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Building Tips and technical articles. => Building techniques => Topic started by: Albert Kraus on October 14, 2006, 12:55:10 PM

Title: Double taper wing
Post by: Albert Kraus on October 14, 2006, 12:55:10 PM

I need help, been building many years wings on a jig but this one has me stumped
center section built no problems. Wing tips are 18 in long double taper thickness
from 2 in to 1 in.  What is the best way to build this section of the wing without building
a warp into it. Cant use jig that is the problem.

    thanks Albert Kraus
                MAAC 4381-L

Title: Re: Double taper wing
Post by: Albert Kraus on October 14, 2006, 05:46:01 PM

Maybe should have been a little more clear. I have an adjusto jig tip rib is too small for the rods, the leading edge tapers back the trailing edge sweeps forward. The plane is Don Hutchsons Dauntless SBD 5  also the tip has dihedral .Just have to build it with no warps. hopefully

Title: Re: Double taper wing
Post by: Ron King on October 16, 2006, 03:09:33 PM

For something that short and small, I would simply shim up the spars. As Ty mentioned, the LE and TE will remain on the same plane.

Draw a center line on the root rib and the tip rib. Then shim the spar so the tip rib is level with the root and that will work. I also cut a piece of balsa to sit under the TE of the ribs. They are very weak (usually) until you get the TE and some sheeting installed. The TE shim will be a constant height.

Hope this helps,

Ron

Title: Re: Double taper wing
Post by: Derek Moran on October 17, 2006, 08:27:32 PM

This is how I solved the problem of double taper wings.  You may not have the same freedom since I designed the structure and the fixture together.  Nevertheless, there may be an idea or two you can glean from these pictures.
Derek