference issue.  Anyone else had similar problems, and how difficult is it to move the magnetometer to the wing tip while maintaining alignment with the AHRS?  

   

Cheers  

Ron  

VH-XRM

 Flying ---  man THAT sounds good   

   

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tc1234c(at)roadrunner.com
Guest

Posted: Tue May 05, 2009 4:19 pm Post subject: Phase 1 report and GRT with the 'leans'

Ron,

  

 On  your point g. the GRT EFIS lean and skid ball problem, you may want to talk to  Mark Allen at GRT.  Early on I had the same problem with my 9A. After  talking to Mark I sent him a log file. Based on the log  file, Mark told me one of the sensor was off. They fixed that problem for me and  it was more than 400 hours ago. 

  

 Ted

 

------------------------------------------

T.C. Chang

http://3limafoxtrot.com/

RV-9A, Lycoming  (ECI) O320-D2A, 160 hp, Carb, left Mag + right Lightspeed EI, Sensenich  FP

GRT dual DU H1, TT DigiFlight II VSGV, 572 hrs Hobbs

Last flight: http://www.mail2600.com/cgi-bin/track.cgi?call=KD8IIR&last=1



RV10  emp, #40948

 [quote]   

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pitts_pilot(at)bellsouth.
Guest

Posted: Tue May 05, 2009 4:33 pm Post subject: Phase 1 report and GRT with the 'leans'

Kudos Ron!!!



McGANN, Ron wrote:

 	  Quote: 	
		   G’day all,

 

  

 

 Phase 1 flight testing is complete.  As others that are flying already 

 well know, this one sensational aircraft!!  My stick time has been 

 limited, but just supporting the ‘mandatory crew’ testing of Vx/Vy and 

 gross weight has furthered my grin!  Keep pounding those rivets – it is 

 really well worth the effort.

It's news like this that keeps me going. >
	


 	  Quote: 	
		   Here is my squawk list (if you can call it that):=

 

 a.                   had to replace a valve core to stop left main deflating

 

 b.                   adjusted governor to correct underspeed at full 

 throttle

 

 c.                   added fixed rudder trim

 

 d.                   added fixed aileron trim (very small amount) to 

 account slightly heavy right wing

 

 e.                   removed a bug (literally!!) from the left tank vent 

 line that fully blocked the vent.  I have seen photos of an RV8 with a 

 crushed tank that resulted from the vent being blocked and the vacuum 

 created by pumping out the fuel – makes for a very bad day.  The bug 

 must have crawled in during the VERY brief period in which the tanks 

 were empty for fuel calibration.  CHECK THOSE VENTS!

We have mud daubers where I live (FL) and they like tank vents with or 
	


without fuel in the tanks!!!  Take a pipe cleaner and bend it like a 'W' 

and insert the middle bend up inside the vent.  Should keep the critters 

out.

 	  Quote: 	
		   

 f.                     Dodgy CHT sensor (or connection)

 

 g.                   My GRT EFIS presents a slight roll (~3degs) on some 

 occasions.  This is intermittent, not significant, just bloody annoying. 

  The skid ball is also way out – no correlation to the mechanical ball 

 at all.

 

 I thought my GRT installation was pretty standard for a -10, the AHRS 

 and magnetometer are located on a shelf aft and rear of the battery and 

 A/P pitch servo.  Plenty of distance from battery, antennas, A/P, 

 mounted with non magnetic hw etc.  The only magnetic item within cooee 

 is the rear seat harness attach cables.  Carols from GRT still believes 

 it may be a magnetometer interference issue.  Anyone else had similar 

 problems, and how difficult is it to move the magnetometer to the wing 

 tip while maintaining alignment with the AHRS?

My thoughts on this are the distance between the yaw axis and the 
	


mechanical ball Vs. the distance to the AHRS.  Your AHRS is pretty far 

aft, so the reading MAY be accurate ..... if it's really mounted correctly.

Linn



 	  Quote: 	
		   

  

 

 Cheers

 

 Ron

 

 VH-XRM

 Flying ---  man THAT sounds good

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