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XL main Spring gear placement/REVERSEAL

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MaxNr(at)aol.com
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Posted: Sun Apr 22, 2007 9:08 pm Post subject: XL main Spring gear placement/REVERSEAL

Flat side fwd or aft? Another step to complete after reversing the spring and before weighing the aircraft is to actually measure the distance from the datum to where ever the axle winds up. The sample W&B worksheet that ZAC provides would be in error if the MLG axle is moved plus or minus four inches. Four inches error in computing the empty CG would be huge on a plane this small. 

 

 Bob from Pace,FL

 XL/Lyc

**************************************

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planecrazydld(at)yahoo.co
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Posted: Mon Apr 23, 2007 2:07 am Post subject: XL main Spring gear placement/REVERSEAL

Oh My! I was assuming that everyone was measuring and setting these dimensions correctly on the W&B sheet. Has anyone actually asked Zenith/CH what the absolute answer is? As Bob pointed out that is a fairly large consequence - especially if it results in masking of a rearward CG condition.



I will try and talk to Zenith and see what they say.



MaxNr(at)aol.com wrote: 	  Quote: 	
		   Flat side fwd or aft? Another step to complete after reversing the spring and before weighing the aircraft is to actually measure the distance from the datum to where ever the axle winds up. The sample W&B worksheet that ZAC provides would be in error if the MLG axle is moved plus or minus four inches. Four inches error in computing the empty CG would be huge on a plane  this small. 

 

 Bob from Pace,FL

 XL/Lyc 	




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John Bolding

Joined: 23 May 2006
Posts: 281

Posted: Mon Apr 23, 2007 2:26 am Post subject: XL main Spring gear placement/REVERSEAL

Another avenue that might be worthy of  consideration is just moving the wheels and axels, leaving the gear leg  alone,  I'm only familiar with doing this on a T18 with standard aircraft  axels, not the Matco 3/4" so you're on your own there. Thorp came up  with the mod. for the same reasons we're talking about, to place  more/less weight on the tailwheel, can't remember for sure (been 20+ yrs  ago) but I think that the tail was getting light due to most folks  putting on heavier engines.

 Neighbor made the mod on his, all it amounted to  was a couple of 1/2" (I think) thick  spacers that were offset drilled. LOT  less hassle. Easy to tune to just how much more/less weight you want to move  around also.  If anyone is interested I'll get next door neighbor to dig up  the print.

 LOW&SLOW    John  Bolding

    

 [quote]   ---

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davgray(at)sbcglobal.net
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Posted: Mon Apr 23, 2007 3:52 am Post subject: XL main Spring gear placement/REVERSEAL

There is no absolute answer that applies to all  aircraft except that the CG must fall within 20-30% MAC for all  flights.

  

 When you do the W&B for your aircraft, it is  necessary to take an actual measurement with a plum bob from the datum to each  axle.  Combined with the weights measured at each wheel when the  aircraft is perfectly level and empty, you will be able to calculate the  CG.

   You can't use measurements from another  aircraft.  The weights and arms will be different for each aircraft  but the calculations still show the CG for your aircraft.

  

 Gary Ray

  

  

 [quote]   ---

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planecrazydld(at)yahoo.co
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Posted: Mon Apr 23, 2007 8:39 am Post subject: XL main Spring gear placement/REVERSEAL

I would be interested John.

   

  do not archive



John Bolding <jnbolding1(at)teleshare.net> wrote:

  [quote]        Another avenue that might be worthy of consideration is just moving the wheels and axels, leaving the gear leg alone,  I'm only familiar with doing this on a T18 with standard aircraft axels, not the Matco 3/4" so you're on your own there. Thorp came up with the mod. for the same reasons we're talking about, to place more/less weight on the tailwheel, can't remember for sure (been 20+ yrs ago) but I think that the tail was getting light due to most folks putting on heavier engines.

  Neighbor made the mod on his, all it amounted to was  a couple of 1/2" (I think) thick  spacers that were offset drilled. LOT less hassle. Easy to tune to just how much more/less weight you want to move around also.  If anyone is interested I'll get next door neighbor to dig up the print.

  LOW&SLOW    John Bolding

     

  [quote]  ---

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