Tyra - Rubber duration model. Plan shows both Coupe and Open variants.
Quote: "Two plans in one! Build the open or coupe d'hiver version with the same wing and tail. A top con-test design suitable for the novice...
39 inch wingspan rubber powered duration model of simple construction. Designed by Shirley and Bill Horton...
THESE dual designs are those used by Shirley Horton. The Open version came first in 1964, and was used in that year in her first attempt at the Women's Cup where it was placed 2nd. For the remainder of the season 'Tyra' was flown in Area events. In 1965, along with another reserve, Tyra won the Women's Cup for Shirley and also took top place in the SE Area RAFA Shield competition, which is flown over three rounds against all the male opposition in the area...
Being compact, Tyra is quite strong. The advantages of this are that it will be durable and easy to handle, which among other things are some of the points that the newcomer to contest flying should be seeking. The rugged yet light structure allows this model to be flown in strong winds (which usually seems to be the case on contest days) where the larger more fragile type of models can be prone to damage. It is only by continuing to fly in all weather conditions that you will rack up those vital minutes and seconds to win a contest, and Tyra is not the type you'll want to keep tucked away in the box.
It would seem that the biggest obstacle for the new-comer in rubber model flying is the business of carving a suitable propeller. The carving problem is eliminated in this design by forming the prop over a 6in diameter can. Cut out two blades from soft 4in sheet (for the Open model) to the shape shown. Mark out the centre line with a ball pen at the tip and root. Then glue both blades together using PVA glue. Now place the blades onto a 6in diameter can skewed at an angle of 15 deg from the vertical (use template as shown). Hold in place with strips of Sellotape across the blade and onto the can and leave for 24 hours to set...."
Tyra, Aeromodeller, July 1967.
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Article pages, thanks to RFJ.
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