KZ III Lark (oz1729)


KZ III Lark (oz1729) by JA Fleming 1961 - plan thumbnail

About this Plan

KZ Lark (KZIII). Scale rubber model of Danish light plane. November 1961 Aeromodeller.

Quote: "Build yourself a 19-1/2inch span, rubber-driven flying scale model of the Danish KZ Lark. Designed by JA Fleming.

This 19-1/2 inch span model was built to provide information for the design of a 1/8th scale diesel-powered version and with a larger than scale tailplane flies quite well. The original KZ III Lark was produced in Denmark in 1947 and has generally better lines than the majority of modern light aircraft.

It was described in AERO-MODELLER for November 1952, which contained a 1/72 scale drawing. The following details will be of interest: Spanning 31 feet 6 inches it is 21 feet 7 inches long and cruises at 106 mph. Full load take off run of this two-seater is 77 yards with a landing run of 55 yards.

Now for the model. All parts are from 1/16 inch balsa with the exception of the 1/32-inch sheet nose covering and laminated balsa nose. Fuselage sides are built first (outlined in tint on the plan) from hard 1/16-inch square. Note the integral mount for the tailplane and rear motor peg. While both sides dry, the fin and rudder and tail-plane are cut out and the wing commenced.

Wing trailing edge is one strip of 3/8 x 1/16-inch and the mainspar a strip of 1/8 inch square. Pin these and the 3/16 x 1/16 inch leading edges in place and add ribs and wing tips. When dry, remove from the plan and add 1/8 inch spacers for the wing struts, crack along the centre line and add the dihedral brace. Note the diagonal strips of 1/16-inch square between ribs R2 and R1. Cover with coloured tissue of your choice, waterspray and dope before adding to the fuselage.

Now remove fuselage sides from the plan and the only difficult part in the construction will be the sharp curve in the sides from F3 to F1. Steam from a kettle will assist here. Only four formers are necessary, with fairings for the top, bottom and sides. Ensure that F3 to which the 18 S.W.G. undercarriage is sewn, is of hard balsa. The dotted lines on F3 are cut away when the fuselage is complete. With F3 and F4 in place, add the cabin roof and the remaining top, bottom and side formers.

Now cut away the dotted line on F3 and cement in place the tailplane, fin and rudder. Cement the wing in place and add 1/16-inch square fuselage stringers. The top fuselage stringer ends at the point on R1 where diagonals join. Side stringers are faired at the front into the basic fuselage side and at the rear end at the leading edge of the tailplane..."

Update 19/12/2016: added article, thanks to RFJ.

Supplementary file notes



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KZ III Lark (oz1729) by JA Fleming 1961 - model pic


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