Wagtail (oz8779)

 

Wagtail (oz8779) by Kim Jones 1994 - plan thumbnail

About this Plan

Wagtail. Control line sport model.

Quote: "An ideal control line aerobatic model for sport and contest flying, designed by Kim Jones

The Wagtail is a design which evolved out of necessity, the mother of all invention, and has proved to be a reliable and good performer. It has been flown at many stunt competitions over the last four or five years, combining a respectable record of scores with a distinctive appearance compared to the modern style of control line aerobatic model.

Wagtail is not a top notch, 'state of the art' competition model requiring high tech materials and complex construction. It is a lightweight, one-piece stunt model with a performance that should please the sports flyers, yet is capable of being a serious contender at any club competition. It is designed around the evergreen .35 cu in size of glow motor, most of which can be used straight out of the box.

Background: The Wagtail in its present form has been around for some time but its origins go back about ten years. The real impetus was some trouble I was experiencing with a sidewinder profile model and I wanted to return to a more consistent upright engine. I dismissed an inverted installation as I often practice on my own and did not like the idea of trying to hold a model upside clown and starting it by myself.

I had all the templates and jigging bits to build a wing. So a wing from the prate job and a built-up fuselage became the basis, A fuselage mounted undercarriage was a decision based on simplicity and the fact that my club's regular practice site was a playing field. The final touch in the design concept was the cockpit. There has to be a cockpit. I do like to see miniature aeroplanes doing their stuff. And by the way, if there is a cockpit there has to be an occupant! After some preliminary sketches the overall
effect was a reasonable representation of a 1930's style sporting light aircraft.

Mk I turned out quite light, and after a couple of seasons of flying it was cracking up with fatigue. The design was obviously on the weak side of 'just strong enough', so a new version was made with a beefed up fuselage and a tapered wing. This is Mk II which is the model presented here. The tapered wing was designed from scratch using Detroiter principles but with double spacing between ribs plus sheeted leading edge and cap strips. That sheeting and the full depth spar form a classic ID' box. Very strong and very rigid - but it must be built straight to start with. Built in warps are built in! Construction is relatively straightforward. However there are a few points worthy of further emphasis and clarification... "

Steve / Mary, This is the Wagtail designed by Kim Jones. It is a 50in span aircraft for a .29 - .35 engine. George

Direct submission to Outerzone.

Supplementary file notes

Article pages.

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Wagtail (oz8779) by Kim Jones 1994 - model pic

Datafile:
  • (oz8779)
    Wagtail
    by Kim Jones
    from Aeromodeller (ref:1744)
    April 1994 
    50in span
    IC C/L
    clean :)
    all formers complete :)
    got article :)
  • Submitted: 25/05/2017
    Filesize: 539KB
    Format: • PDFbitmap
    Credit*: GeorgeAlbo
    Downloads: 605

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