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0-200 motor mount

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wjones(at)brazoriainet.co
Guest

Posted: Sat Dec 29, 2007 10:17 am Post subject: 0-200 motor mount

Hello group ,I am just about ready to start welding  on the 0200 mount .My plan was to shorten the mount for W/B for the additional  weight of the 0200 .On second thought ZAC may have already taken this  into consideration when the plans were drawn . I think that I would have no  problem building it 1" to 2"  shorter than the plans and still have room  .Any thoughts  .                                                                  Wade Jones    South Texas  

601XL plans building

Cont. 0200

   [quote][b]

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larry(at)macsmachine.com
Guest

Posted: Sat Dec 29, 2007 1:32 pm Post subject: 0-200 motor mount

Hi Wade,

Intuitively, if the mount at 2 inches shorter was not a problem, you 

could really benefit by moving the CG back a little.  It might also 

interfere with disassembly of magnetos or

such between, so it's not just a fit as is.  Also, the cowling might be 

affected at the prop end, requiring adjustment in length at the rear.  

You might put this question to Nick at Zenith for an estimate of best 

options.



Larry McFarland 601HDS at www.macsmachine.com



wade jones wrote:

 	  Quote: 	
		   Hello group ,I am just about ready to start welding on the 0200 mount 

 .My plan was to shorten the mount for W/B for the additional weight of 

 the 0200 .On second thought ZAC may have already taken this 

 into consideration when the plans were drawn . I think that I would 

 have no problem building it 1" to 2"  shorter than the plans and still 

 have room .Any thoughts 

 .                                                                 Wade 

 Jones    South Texas

 601XL plans building

 Cont. 0200

 *

 *

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psm(at)ATT.NET
Guest

Posted: Sat Dec 29, 2007 5:38 pm Post subject: 0-200 motor mount

Hi Wade,



 I have no special expertise in engine mounts, but I am in the middle of mounting the engine in my XL right now.  So I guess I will respond to your request for any thoughts.



 There are a number of issues that seem to come together in the engine mount.  There is the position of the engine with regard to the top longerons.  There is also the angle the engine makes for both pitch and yaw.  



 I think it is important that the engine be located so the thrust line is right at the top longerons.  I wish I knew the correct angles for the engine to make compared to the fuselage center lines.  I sent a request to ZAC with this question but have not received an answer.  I also did some reading in "Firewall Forward" by Tony Bingelis.  Tony indicated it is common for the engine to make a 3 degree right yaw angle to the fuselage.  He also indicated the engine should not have any positive or negative pitch angle.  (Of course, the 3 degrees right supposes a standard clockwise propeller rotation.)



 I suspect all three of these issues are more important than the CG issue you mentioned.  For CG you can do some weight additions or move the battery around.  However, once the position and angles of the engine are fixed there isn't much you can do to change it.



 Good Luck



 Paul

 XL fuselage

 do not archive



 

 At 10:16 AM 12/29/2007, you wrote:



 [quote]Hello group ,I am just about ready to start welding on the 0200 mount .My plan was to shorten the mount for W/B for the additional weight of the 0200 .On second thought ZAC may have already taken this into consideration when the plans were drawn . I think that I would have no problem building it 1" to 2"  shorter than the plans and still have room .Any thoughts .                                                                 Wade Jones    South Texas 

 601XL plans building

 Cont. 0200

 

  	  Quote: 	
		  

[/b] 	
[b]

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