Overlander (oz6338)

About this Plan

Overlander. 6 ft wingspan free flight power model by A Anastasiou, from Aeromodeller August 1948.

Quote: "This model was designed for both contest and sport flying. On the first day out it took fourth place in the Brentford and Chiswick Gala for Croyden and since that day has made approximately 400 flights without damage.

Build the two sides first, joining them in the usual way, leaving one longeron longer than the rest at the nose. Take a piece of 1/8 sheet balsa, cut to shape of pylon and cement into position on fuselage. Cut out formers, cement to fuselage and side of pylon. Cut 1/8 sheet balsa, lay on top of formers to form wing mount.

Cut out four pieces of 1/16 ply to fit in between front lower spacers, then drill holes for aluminium tubing for undercart legs. Cut out piece of 1/16 ply for fuselage bulkhead F.1. with square cut out for rear of F2. Cement this on nose when cut to shape and cement C1 on, then cut out C2, fix ,in place, make battery box and fix coil, flight timer, and booster leads in place, with all wires going down fuselage and out of space cut in F1.

Fix wing attachment hooks in place, also under fin, and the sheet front section of fuselage. Before sheeting mark position of battery, coil and flight timer inspection hatches. Sheet inside of cabin and continue sheet out to C1 - sand-sheet down well. (The curve of the pylon is not hard to shape.) Cement celluloid round cabin.

Wings: Cut wing spars from 1/4 in sheet balsa (trailing edge medium hard). Cut out ribs from 1/16 sheet balsa and two from 1/4 in sheet. Pin down trailing edge; the leading of the rear trailing edge must be raised 3/32 in. Cement ribs with leading edge in place, drop spars in and make sure the root 1/4 in sheet ribs are at the correct angle, and hooks 1, 2 and 3 for rubber hands.

Sheet and cap wings. When the latter are set, sand all over and then lay wings upside down so that the centre sections are flat. Brush glue on sheet where webbing is to be placed. Press webbing down and pus.h drawing pins through webbing into sheet - leave to dry for several hours.

Tailplane. Reinforce centre-rib with thin celluloid sheet and cap top of tailplane only.

Fin. Cut out ribs from medium soft 1/16 sheet, slide ribs on to 3/16 dowel and 1/4 in spar. Cement leading edge into place - add two-piece trailing edge. Cap ribs. The bottom rib being capped with 1/16 sheet, with the shape of the top camber of tailplane.

Flying. Test for glide down a slope if possible, when correct glide is obtained start motor up to about half throttle and launch into wind with about 10 sec motor run - it should turn gently to the right. When model is trimmed it should have a gentle right-hand power flight and glide."

Direct submission to Outerzone.

Supplementary file notes

Planfile includes article.

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