Offspring (oz12415)

 

Offspring (oz12415) by Ron Roberti from Model Builder 1977 - plan thumbnail

About this Plan

Offspring. A/1 Nordic competition glider model. wingspan 58-1/2 in, wing area 276 sq in.

Quote: "Your best chance of winning is with a clean, functional design, such as this one. Even if you don't decide to build it, the wing construction method is worth close study.

After seeing the results of my Pink Lady A-2 Nordic, I wondered if a smaller version of the same airplane would work as well. So to the drawing board I went and thus was born the 'Offspring.' An excellent all sheet covered version of my A-2, although heavier than the minimum weight required, its performance is excellent, especially on the towline where many A-1 gliders have most of their trouble. It's a real good contest airplane, easy to build and fly. Try it, you'll like it!

Before you start, read the text carefully. By doing so, you'll save yourself some trouble, as you will see. Wood selection is most important to keep the weight down as much as possible.

Start the fuselage by cutting the main center piece of 1/4 inch plywood, from the template on the plans. This will be the main strength, timer mount, wing mount, tow hook mount, and mount for the ballast box. Cut out two sides of 3/8 medium hard sheet and glue one on each side of the plywood. Do not cut lower notch on side pieces, as the tow hook will fit in the slot and mount to the plywood center piece. Now cut two sides of 1/4 inch sheet medium hard, eliminating both top and bottom notches. Glue these two pieces, one on each side and let dry. I suggest using Titebond cement for strength. After this is dry, insert the fiberglas fishing rod, making sure that the top is parallel with the center line. Plans show this. This is to make sure that when the stab mounts are put on, you do not build in any incidence setting.

At this time, we can drill the holes for the wing-mount wires. This must be done on a flat surface, using a drill press for accuracy. The main support wire is 1/8 0D, so you will have to drill a hole to accommodate a piece of 1/8 ID brass tubing. The forward wire is 3/32, so you will have to drill a hole to accommodate a piece of 3/32 ID brass tubing. Before drilling, mark the holes by using the wing rib template. Lay it flat on the side of the fuselage and set it so you have 3° of positive incidence in the wing. Locate the center of the rib, and mark where the holes are to be drilled..."

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Offspring (oz12415) by Ron Roberti from Model Builder 1977 - model pic

Datafile:
  • (oz12415)
    Offspring
    by Ron Roberti
    from Model Builder
    February 1977 
    58in span
    Glider F/F
    all formers complete :)
    got article :)
  • Submitted: 29/07/2020
    Filesize: 522KB
    Format: • PDFbitmap
    Credit*: MB2020

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