Yellow Jacket (oz12061)
About this Plan
Yellow Jacket. Radio control pylon racer.
Quote: "The Yellow Jacket. By Alan Clark.
Recently here in Huntsville, Alabama there has been considerable controversy over second and third generation 1/2A racers: Whether or not they should be allowed to compete with first generation 1/2A racers? This question developed into one of prime importance when it became apparent after only a few races that first generation 1/2A racers were no match for the more recent speedsters. The Rocket City Radio Controllers solved this problem by creating an unlimited class for 1/2A racing, with only two requirements: The aircraft must use an .049/ .051 engine, and have a minimum of 200 sq in of wing area. I believe that it is only a matter of time before an official unlimited class will be created, allowing second and third generation 1/2A racers to compete with planes of their own speed.
The Yellow Jacket is an unlimited class 1/2A racer. It is not legal for 1/2A racing as it currently exists, nor was it intended to be. The Yellow Jacket is designed expressly for this unlimited class purpose, utilizing aerodynamic refinements and a lightweight structure which result in an extremely fast, maneuverable 1/2A racer.
The most obvious thing about the Yellow Jacket is its low frontal area. The fuselage is just large enough to comfortably hold two miniature servos, a receiver, a 225 battery pack, and a 1 oz tank.
A wing with laminar flow and low frontal area was obtained by using a 25-1/4 in span, 8 in chord airfoil with a thin airfoil section. The airfoil section is a fully symmetrical, 9.5% section with the high point at 45% of the chord, giving good laminar flow characteristics and higher Reynolds numbers than those obtained from the usual 6 in chord wing.
One aileron was used to provide a yaw force helping to keep the nose up in the turns. This added yaw force allows one to make a tighter turn without altitude loss than can be made with a two-aileron ship. (This only applies to left turns.)
The nose of the Yellow Jacket has been tapered down to about 1/2 in thickness, allowing more propeller to be exposed to the air than would be if the typical 1/2 A fuselage faired into a spinner was used. An added benefit of using no spinner or cowling is increased airflow around the engine, allowing better cooling when using high nitro fuels..."
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