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Baffles

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GrummanDude

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

Posted: Mon Jan 22, 2007 12:14 am Post subject: Baffles

Interesting discovery today.  I'm installing an 8406 oil cooler on a 

Cheetah using the Fletchair STC.  I decided to make my own baffles 

instead of modifying the baffles per the STC.  In the process, I 

discovered the left rear baffle (the one the oil cooler mounts to) on 

the Cheetah/Traverler (75) is about 1/2 to 5/8 inch too short.  That 

is, it's too short for the given gap to the cowling.  The left rear 

baffle fits well with #4 cylinder baffle which means the #4 cylinder 

baffle is too short too.  I've known for a long time that the #4 

cylinder baffle is made 3/8 of an inch too tall where it overlaps the 

#2 cylinder baffle, but always figured it was the right height along 

the aft edge where it joins the left rear baffle.  If you look at the 

left rear baffle on a Tiger, you can see it is about 1/2 inch too high 

compared to the #4 cylinder baffle.  There is a serious mismatch in 

this corner.  The left rear baffle on a Tiger is the right height.  The 

left rear baffle on a Cheetah is too short.  The #4 cylinder baffle is 

just totally wrong - for either installation.  What's really 

interesting is, I have the blue print and the baffles are made to the 

blue print.  Conclusion: the original baffles were poorly designed or 

not designed at all, just installed as quickly and cheaply as possible. 

I have about 80 hours in fitting the baffles to my new cowling.



  - - - - Oh, and, by-the-way, The structural analysis is complete on 

the cowling.  Facter of safety is 1.7 to 1.9 . . . . . . about the same 

as the Saturn V that went to the moon.  To the moon, Alice.  (OK, so, 

who knows where that comes from?)



ps, the report for the FAA was about 25 dollars per page.

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Gary
AuCountry Aviation
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Posted: Mon Jan 22, 2007 2:54 pm Post subject: Baffles

Could this be that the rear Baffles for the early  AA5 and 75AA5 and A's are almost one and the same. I have two new R/H rear  baffles that the P/N's one them say one is a AA5 the other AA5A the only  difference being one small extra hole and the different profiles of the  flexible baffles.

  

 Ian

 MatAir

  

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GrummanDude

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

Posted: Mon Jan 22, 2007 11:52 pm Post subject: Baffles

There is no doubt they reused the same pieces for different shaped 

cowlings.  I mean, why would anyone expect anything else?



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AuCountry Aviation
Home of Team Grumman

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