Tech Questions - Drain Grommets


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What in the world are drain grommets?

In a fabric covered airplane we must have some method of eliminating trapped water and moisture. This is done using drain grommets. A drain grommet is a small, round piece of plastic or metal that is placed over fabric. After all chemicals coats have been applied the drain grommet it opened up to allow moisture to escape.

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How are drain grommets attached?

They are attached using Poly-Tak fabric cement. Simply glue them in place on the trailing edges of wings, controls, etc. and the underneath side of a fuselage. Anywhere moisture can escape.

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Should I place fabric over the top of a drain grommet?

Yes, you should cut out a small piece of fabric and place it over the drain grommet using Poly-Brush to attach it.

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How can I cut a piece of fabric to fit over the grommet?

Use the inside of a roll of finishing tape as a template. Draw a circle on a smooth piece of fabric using a pencil. Cut the circle out using pinking shears.

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After the covering is complete how do I open the holes?

Get a pencil soldering iron and carefully burn through the holes. This will leave a nice clean edge. Do this after the final color coat is applied.

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Are seaplane grommets just for seaplanes?

No, you may put them on any airplane. They are larger grommets with a correspondingly large drain hole. If you are concerned about moisture accumulating within your airplane use seaplane grommets.

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What material is used to make regular grommets?

They are made out of plastic or thin aluminum. Many people prefer the thin aluminum because it covers so easily with fabric.

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