Viking (oz9846)

About this Plan

Viking. Radio control sport model. Eri Berglund's contest winning VIKING (single channel) design from the late 50's. Wingspan 60in. Kitted by the Swedish company SEMO.

Quote: "BUILDING AND FLYING the "VIKING" RADIO CONTROL MODEL. Designed by Erik Berglund.

The VIKING has been specially designed for advanced R/C flying and has already dominated contests in Sweden with three National and one European Championship to its credit to date. It is definitely NOT a learners or beginners model, though construction has been kept very simple and most of the kit is prefabricated for quick yet rugged assembly. Flying is easy, but remember that the VIKING is a fully aerobatic model and is therefore sensitive and quick to respond to your commands.

As in all low wing models the secret of stability lies in the 'wash out' of the wings, in this case from 0° at the root to 7-1/2° at the tip ribs. Before building study the plans and instructions carefully, and get to know every part, where it goes, and how it fits in relation to the other parts.

MAIN PLANE: Cover plan with tracing paper or waxed paper, and secure to building board. Notch out trailing edge to accept ribs and pin in place together with 4 x 8mm bottom main spars. Enlarge rib slots near centre section to allow for 1.5mm ply diheadral braces, and cement ribs in place. Next cement on leading edge. When dry remove from board, turn plan over and build left wing half to same stage.

Replace right half wing on plan and pin down leading edge also root rib. Set wash out by placing a 20mm block under tip of trailing edge. Now cement in top main spar (4 x 8mm) and all triangular gussets and fillits. Top side of leading edge can now be sheeted also tip outer panel leaving it over length to be trimmed to shape after shaping and fixing underside diagonal outboard rib cut from 5mm sheet balsa. Repeat procedure for left wing half. Next construct centre section using precut 'block' ribs and setting in ply diheadral braces. Ply should be pre-cemented over entire length before use.

With centre section secured to board fit wing halves ensuring correct diheadral angle (4 in under leading edge), and chocking trailing edge to maintain correct washout. When thoroughly dry sheet underside of leading edges with balsa and cover centre section both sides with pre-cut ply panels again ensuring washout maintained by chocks whilst covering and drying. Do not omit U/C locating stops made from 3mm ply which are pre-cemented and cemented in front of lower main spar and against 'block' ribs. These should be reinforced with a balsa spreader also well cemented to bottom front main spar. Finally shape up tips, and sandpaper all over prior to covering..."

Update 03/05/2018: Added kit instructions, thanks to Optimate, bem.

Supplementary file notes

Page from SEMO catalogue, showing RC Viking spec and photos.
Kit instructions, in English.

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