Wren (oz1568)

About this Plan

Wren. Sports cabin free flight power model. Christmas edition of Aeromodeller, 1948.

Quote: "Over eighty flights have so far been made with this model and no damage has been sustained whatever - even to a propeller. It has 'landed' in trees on two occasions, quite unharmed. Even in high winds it can be taken out with confidence as it is very stable and docile to handle. If you want a power model that will keep the repair equipment in the tool box the Wren will give full measure of flying hours

Fuselage. Begin the fuselage by tracing the side outline on to 1/16 inch sheet deleting the curved decking immediately behind the top of former C above the 1 mm ply stiffener. Cement the 1/8 inch square longerons and bracing struts where indicated. Cut out and attach the two 1 mm ply stiffeners to the inside of each fuselage side with Durofix. When set, drill the lower one. Connect the two sides by cementing in position the two formers D and E, then cement the sides together at the rear end. Add the cross struts, top and bottom.

At this stage fit and cement paper tube for the undercarriage rubber band and beneath it the 3/16 x 1/4 inch balsa support. The rear undercarriage attachment brass tube is now pushed into position and a piece of wire soldered to each end to prevent it from sliding out. No other fixing is necessary.

Cut out the formers A, B and C, and Durofix B and C together. Ensure that A aligns accurately on the front of B when the locating piece is screwed in position. A good fit is necessary here. Bend and screw in position the wire retain-ing hooks on each side of the rear of former B. File the ends of the screws where they protrude. Solder the two ends of the wire as shewn. Durofix front former accurately to the fuselage.

Sheet in remainder of fuselage and also the wing platform between the top of formers D and E. Note that fuselage bottom sheet ends midway along the paper tube support and an insert of 1/16 inch ply completes the underside to the front. Drill holes for the rear wing dowel and tailplane dowel - do not fit them yet. Cement front wing dowel and balsa fairing.

Knock-Off Engine Mount. Glue the two bearers into the slots cut in former A using Croid or similar glue. Glue and screw the 1/16 inch ply side webs and check with a square before putting aside to set. Mark out and drill the bearers to the dimensions shewn on the plan..."

Supplementary file notes

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