I also decided to invest a few hours in assembling a jig to assist me in all the critical stages of assembly of a F3A model. Believe me guys it is worth it spending some time here. A straight model requires a lot less effort to fly.

The jig consists of MDF 16mm for the surface and 2.5in x 1in for the rails. Everything was screwed together with tek screws. I also used a 1metre length of 1/4in threaded rod as well as a stock of 1/4 in nuts and washers.


The jig holds everything in place and postions the fuse level so that the wings and tailplane can be postioned precisely. The use of threaded rods gives you infinite adjustment in getting the fuse level. I am wrapped with the results.

The idea is to get this jig perfectly flat. I then take all measurements from here. You will see that I used threaded cup head bolts at the feet. I tapped 1/4in holes in the rails so now I can screw or unscrew the bolts to raise or lower the jig. I used 6 bolts in this case.

When everything is level I use this device for scribing lines along the fuse. I simply put an exacto knife in it to scribe super fine lines. When it comes to designing paint schemes I replace the knife with a soft pencil to drwa perfectly straight and symentrical lines on the fuse. I simply run this device also the smooth surface of my jig.


Hope this helps some of you.