Zlin Akrobat (oz11080)


Zlin Akrobat (oz11080) by Ray Borden 1971 - plan thumbnail

About this Plan

Zlin Akrobat. Profile controline sport model.

Quote: "Profile Scale Stunter for fun and games - outstanding full scale aerobatic plane is an excellent subject for simple but effective Stunter for both beginner and contest man. Zlin Akrobat Stunter, by Ray Borden.

How many modelers are 'retreads'? Many, it would seem. Visit any flying field and you hear tales of time-off for school, the military, family problems, etc. The point is, once the bug bites hard it leaves a virus that is difficult to shake for long.

This modeler went the route, Air force, family, even about ten years' worth of assorted auto racing. By the way, if you think modeling is expensive, try steel and rubber prices instead of balsa and dope. Modeling prices are no higher than those of any other hobby and the quality and variety of products is higher than those offered for many other pastimes.

Price is a factor, though, and any hobby is as expensive as you make it. To a reborn modeler, the modern variety of types and classes poses quite a selection problem. Free Flight, an old favorite, was out because of local urbanization. Radio is interesting, of course, but a bit high in price for oiling very rusty building skills. Buying the mags and checking the local flying sites indicated that C/L should be an ideal place for a 're-start.'

Some memory jogging advice from Dick Sarpolus, well known East Coast modeler, and a couple of .09 powered trainers resulted. These did the trick, and soon we were hunting for something with which to learn some sort of Stunt Pattern. It should have flaps but be easy to build because it would probably have to be rebuilt again and again. Profiles are quick, easy to build, and ideal for use as a trainer. Even a profile should 'look like somethin', though.

OK, what? Since we were looking for aerobatic results, perhaps the ship should resemble some full scale hot-shot. The C/L skies are full of WWII fighters in profile, so why not attempt a semi-scale of a full size aerobatic type? Spinks, Yak, Zlin, Chipmunk and many more 'greats' create a selection problem. A solution was found when a quick search for three-views uncovered those of the Zlin done by LG Halls and published in MAN's December 1969 issue.

[Note: for a copy of this 3-view drawing, see the supplement article file at Zlin Akrobat (oz10885) which includes those 2 pages].

The color scheme could be from published pictures, the Halls three-view, as we decided, or who's to say a fellow couldn't dream a bit and fly with his own colors?

The result of the finished project was a very satisfying machine. It goes to-gether quickly and looks quite good in the air. The first flight resulted in inside and outside loops, the second included inverted flight, and by the third, the ancient test pilot was doing the complete Stunt pattern (1949 variety, of course. As soon as the knees quit knocking we'll move on to tackle some modern antics).

Before building, it might be well to mention a couple of items about the ship that the builder might like to vary. The first is the flaps - they complicate the building somewhat and may not be desired by some builders; in fact with the flaps glued in solid and the pushrod going directly to the elevator and ad-justed for less travel, the Zlin makes an excellent primary trainer, with expansion to full flaps an option for later use. Speaking of full flaps reminds us that experienced builders may wish to run the flaps the full length of the wing. The short version shown is the result of not being familiar with the latest thinking.

The gear mounting is unusual and perhaps bears mentioning. If a tor-sional type is used on a Control Liner, the short leg at the inboard end is diffi-cult to design clear of the bellcrank area. The solution used here is simple and has proved very practical. The end tab of the torsional length is turned down instead of up into the wing and secured from either side by gear clips and through bolts. This not only simpli-fies the wing structure but lets the gear break away cleanly in the event of a 'misfortune.' If nylon gear clips are used, the break-away feature is further enhanced.

OK, let's build a Zlin. All the construction is straightforward and typical Profile style. Cut the fuselage from 1/2 in medium-hard to hard sheet..."

Zlin Akrobat, MAN, November 1971.

Direct submission to Outerzone.

Supplementary file notes

Article pages, thanks to RFJ.


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Zlin Akrobat (oz11080) by Ray Borden 1971 - model pic

  • (oz11080)
    Zlin Akrobat
    by Ray Borden
    from Model Airplane News
    November 1971 
    50in span
    Scale IC C/L
    clean :)
    all formers complete :)
    got article :)
  • Submitted: 08/04/2019
    Filesize: 768KB
    Format: • PDFbitmap
    Credit*: Circlip, RFJ
    Downloads: 1181

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Zlin Akrobat (oz11080) by Ray Borden 1971 - pic 003.jpg
Zlin Akrobat (oz11080) by Ray Borden 1971 - pic 004.jpg

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