Ambrosini SAI Super S7 (oz16067)

About this Plan

Ambrosini SAI Super S7. Free flight scale model for rubber power. Wingspan 24 in.

Direct submission to Outerzone.

Quote: "AMBROSINI SAI SUPERSETTE S-7 24” SPAN DRAWN 15 MAR 2013.

WING CONSTRUCTION: Layout the leading edge and trailing edge on the covered plan first. I never pin through the balsa but use pins on each side or use scraps of balsa and stick the pin through the scraps and stick the parts down. Once the Leading Edge (L.E.) and Trailing Edge (T.E.) are in place I use 1/16” sq balsa for the bottom of the rib, gluing them in place between the L.E. and T.E. Once these have dried , add the spars. I measure the high point between the high point of the airfoil and then taper the spar from this to the wingtip size (1/16”). Once the spars are glued and pinned in place to dry. Add the upper rib by using 1/16” sq strips for the upper part of the rib. Lay the strip against the L.E. as it rests on the main spar. Pin the rib L.E. to the wing L.E. with glue and gently bend the strip over the spar and bring it down to the wing T.E. and trim to fit tightly to the T.E. Then repeat for each rib. This is a quick and easy way to build strong and light ribs. Once these ribs are in place you can add 2 turbulator strip (1/16”sq) between the L.E. and the front spar which make the airfoil more rounded in the front. The wingtips are laminated from 1/13”x1/16” strips using 3 strips.

EMPENNAGE: These surfaces are built flat on the plan using the designated sizes of balsa strips . Pretty standary building construction.

FUSELAGE: The fuselage is built using the box style construction. Build the first side over the plans and once this has been built and has dried, build the second side of the fuselage box right over the first side. You can use saranwrap of etc. to cover the first side to keep them from sticking together. Remember good, strait, tight joints is important. This type of joint uses less glue and is very strong. Once the sides are dry start bring the sides together starting in the middle of the fuselage and once these are joined and pinned in place gently draw the tail sections together adding crossmembers. Using 90 degree triangles to keep the sides vertical.

Regards,
Tom Akery/Sky9pilot"

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