Zlin Akrobat (oz10885)
About this Plan
Zlin Z526 AS Akrobat. Radio control scale model for .60 engines. Uses a foam wing. Scale is 1/6.
Quote: "69's top R/C scale multi winner, 1st at the Nats, 4th at the Internats with highest flight points continues MAN's policy of offering nothing but the best to our readers. Exciting winner in full scale aerobatics - equally exciting as model, it can be flown in pattern as well as in scale! Zlin Akrobat, by Maxey Hester.
The Zlin Akrobat is the ideal R/C scale model. It is true scale, 2 inch equals one foot and easy to build. The resulting configuration is such that the model flies well enough for a full pattern airplane.
When I first saw pictures of the Zlin, I felt sure that it would make an excellent flying model and still be absolutely accurate scale. The first test flight proved this theory as its flight characteristics were even better than I had hoped. After the initial test flight of WXD, I was so impressed with its performance that I started the second Zlin, WXC, that very evening.
When I first looking over the three-views, I was concerned about the narrow landing gear and expected difficulty in ground-handling. After the very first take-off I could see that there was not going to be any problems. Only a slight bit of right rudder is held on take-off. Touch-and-goes and landings are straight away and I have never had a ground loop with either plane.
The main reason in building two air-planes was that I wanted to fly in the '69 Nationals and I was already on the US R/C Scale Team to compete in the world championships at Bremen, Germany the week following the Nats. Also, with two planes I could get in more practice before both events without fear of washing out my only scale entry. As it all ended up, I still have both Zlins, OK-WXD and OK-WXC, in perfect condition. The only difference in the two airplanes is the basic color, WXD being metallic green and WXC is metallic blue. The extra practice paid off with first place at the '69 Nats.
Frequently it is very difficult to find adequate three-views and sufficient scale information on an airplane to be a truly accurate scale Model and have ample proof for scale judging. Claude McCullough obtained the three-views from a modeler in Czechoslovakia, plus several black-and-white photos, but no color photos. Hale Wallace happened to have some color slides of the Z 526 AS. There were five of the 526AS planes built for the Czechoslovakian team to compete in the full-scale world aero-batic championships. They were all a different color and the letters started with A and went through E. Factory numbers started with OK-WXA 1026 and went through OK-WXE 1030.
The basic color was white, with red and black trim. The bottom half of the fuselage, most of the bottom of the wing and the wing tip was a different color on each airplane. WXA was light metallic blue, WXB was light metallic olive, WXC was medium metallic blue, WXD medium metallic green and WXE was metallic bronze. The complex paint schemes were a little difficult to mask off but the results were well worth the extra time and trouble.
I sprayed the entire plane with Sig Supercoat white first, then masked off with tape and paper to spray the base color of blue or green. I then taped off for the black and red and brushed these colors on. I always spray on three or four coats of reduced clear over the color and rub with rubbing compound. I then put the final lustre on by using a sheepskin pad in a 1/4 in drill and fine rubbing compound.
As I said before, the ground-handling is excellent. In all of the flights I have made with the two Zlins I have never had a ground loop on take-off or landing. The main reason for this good handling is that the center-of-gravity is well forward. I placed the battery pack above the tank, then the servos.
I used a GI Joe doll for the pilot, with his body cut off just below the arms, replacing it with styrofoam in the body and foam rubber strips in the legs, with his shoes fastened to his pants legs.
I used the M-K retract gears from Royal, reworking them so they would retract straight back. A fifth channel with a separate model servo was used..."
Kitted as SIG RC-23.
Note full SIG kit instructions (20 pages) are available as a free download from https://wanderings-ds.jimdo.com/sig-rc-kits-21-40/ - includes more illustrations and scale drawings etc.
Direct submission to Outerzone.
Supplementary file notes
Article (includes 3-view drawings of the Zlin 526 A Akrobat at 1/48 scale by LG Halls, showing scheme).
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