PZL Wilga 35 (oz789)

 

PZL Wilga 35 (oz789) by P Hayward from Aeromodeller 1973 - plan thumbnail

About this Plan

PZL Wilga 35. Scale model glider tug. Free flight for .5 - .75 cc engines. Scale is 1/12.

Quote: "THE AIRCRAFT pictured on these pages is in fact the second such model made - the original having met an unfortunate end under the wheels of a van at the 1970 Nats, without ever having become airborne. We must all be aware that whilst there is not always an official speed limit at rallies sited on airfields, commonsense should prevail. If the driver had been travelling at a reasonable pace the unfortunate incident could have been avoided. As it was, one model was reduced to matchwood in one second flat - not a fitting finish to several months' careful work.

A second version was built, once again scaled from the Aero Modeller scale drawings (plan pack No. 2910, price 35p.) At 1/12th scale, with a wing span of slightly over 3 ft and powered by a DC Dart, I was still convinced that it would make a beautiful model, and moreover a lovely flyer. The fruits of labour were not in vain, the Wilga proved to be everything I had hoped it would be! When trimmed out, the flight pattern proved to be a steep left hand climb followed by a gentle left hand glide. Flown straight off the board (as the saying goes), apart from slight packing under the tailplane to increase eleva-tion, the model flew in very tight circles, but it was felt safer to open out the turn as the tendency for the nose to drop is always there.

Careful selection of woods is a must if the weight is to be kept down, while fuselage construction with any-thing but very soft wood will prove difficult. Basically easy to build, the fuselage construction is unusual and the following notes on construction might prove helpful, Firstly, the fuselage main formers are cut out, laminating where necessary, and adding the reinforcing sections for gluing, etc. Sew and epoxy the undercarriage, after bending from 14 swg, to the rear of former C. Basic assembly is a hand held affair, so careful alignment is a must. The various components key together, and if cut accurately the assembly will be self-supporting. The builder can then decide how far to take the assembly in one go - the isometric sketch shown on the plan reveals the fuselage construction clearly. Once the basic assembly is completed the k in. square stringers are added and the top rear longeron fitted and glued. If the nose of the fuselage is placed on the edge of a table or building board, the engine bearers and front former can be carefully checked for alignment, which is naturally most important.

Completion of the undercarriage is next; the forward cross pieces being soldered to the main legs and then once more stitched and epoxied to the fuselage. Fuselage sheeting must be undertaken in two halves, each half overlapping the keel and top spine. The cabin area is sheet covered completely and then when the glue is dry, the glazed areas are cut out. Centre section wing ribs are keyed onto former C and the incidence angle must be checked with extreme care, as well as making sure that all is square. Brass tubes for wing retention are epoxied into position followed by all necessary sheeting to complete the assembly. It is worth mentioning that the two hardwood dowels at the rear of the cabin window are important and most necessary for rigidity in this area. Block balsa is used to fair-in the extreme rear fuselage once the rear wheel assembly is completed and installed.

Cowling construction is from 1/2in strips of balsa assembled around a suitably sized and tapered receptacle—a plastic beaker being ideal. The inside front face must be built up to facilitate the sharp taper at the bottom..."

Update 26/07/2016: article pages, text & pics added, thanks to RFJ.

Supplementary file notes

Article pages, text & pics.

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PZL Wilga 35 (oz789) by P Hayward from Aeromodeller 1973 - model pic

Datafile:

ScaleType:
  • PZL-104_Wilga | help
    see Wikipedia | search Outerzone


    ScaleType: This (oz789) is a scale plan. Where possible we link scale plans to Wikipedia, using a text string called ScaleType.

    If we got this right, you now have a couple of direct links (above) to 1. see the Wikipedia page, and 2. search Oz for more plans of this type. If we didn't, then see below.


    Notes:
    ScaleType is formed from the last part of the Wikipedia page address, which here is https://en.wikipedia.org/wiki/PZL-104_Wilga
    Wikipedia page addresses may well change over time.
    For more obscure types, there currently will be no Wiki page found. We tag these cases as ScaleType = NotFound. These will change over time.
    Corrections? Use the correction form to tell us the new/better ScaleType link we should be using. Thanks.

PZL Wilga 35 (oz789) by P Hayward from Aeromodeller 1973 - pic 003.jpg
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PZL Wilga 35 (oz789) by P Hayward from Aeromodeller 1973 - pic 004.jpg
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PZL Wilga 35 (oz789) by P Hayward from Aeromodeller 1973 - pic 005.jpg
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