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Johns Web Site
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Date: 10-5-2016
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Number of Hours: 4.00
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Manual Reference:
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Brief Description: Access Door
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Today, the cowl hinge was clecoed in place and checked for clearance through its operating range. There was no apparent problem.
I am hoping to use a single Hartwell H-5000-2 latch in the center bottom of the door. However, the cowling is only about 0.040” thick in this area; leaving the door more flexible than is needed to ensure that the corners of the door won’t lift from the negative pressure this area will see in flight.
To overcome this likely problem, I am stiffening the door by adding three layers of fiberglass and one layer of carbon fiber to the back side of the door. After the lamination was completed, it was covered with a layer of Peel Ply followed by a layer of polyester batting, then placed in a vacuum bag and sealed. The vacuum pump was turned on, and after checking for any significant leaks, the door was inverted and propped up on two pieces of wood at the fore and aft edges, and a rubber sanding block was placed in the center of the lower edge of the door.
The wood blocks and rubber sanding block are forcing the lower edge of the door into a slight bow while the epoxy cures, with the fore and aft edges slightly lower than the center. In this configuration, when the door is closed and the lower center is forced down against the backer plate by the latch, the fore and aft corners will be predisposed to lay tightly against the backer plate also. Hope it works. If not, two latches will be used.
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Front View of the Access Door Hinge in the Open Position
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View From the Right Side
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Vacuum Bagging the Door
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