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Fiberglass vs Carbon Fiber for my layup

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galinhdz(at)gmail.com
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Posted: Thu Aug 13, 2015 2:12 pm Post subject: Fiberglass vs Carbon Fiber for my layup

As I get ready to do the layups for the landing gear I was wondering about using Carbon Fiber instead of Fiberglass.Â Let's say instead of 10 plies of glass, use 5 plies of carbon. What would be the pros and cons of this idea? Good idea or bad idea?Â  What sayeth the list?

  [quote][b]

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sstearns2(at)yahoo.com
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Posted: Thu Aug 13, 2015 3:09 pm Post subject: Fiberglass vs Carbon Fiber for my layup

I would stick with glass.  It is difficult to tell if wet layup carbon fiber is fully wetted out with epoxy.   Also, sometimes the thickness of the layup has structural advantages.   It is also difficult to get carbon to conform to any kind of a corner.

Scott



Sent from my iPad



On Aug 13, 2015, at 4:12 PM, Galin Hernandez <galinhdz(at)gmail.com (galinhdz(at)gmail.com)> wrote:

[quote]As I get ready to do the layups for the landing gear I was wondering about using Carbon Fiber instead of Fiberglass. Let's say instead of 10 plies of glass, use 5 plies of carbon. What would be the pros and cons of this idea? Good idea or bad idea?  What sayeth the list?

   	  Quote: 	
		  

	
   

[b]

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fredorosa(at)gmail.com
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Posted: Thu Aug 13, 2015 3:16 pm Post subject: Fiberglass vs Carbon Fiber for my layup

I think 10 glass or 5 Carbon plies is pretty much a wash.  If you really want to beef it up use 10 plies of Carbon. 



Sent from my iPhone



On Aug 13, 2015, at 6:12 PM, Galin Hernandez <galinhdz(at)gmail.com (galinhdz(at)gmail.com)> wrote:

[quote]As I get ready to do the layups for the landing gear I was wondering about using Carbon Fiber instead of Fiberglass. Let's say instead of 10 plies of glass, use 5 plies of carbon. What would be the pros and cons of this idea? Good idea or bad idea?  What sayeth the list?

   	  Quote: 	
		  

	


[b]

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galinhdz(at)gmail.com
Guest

Posted: Thu Aug 13, 2015 4:18 pm Post subject: Fiberglass vs Carbon Fiber for my layup

THANKS but I was wondering more along the lines of Carbon vs Glass, not the actual number of plies. Assuming the strength will be the same (no beefing up) what are the pros and cons ofÂ more plies of glass versus less plies of carbon or does it really matter? 



On Thu, Aug 13, 2015 at 7:16 PM, Alfred Rosa <fredorosa(at)gmail.com (fredorosa(at)gmail.com)> wrote:

[quote]I think 10 glass or 5 Carbon plies is pretty much a wash.Â  If you really want to beef it up use 10 plies of Carbon.Â 



Sent from my iPhone



On Aug 13, 2015, at 6:12 PM, Galin Hernandez <galinhdz(at)gmail.com (galinhdz(at)gmail.com)> wrote:

 	  Quote: 	
		  As I get ready to do the layups for the landing gear I was wondering about using Carbon Fiber instead of Fiberglass.Â Let's say instead of 10 plies of glass, use 5 plies of carbon. What would be the pros and cons of this idea? Good idea or bad idea?Â  What sayeth the list?

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[b]

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aeromomentum(at)yahoo.com
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Posted: Fri Aug 14, 2015 6:02 am Post subject: Fiberglass vs Carbon Fiber for my layup

Hi Galin,



I will be up there soon.  Really.  I just have a lot of catching up to do.



The choice between carbon and glass is not that simple.  Yes, carbon is about 2.5 times as strong and as stiff as glass.  But they way they are used actually can have a larger impact on strength and stiffness.  For example in bending a solid layup of 10 plies of glass is stronger and stiffer than a solid layup of 5 plies carbon since the glass is twice as thick.  Keep in mind that when you double the thickness you about quadruple the bending strength and the stiffness increases about 8 times.



So to replace the 20 total plies of glass you would need a total of about 13 plies of carbon to get the same bending strength.  But to get the same bending stiffness you would need about 15 plies of carbon.



Since your repair is more of a local stiffness issue you really need to meet (or beat) the original stiffness.



That being said, since the outer plies are doing more work a glass and carbon sandwich can work very well.  But this will require a semi balanced layup with carbon on both sides.  Or the original layup in glass with the addition of carbon more as an integrated backing plate.



There are many ways to do this that will work.  But if it was me I would also want to make it so it will never happen again.  I like 8 plies glass and 3 plies carbon from the outside (bottom) and 10 plies glass and 5 plies carbon from the inside.  It can also be done all carbon and this would save about 5 plies total so would maybe be a little neater.



Mark Kettering



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

On Thu, 8/13/15, Galin Hernandez <galinhdz(at)gmail.com> wrote:



 Subject: Re: Fiberglass vs Carbon Fiber for my layup

 To: "kis-list(at)matronics.com" <kis-list(at)matronics.com>

 Date: Thursday, August 13, 2015, 8:18 PM

 

 THANKS but I was

 wondering more along the lines of Carbon vs Glass, not the

 actual number of plies. Assuming the strength will be the

 same (no beefing up) what are the pros and cons of more

 plies of glass versus less plies of carbon or does it really

 matter? 

 On Thu, Aug 13, 2015

 at 7:16 PM, Alfred Rosa <fredorosa(at)gmail.com>

 wrote:

 I think 10 glass or 5

 Carbon plies is pretty much a wash.  If you really want to

 beef it up use 10 plies of Carbon. 

 

 Sent from my iPhone

 On Aug 13, 2015, at 6:12 PM, Galin Hernandez <galinhdz(at)gmail.com>

 wrote:

 

 As I get

 ready to do the layups for the landing gear I was wondering

 about using Carbon Fiber instead of Fiberglass. Let's

 say instead of 10 plies of glass, use 5 plies of carbon.

 What would be the pros and cons of this idea? Good idea or

 bad idea?  What sayeth the list?

 

 

 

 

 

 

 

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