Ring Leader (oz6324)
About this Plan
Ring Leader. CL speed model.
Quote: "Crossing know-how with craftsmanship will make you Ring Leader in a plot to snatch the controliner champeenship. Ring Leader, by Bernard Schoenfeld.
Speed on controline models is not necessarily achieved by reducing the frontal area to a minimum. By the proper application of some sound aerodynamic theory. speeds well in excess of one hundred miles per hour can be obtained with ease.
Although streamlining a model does mean reducing the frontal area to a minimum, it also means streamlining the aerodynamic balances of the model. This means that a model, whether it be free-flight or tethered. must utilize the same aerodynamic theory and must be capable of maintaining stability under any flight condition. Bearing this in mind, when designing a model for high speed, will result in a model like the Ring Leader.
Most of the high speed controline models we see today use very little wing area, for the purpose of reducing drag, and, for the same reason, they incorporate fuselages that look like broom sticks. However, it is a well known fact that it takes a certain amount of wing area to keep a model in the air. By sacrificing the wing area, the budding speedster neglects to consider the fact that he is putting an added load on the propeller and engine of his ship.
In order for the model to stay in the air at all, it must keep the nose up at all times. When the model flies in this attitude it is mushing, and though it is not always perceptible, the prop is continuously stalled. The result is inefficient transmission of the power of the engine. Streamlined airfoil sections mounted at zero degrees of incidence, as is the common practice, produce a wing that is incapable of lifting comparatively heavy ships in the air.
The Ring Leader incorporates many unconventional features for a controliner, but not to the extent of being different for difference's sake. It was designed like a free-flight model, and though we haven't chanced flying it that way, we believe it is capable of doing so. The wing and tail are lifting sections mounted at three and two degrees respectively, and the engine mounted at zero. To minimize the engine load, the airfoil sections were developed from the NACA 64 series to have the highest possible lift-to-drag ratio at one hundred and thirty miles per hour and maximum efficiency at three degrees angle of attack.
To keep the wing area at a minimum, it is necessary to hold the weight down. To accomplish this, the fuselage was made with bulkheads and planking instead of being carved from a solid block, and the wings are built up from one-sixteenth sheet balsa.
A little while back I mentioned that speed models were beginning to look like broomsticks in order to reduce the frontal area. However, this is not the way to reduce drag. It is a known fact that perfect teardrop shapes are most efficient and more streamlined if the widest point is one-third back from the front of the ship. This is exactly the shape of the Ring Leader. Instead of having the engine stuck out in the breeze, a cowling was added which will maintain the engine-temperature at a constant degree and streamline it considerably. Directional stability was greatly improved by adding the long dorsal fin..."
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