Tech Questions - Inspection Rings


Please click on one of the following questions. Use your browsers back button, or click on the "back to top" button to return to the top of this page.

What are inspection rings and how are they made?

These are plastic reinforcement rings that are glued in places where you may later need access. As an example, you would want inspection access holes to inspect spars, in areas where you will be attaching wings to struts, or any area that you will need to access as you assemble the airplane. They are also located wherever you will want to gain access for inspection purposes.

Back to Top

How will I know where to place them?

There is no set rule. If you are recovering an airplane, note where the inspection holes were previously located. You may want to place them in the same areas. Otherwise, use your own judgment based on where you will need access.

Back to Top

Do they go on top or bottom of a surface?

Try to place all of them on the bottom side of all surfaces. That will be more pleasing to the eye and will not interfere with lift on the top surface of wings, etc.

Back to Top

Should I cover the inspection rings with fabric?

Definitely! Be sure to cover them with fabric otherwise they will vibrate loose and separate with time. Cut a piece of fabric in a circular form using a 1 gallon can as a template. This will provide a piece that will overlap the edges of the ring.

Back to Top

Should I use straight scissors or pinking shears to cut the patch?

Use pinking shears.

Back to Top

What weight fabric do I use?

Lightweight fabric will work best. It will lie down without wrinkles much better than other weights.

Back to Top

How do I attach the fabric patch to the ring?

Use Poly-Brush to attach the fabric patch. Coat the area over where the patch will be located and let it dry. Then go back and apply another coat of Poly-Brush and lay the fabric in place. Use your brush to work the Poly-Brush up through the fabric just as you would a finishing tape.

Back to Top

I did what you said but I now have pinked edges that are rising up. What can I do about that?

Once the Poly-Brush is dry, go over the edges with your iron set at 225 F. That will heat smooth the edges and remove any bubbles you may have in the fabric.

Back to Top

I don't understand. How will I get into the area if I am going to cover it with fabric?

After you have completely covered the airplane and sprayed the last color coat, you can then use a pencil soldering iron and melt the fabric around the ring. That will remove all of the fabric inside the ring. You then place a metal inspection plate in the hole.

Back to Top

Should I open up all of the inspection holes when I have covered the airplane?

Not necessarily. You do not have to open all of the holes until you are ready to use them. As a matter of fact, you will not open all of them immediately.

Back to Top

How will I get the color of the inspection plates to match the color of the fabric?

During the final color coats on the fabric, spray all of the inspection plates you will need for the entire airplane. Actually, you should paint a few extra. Painting them now will ensure a proper match.

Back to Top