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Cowling Update. Redux

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GrummanDude

Joined: 15 Jan 2006
Posts: 926
Location: Auburn, CA

Posted: Thu Sep 13, 2007 12:59 am Post subject: Cowling Update. Redux

I almost forgot.



They now want me to show that my cowling is resistant to lightning 

strikes.



So, does anyone know how other fiberglass cowlings are passing the 

lightning strike tests?

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_________________
Gary
AuCountry Aviation
Home of Team Grumman

flyv35b(at)minetfiber.com
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Posted: Thu Sep 13, 2007 4:47 am Post subject: Cowling Update. Redux

How did American General do it - or did they?  What a bunch of BS!

---

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jamey

Joined: 10 Jan 2006
Posts: 124

Posted: Thu Sep 13, 2007 8:04 am Post subject: Cowling Update. Redux

I don't know how you'd demonstrate that but I just got to tour the

Hawker-Beech factories and their carbon-fiber fuselages and parts have

aluminum (I think) woven in the top layer of fabric in the lay-up which I

guess somehow ties into a system for distributing such events evenly over

the airframe.  This seems excessive for the cowl on a wee Grumman vs. a

Hawker 4000 though.



Jamey



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flyv35b(at)minetfiber.com
Guest

Posted: Thu Sep 13, 2007 8:15 am Post subject: Cowling Update. Redux

Did you go to the ABS convention at Wichita?  How many Bonanzas were there?



Cliff

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az_gila

Joined: 17 Jun 2006
Posts: 99
Location: Tucson, AZ

Posted: Thu Sep 13, 2007 9:03 am Post subject: Cowling Update. Redux

The question to ask them would be "what specification does it have to meet?"



 Lightening strike sounds rather vague.....:^)



 gil A



 

 At 09:04 AM 9/13/2007, you wrote:

 [quote]--> TeamGrumman-List message posted by: "James Courtney" <jamey(at)jamescourtney.net>



 I don't know how you'd demonstrate that but I just got to tour the

 Hawker-Beech factories and their carbon-fiber fuselages and parts have

 aluminum (I think) woven in the top layer of fabric in the lay-up which I

 guess somehow ties into a system for distributing such events evenly over

 the airframe.  This seems excessive for the cowl on a wee Grumman vs. a

 Hawker 4000 though.



 Jamey

 [b]

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jbowman90(at)YAHOO.COM
Guest

Posted: Fri Sep 14, 2007 3:53 am Post subject: Cowling Update. Redux

Don't know how other ones are passing the test, but the way composites are

typically given lightning protection is to embed a metal mesh in the layup.  I

didn't think this was critical for fiberglass, only graphite composites. 

Graphic will conduct, but it also has higher resistance than metal.  So a bolt

of lightning will cause extremely rapid heating, in other words an explosion. 

By embedding a metal mesh, you are providing a lower impedance path for the

electrons to flow.  I wonder if you could argue that there is already a bunch

of fiberglass (wingtips, nose bowl) on the Grummans to get out of the testing.



Jason



 	  Quote: 	
		   

 I almost forgot.

 

 They now want me to show that my cowling is resistant to lightning 

 strikes.

 

 So, does anyone know how other fiberglass cowlings are passing the 

 lightning strike tests?

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flyv35b(at)minetfiber.com
Guest

Posted: Fri Sep 14, 2007 5:54 am Post subject: Cowling Update. Redux

And maybe more importantly did American General have to embed any metal in 

their cowling?



Cliff

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Discover

Joined: 26 Feb 2007
Posts: 429

Posted: Fri Sep 14, 2007 6:40 am Post subject: Cowling Update. Redux

Just toured the Columbia factory Wednesday and saw the wire mesh installed on the outer surface of the"fiberglass" wing. The wing has very little carbon fiber in it, only at a few hard spots is carbon used n the Columbia.



I don't think my AG5B has any metal mesh or other lightning strike considerations in the cowl. It does consist of carbon fiber and fiberglass.



I just don't think the FAA should be able to hold Gary's cowl to regulations not in force at the time the TCDS was approved on the grummans....I think this was true of the AG5B



---- Jason Bowman <jbowman90(at)YAHOO.COM> wrote: 




Don't know how other ones are passing the test, but the way composites are

typically given lightning protection is to embed a metal mesh in the layup.  I

didn't think this was critical for fiberglass, only graphite composites. 

Graphic will conduct, but it also has higher resistance than metal.  So a bolt

of lightning will cause extremely rapid heating, in other words an explosion. 

By embedding a metal mesh, you are providing a lower impedance path for the

electrons to flow.  I wonder if you could argue that there is already a bunch

of fiberglass (wingtips, nose bowl) on the Grummans to get out of the testing.



Jason



 	  Quote: 	
		   

 I almost forgot.

 

 They now want me to show that my cowling is resistant to lightning 

 strikes.

 

 So, does anyone know how other fiberglass cowlings are passing the 

 lightning strike tests?

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flyhoss(at)YAHOO.COM
Guest

Posted: Tue Sep 18, 2007 5:02 pm Post subject: Cowling Update. Redux

Tonight's top picks. What will you watch tonight? ">Preview the hottest shows on Yahoo! TV. [quote][b]

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