Curare 60 (oz14986)

 

Curare 60 (oz14986) by Hans Prettner, Hanno Prettner 1976 - plan thumbnail

About this Plan

Curare 60. Radio control pattern plane. For .60 emgine.

Note this here is the Curare as it appeared in MAN, Dec 1976. For the kit version, with a balsa built-up wing, see Curare 60 (oz5527) from MK.

Quote: "The Curare that won the 1975 Tournament of Champions and the $10,000 award. BY HANS AND HANNA PRETTNER. Continuing MAN's philosophy of the best we present the efforts of this famous father/son team who have made a career of winning most, if not all, pattern championships!

We feel that the ultimate model design for international R/C aeromodeling competitions is the Curare. An extensive amount of research and testing has been accomplished over the last few years to develop the Curare design into what it now is. Our previous design Super Sicroly II (oz9817) is the basis of the Curare. Several design parameters of the Sicroly design have been retained, notably the elegance with which maneuvers can be performed. The Curare features improved crosswind performance and extreme smoothness in gusty high wind conditions. There is very little difference flying the Curare in windy or calm conditions. A pilot can fly the model through the FAI program or any other combination of maneuvers and not have to worry about correcting every maneuver, leaving time to perform exact maneuvers.

My answer to exact flying is straightforward. A pilot can only achieve round symmetrical figures when he can concentrate fully on performing the maneuver and not on correcting for aerodynamic errors just to be able to complete the maneuver. The result is not a compromise, but is a Curare!

This assurance is established by our many wins and top placing in world championships and international competitions from Las Vegas to the European meetings.

The Curare (Curare is a poison used by the South American Indians on their arrow tips) in the hands of a top flyer is a fast piece of quite wonderful ammunition. Equipped with a Webra 61 Speed and Webra's tuned pipe silencer system very high speeds can be obtained with a low noise level of 78 db. A Simprop 7 channel contest radio is used because very high performance is required as well as three additional channels. Extra functions are retractable landing gears (MK type), combination dive brakes and flaps, and mixture control plus wheel brakes.

Retractable landing gears should be used in order to obtain full advantage of the aerodynamic qualities of the Curare. Also highly desirable is the combination dive brakes and landing flaps as shown on the plans. The excellent low speed performance of the Curare is further improved with the flaps. This is very important when flying off grass strips so the touch down speed is at a minimum to reduce any possibility of damaging the retractable landing gear mechanism. The flaps also stabilize low speed flight.

A new wing and stabilizer airfoil is utilized as well as a new idea in stabilizer dihedral. We are always being asked about the negative (anhederal) dihedral in the stabilizer. Many tests were performed to perfect the new design concept. It was found that the airfoil of the stabilizer was very critical otherwise opposite results were obtained. Wind tunnel tests showed that optimum stability under every weather condition could be obtained with the new system. Optimum low and high speed performance are now obtained..."

Direct submission to Outerzone.

Supplementary file notes

Article, thanks to RFJ.

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Curare 60 (oz14986) by Hans Prettner, Hanno Prettner 1976 - model pic

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