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Builder:
  Carl Peterson
Location:
  Goodyear, AZ - USA
Aircraft:
  A QB
Total Build Hours:
  163
Web Site:
  http://www.mykitlog.com/PetersonBear/

Date:  09-27-2020
Number of Hours:  2.00
Short Description:  Enigne Cowling - Pt 14

Now that I am happy with the fabrication of the engine cowling it is time to decide on the types of fasteners I wanted to use (countersunk vs protruding) and proceed accordingly.

I decided (at least for the time being) that all fastners attaching the cowling to the airframe would be #8 protruding screws with all others being #4 solid rivets.

On my lower cowls, common to the U channel, I have a 0.125" filler strap located between the skin and the U channel which I countersunk to accept the dimples in the cowling skin. However, along the upper cowl, common to the piano hinge, the hinge is too thin to use the same technique so I was able to dimple both the upper cowling skin and the piano hinge with no trouble.

I found that dimpling both pieces together a the same time produced better results than I had when I tried to dimple them separately.

For the time being, after dimpling, these components are being held in place with #6 countersunk screws. Although these screws are not perfectly flush, they are flush enough to provide a flat surface that will allow me to form the cowling doors and obtain a tight fit.




RH lower cowl dimpled along U channel





LH lower cowl dimpled along U channel





LH upper cowl dimpled along hinge

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