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AG5B and the Jaguar cowling

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GrummanDude

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

Posted: Mon Apr 05, 2010 11:42 am Post subject: AG5B and the Jaguar cowling

Here is something I ran into last night.  The bottom cowling attach holes on the late model (Tiger LLC) Tigers do not have the same spacing as real Tigers.  For some reason, the spacing is changed by 1/8 inch on the outboard holes (the bottom corners and the holes near the strut) and as much as 1/2 inch for the holes between them.  What a waste of engineering. 

 

  Not only that, but, that means the cowlings are not interchangeable with AA5Bs.  But, then, with the funky inlet, who'd want to?  Right?

 

  

 

   [quote][b]

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GrummanDude

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

Posted: Tue Apr 06, 2010 9:10 am Post subject: AG5B and the Jaguar cowling

So, I talked to the DER about the AG5B and my cowling.  All was going pretty well until he asked what else, besides the air box, was changed in the AG5B.  I told him, "They made it 24 volts."  So, the FAA may want a climb cooling test to see if the alternator on an AG5B runs hotter than an AA5B.   

 

  What a pain in the ass.

 

  

 

 

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Gary
AuCountry Aviation
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flyv35b(at)minetfiber.com
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Posted: Tue Apr 06, 2010 1:27 pm Post subject: AG5B and the Jaguar cowling

 

What makes them think it would run hotter just because it's 24  volts?  Also, It's on the cold side of the baffle and shouldn't see much  engine or exhaust heat.  No real difference from an AA-5B is there?

  

 Cliff

 [quote]   ---

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Discover

Joined: 26 Feb 2007
Posts: 429

Posted: Tue Apr 06, 2010 6:35 pm Post subject: AG5B and the Jaguar cowling

http://www.plane-power.com/Tech_bits_Comparing_Temps24.htm

Would the data above help?

Shows how much less temp the plane power alternator puts out than the factory supplied alternator on the AG5B

My AG5B has this change

Also, the argument that the alternator cooling airflow betwen the factory 12volt planes and the factory 24 volt planes is identical should satisfy both the DER and the FAA

Sent from my iPhone



On Apr 6, 2010, at 4:24 PM, "flyv35b" <flyv35b(at)minetfiber.com (flyv35b(at)minetfiber.com)> wrote:



[quote]  

What makes them think it would run hotter just because it's 24  volts?  Also, It's on the cold side of the baffle and shouldn't see much  engine or exhaust heat.  No real difference from an AA-5B is there?

  

 Cliff

 [quote]   ---

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GrummanDude

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

Posted: Tue Apr 06, 2010 8:42 pm Post subject: AG5B and the Jaguar cowling

The alternator on a Jaguar is open like it was on a Traveler.  I have holes in the cabin heat duct that vent directly on the alternator.  During tests, the alternator was a little warmer, but not by enough to make a difference. 

 

  Cliff,  it's the FAA.  Logic does not come into the picture.

 

  

 

 

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Gary
AuCountry Aviation
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flyv35b(at)minetfiber.com
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Posted: Wed Apr 07, 2010 5:30 am Post subject: AG5B and the Jaguar cowling

Gary, I didn't realize that was the case with your  baffling.  That sounds like a welcome improvement for accessibility to the  alternator.

  

 I realize that logic does not play an important role  in their decision making many times but it sounds like it is your DER that is  making the decision as to whether another cooling test should be run or  not.  Doesn't he have the authority to make such a decision based on the  facts and info available?

  

 Cliff

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GrummanDude

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

Posted: Thu Apr 08, 2010 11:00 am Post subject: AG5B and the Jaguar cowling

We're 'negotiating' right now.  He has done a lot of modified alternators and thinks he can by-pass any testing based on his data and the previous flight test data.  Keep your fingers crossed.

 

  

 

 

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AuCountry Aviation
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