April | 2023 | Tom and Dave's Aircraft Factory

All ribs need to have a center line drawn on them for where to place skin rivets.

48 ribs, two lines per rib and Yikes! A lot of lines!

There is an EAA/Sonex Aircraft video about using a Sharpie and holding the pen with your hand.

BUT

I spent a few bucks and got a great tool!

This is called an Edge Marker Block and is available from aircraftspruce.com

One guy to hold the rib, and one guy to mark the line. Fast and easy.

Remember not to use a black pen because blue, red or green will help you be sure you got the correct mark.

FYI: Here is the EAA/ Sonex Video to do this by hand.

Blue Lining a rib for installation (brightcove.net)

Rib #9 now has the aileron bell crank in place for both left and right sides. We are currently missing the bearings so this will not be completed right now. Parts on back-order

I thought the holes were incorrectly punched but it turns out the bell crank is on different sides of the ribs for left and right. Who knew? The PLANS knew.