Gee Vizz (oz8991)

About this Plan

Gee Vizz. Radio control pylon racer. For .19 power.

Quote: "A beautiful scale-like pylon racer designed for the Midwest-RCM Goodyear event. Gee Vizz by Art Williams.

NEW design and a different control system am two ingredient that very easily spell total disaster, but in this case the net result is Gee Vizz. Designed primarily as a racing type miniature aircraft to fit the basic rules for the Midwest-RCM Pylon class, proposed by Chuck Cunningham and published in the October issue ('66) of R/C Modeler, it can give you many hours of pure flying fun.

I draw, build and fly, purely for the enjoyment of it and my interest in the types of planes I have built in the past 32 years has run the full spectrum from balsa block solid models - rubber and gas powered free flights - towline gliders - U Control (how many of you can remember when it was called G-Line?), and then to R/C. I have settled down to two types of planes which are, scale and 'scale-like.' My definition of the term scale-like is not to take an existing R/C design and try to make it resemble a full scale aircraft, but rather to start from scratch and design something that could possibly be built full size. I believe that the Gee Vizz fits this category very nicely.

Rather than write the typical construction type article, I have chosen to present some of the masons how and why I designed the Gee Vizz.

Don't be alarmed, I did not forget the rudder; I used the V or butterfly tail instead. This is a Pylon racer and making pylon turns with rudder or rudder and elevator without dropping the nose is a mighty tough job; therefore, the V tail is used as elevator only, but in conjunction with ailerons. As a result of this, the plane controls like a Delta. When a bank is initiated with aileron, and up elevator is applied, the vertical surface of the V exerts a force similar to conventional up-elevator whereas the horizontal surface acts as 'top' rudder. These forces combine to tighten the turn and at the same time keep the nose from dropping.

The elevators or ruddervators are independent, but are connected to a single pushrod by a 'wish bone' type joint and can be adjusted together for elevator trim or separately for rudder trim. One word of caution here about rudder trim; for right rudder - raise the left side and lower the right side, for left rudder - reverse this procedure. Each side of the V is raised 30 degrees from the horizontal and the incidence is 0 degrees at the fuselage center-line. Follow the plan carefully because your eye can de-ceive you on setting this incidence. With only two surfaces in the tall there is less drag and subsequently more speed; also, if you are lazy like me, less to build!

The wing is tapered, or trapezoidal, in plan with an NACA 64012 full symmetrical airfoil and has a built-in twist with the root rib set at 1 degree 30' positive and the tip rib at 0 degrees incidence. This was done to counteract any tip stall which might occur, or in a tight turn a high speed stall which usually results in a snap roll - a terrible thing to happen at low altitude! The tips are designed similar to the Horner vortex tip which has been used with much success on full sized aircraft for several years. Their purpose is simply this; they will definitely smooth out the airflow over the ends of the wings, thereby reducing tip drag and increasing the available lift and aileron effectiveness..."

Scale-like pylon racer designed for the Midwest-RCM Goodyear event.

Supplementary file notes

Article, thanks to hogal.

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