Make your own free website on Tripod.com
The Long EZ
THE CENTER SECTION SPAR
Home
LONG EZ BACKGROUND
FUSELAGE
THE PANEL
CANOPY
STRAKES
LANDING GEAR
THE CENTER SECTION SPAR
WINGS
CANARD
ENGINE
LINKS
SWAG SECTION

The center section spar passes through the fuselage just forward of the firewall.  It provides a method for attaching the wings to the airframe and also the structual support for the motor mount.

spar18.jpg

To begin the spar a two sided jig is built  from particle board.  Then a foam box is built in the jig.  You are left with a rectangular foam box outlining the shape of the spar.

333331-r1-5.jpg

 
 
To the right is the spar as it is  ready to receive the spar cap.  The spar is laying forward face to the left in this picture.  The depression on the top face is for the spar cap.  The spar cap is a 3 inch wide layup of  unidirectional tape.  It is about 1/2 inch thick at the center and tapers smaller towards to the end sections.  Aluminum inserts and extra glass layups are also added in the aft face for the hardpoints to attach the bolts which hold the wing to the spar.  The spar then receives additional layups around the entire exterior.  A hole is then cut in the forward face to provide a baggage space behind the rear passenger seat and also provide access to the inboard wing attach bolts. (See bottom photo)

333331-r1-7.jpg

To the left is the spar on the table with the forward face down.  The shear web has been applied and peel ply placed over the entire web.  The shear web is a lay up which ties the upper and lower spar caps together.
 
 
 
 
 
 
Below is a picture of the spar being bonded to the fuselage.  After being placed into the space between the longerons, it is "squared" in three axis; level, sweep and incidence, (whether the forward face is perfectly vertical ).  Once shimmed into place, BID layers and peel ply  are added for cure.

sparattach.jpg