Building the Inner fuselage
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Building the Inner fuselage

Building the inner fuselage sides is another task that is not very difficult. It is often simply a matter of measuring carefully. Should these pieces not be attached identically to each fuselage, then then the formers will not be square to the centerline when the fuselage sides are aligned.

  • The forward fuselage doubler is cut from 1/64" plywood. The wing saddle area on the doubler is left oversize and will be sanded to final shape after the doubler is glued to the fuselage side. It is a good idea to use epoxy glue as this will minimize any warping which may take place.
  • After the doubler is positioned, you can use a piece of waxed paper over it and a weight can be placed over it until the glue is fully dry.
  • Once the wing saddle area has been shaped, former positions can be transferred to the inside of the doubler.
  • A straight-edge should be used to align the longerons inside the fuselage. This will help with alignment later and minimize any additional sanding
  • As mentioned in the article on laying out the fuselage, vertical supports are used to prevent the fuselage sides from warping.
  • After gluing the longerons in place they should be weighted down and allowed to dry.
  • The fuselage sides should then be taped back together and block sanded to an exact match. If you have taken careful measurement and worked accurately during assembly, there should be a minimum of sanding needed.
  • The fuselage is then jigged up on the board so that the bevel can be marked at the tail post to bring the fuselage sides together. The first step in this process is to determine how thick the fuselage should be at the tail and mark half that measurement on each fuselage side from the outside.
  • The fuselage side is then trimmed to the line shown. The line is drawn on one side only. The sides should then be laid next to each other and the line is extended across the inside. Both sides are then sanded up to the line.

Next Article: Preparing the formers

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