Nimrod (oz6891)

About this Plan

Frog Nimrod. Free flight sport cabin model, for .049 power.

Direct submission to Outerzone.

Planfile includes full build instructions.

Quote: "BUILDING INSTRUCTIONS: Read these Instructions carefully before commencing.

FUSELAGE: Remove fuselage sides from their panels using a sharp razor blade or balsa knife to cut the retaining pieces. Cement 1/8 sq strips to the sides as in FIG.1 (shown shaded on side view drawing). Make sure to build one side opposite to the other. While these are drying, bend the undercarriage wire to the shape shown on the drawing and mark its position on the ply bulkhead B4.

Drill holes where indicated in FIG.2, then bind and cement the undercarriage wire to the bulkhead using strong thread. Assemble this unit to the fuselage sides, together with bukheads B1, B2, B3, B3A and B5.

Before fixing the engine bearers, lightly spot-cement the 1 x 1-5/8 x 1/2 in block into position and carve it to shape, cutting away where necessary to clear the engine crankcase, then remove it. Drill the holes in the engine bearers and with the throttle needle remove, mount the engine on them with the 2° offset shown on the drawing. Then thoroughly cement the assembly in position.

Cement pieces F5 and F6 in position followed by the windscreen-strut cut from spare 1/8 x 3/16 strip. Chamfer the rear ends of the fuselage sides as shown on the plan view, cement together and insert bulkheads B6 and B7. Chamfer the top edge of the tail-skid F4 as shown in FIG.4 and cement in place between the bottom fuselage stringers. Drill holes in the fuselage sides and insert 1/8 dia hardwood wing and tail fixing dowels. Cement in place the 2 x 1-5/8 x 1/4 in lower cowl block, leaving an exhaust aperture behind it, and finish by sanding to shape.

Cement the ply tail-steady F7 in position and cover the rest of the fuselage with 1/16in. sheet balsa, cross-grained. Cut out the areas shown on the drawing to house the tailplane locating pieces. Finally sandpaper the whole structure smooth, trim the cabin window to fit round the wing-fixing dowels and cement this in place, starting at the centre.

WINGS: Before commencing with the construction it is advisable to lay a sheet of greaseproof paper over the drawing to prevent the cement sticking to it. Begin with the Port wing, and pin the leading and trailing edges, and the lower spar down onto the drawing. Cement ribs W1 and rib W2 in position followed by the leading edge brace W8, and the trailing edge brace W7. Cut one end of the top spar to match the angled face of the tip W4 and the other end to accommodate the Starboard top spar in a 'scarf' joint, then cement in position. Cement fillet W6 under the spar at tip, and W5 in the position shown on the drawing. Cement the two spar braces W9 in position followed by the centre rib W3 at the angle shown. When this has set remove it from the drawing and commence to build the starboard wing in the same manner.

When the starboard wing structure has set, cement the port wing to it so that with one wing flat the other wing should have 5-1/4 in dihedral at the tip. Leave the whole assembly to dry. When it is quite set, shape the leading edge as shown in the side view, and sandpaper the whole structure smooth.

TAILPLANE AND FIN. Pin the leading and trailing edges of the tailplane to the drawing and cement the ribs T1 and T2 in position as shown. Cut the ends of the spars to match the angle of the tips T3 and then cement the spar and the tips in position. When set, remove from the drawing and cement the 1/8 x 3/16 centre section brace in position. Cut the locating pieces from spare 3/32 sheet and cement in position so that they locate with the respective holes in the fuselage. Cement the two fin-halves F2 and F3 together and pin down onto a flat surface until dry. Shape the fin to the section indicated, and sandpaper both the tailplane and fin smooth. It is advisable to leave the fixing of the fin to the tailplane until they have both been covered with tissue..."

Corrections?

Did we get something wrong with these details about this plan (especially the datafile)? That happens sometimes. You can help us fix it.
Add a correction