16.3. Event 424: Sport Quickie
16.3.1. Airframe. The airframe specifications for this event are identical to those for Quickie 500 (Event No. 428) with the following exceptions: wing and tail construction. Wings and tails must be constructed of either all wood or wood sheeting over a solid foam core. Wings and tails manufactured in molds designed to produce hollow core structures are prohibited. Traditional fiberglass reinforcement or carbon fiber or inset wood spars continue to be acceptable. The last three inches of each wing tip may be made of any material. The intent of the rule is to keep the cost of participation to a minimum.
16.2.1. Airframe
a. Weight. Minimum 3-1/2 pounds, maximum 4-1/2 pounds.
b. Wings.
1) Area: Minimum 500 square inches.
2) Span: Minimum 50 inches (projected), maximum 52 inches (projected).
3) Chord: Constant for at least 47-1/2 inches of span.
4) Airfoil thickness: Minimum 1-3/16 inches for at least 47-1/2 inches of span.c. Fuselage.
1) Depth: Minimum 3-1/2 inches at its deepest point, which must occur within the wing chord.
2) Width: Minimum 2-7/8 inches at its widest point, which must occur within the wing chord. Width and depth points need not coincide.
3) Cross-section: The fuselage shall have a simple, rectangular "box" cross-section with a maximum radius of 1/4 inch at the corners. Diamond-shaped cross sections are prohibited. Fillets or fairings between the fuselage and wing are prohibited. Canopies and turtle decks are acceptable but shall not be included in width or depth measurements. The front firewall shall be a rectangular, flat plate measuring at least 2-1/4 inches by 2-1/4 inches. The perimeter of the front firewall may be rounded to a maximum radius of 1/4 inch.
4) Engine installation: The engine and engine mount shall be fully exposed. No cowling or streamlining of the engine is permitted. A backplate-type radial engine mount that replaces the stock engine backplate may be used so long as it displaces the same crankcase volume as the stock backplate assembly. Corners and edges of the engine mount may be rounded to a maximum radius of 1/4 inch.d. Landing Gear. The landing gear shall be fixed, with at least two main wheels of a diameter not less than 2-1/4 inches. The main wheels shall be at least seven (7) inches apart, measured parallel to the wing span. No wheel pants, wheel spats, or strut fairings shall be used to streamline the main landing gear. Struts shall be either round wire, at least 1/8-inch in diameter, or flat stock no more than 1/8-inch thick. Flat stock may be filed or otherwise shaped to an airfoil cross-section but must have a blunt leading edge. Nose or tail wheels, if used, may be streamlined or enclosed.
16.3.2. Powerplant
a. Engine.
1) Maximum displacement: 0.403 cubic inch.
2) Configuration: Stock, commercially available, front-intake, side-exhaust.
3) Intake: A single carburetor, as supplied by the manufacturer of the engine being used, with a maximum inner diameter of 0.325 inch. The carburetor shall be fully functional and shall be stock, except for longevity-enhancing modifications as follows:(a) Adjustment screws and idle needle valves may be held in place with commercially available thread locker, epoxy, or other adhesives and safetied with rubber bands, wire, or plastic ties.
(b) Barrel retaining screws or pins may be replaced with commercially available screws or pins of harder material and may be held in place with commercially available adhesives. Barrels may be deburred for smoother movement and may be safetied with rubber bands, wire, or plastic ties.
(c) Throttle arms may be modified or replaced.4) Exhaust system: The engine shall be equipped with an expansion chamber muffler or zero-boost muffler as provided by the manufacturer of the engine being used, and having a single exhaust outlet with a maximum outlet area of 0.0621 square inches (equivalent to the area of a round hole measuring 9/32 inch in diameter). The distance from the center of the piston to the centerline of the muffler shall not exceed 2-3/4 inches. The overall length of the muffler shall not exceed 7-1/4 inches, measured from the front of the header to the back of the exhaust outlet. The outside diameter shall not exceed 1-3/4 inches. No modifications to the muffler are permitted except that the muffler may be tapped for a pressure fitting to supply pressure to the fuel system. Tuned mufflers and tuned pipes are prohibited.
5) Fuel feed: Other than muffler pressure, no fuel system pressurization is permitted.
6) Power output: Sport Quickie is intended as an entry-level event for pilots who are new to racing. Sample engines are tested via committee and a list of permissible engines is published and updated as necessary, annually. Criteria include purchase price and power output in both the normal takeoff RPM range and the presumed in-air (“unloaded”) RPM range. Any engine with a tuned muffler is strictly prohibited. The cost of the engine must be below $120 (street price). If engines more powerful than this are to be used at a contest, the contest should be sanctioned as Quickie 500 (Event No. 428), not sport Quickie.7) Prior approval of engines: All engines, past and future inclusive, shall not be entered into competition until a five-member sub-committee of the RC Racing Contest Board has approved the engine by an affirmative vote of at least three members thereof. Such approval may be given orally, but shall be recorded for future reference. An engine shall be considered eligible for competition if it meets all requirements of section 16.3.2 and, in addition, does not hinder the state of this entry level event as determined by the aforementioned five-member committee. The committee is appointed by the Racing Contest Board Chairman and will not include any member with a vested interest in the sale of manufacturing of an engine for this event. In addition any engine can be removed from the list by an affirmative vote of at least three members thereof.
b. Propeller.
1) Material: APC composite or a similar, commercially available composite.
2) Dimensions: Minimum diameter nine (9) inches. Nominal pitch six (6) inches, as indicated by the manufacturer’s stamp or packaging.
3) Availability, modification: Propellers shall be commercially available and either supplied by the hosting organization or specified by brand and size in all pre-contest publicity. Propellers shall be stock, except as otherwise provided in paragraph 7.5.2.c. Fuel. The fuel shall be commercially available, containing not more than 15 percent nitromethane, and shall be supplied and dispensed by the hosting organization. The dispensing operation shall include draining the tank of any existing fuel and then filling from a supply container when the pilot brings the aircraft to the ready box.
16.3.3. Special Provisions
a. Routine inspections encouraged: The CD or the CD's designee may elect to check the top three finishers' engines for legality at the end of the contest. In addition, CDs are encouraged to check the carburetor bore, muffler outlet area, and propeller diameter of aircraft that are being weighed immediately after each heat.
b. Rule variations permitted: The engine rules specified below have been used successfully on a local basis to limit the cost or power output of engines used in this event. These and any other variations from the rules specified above should be noted in all pre-contest publicity.
Note: any variation that results in the use of engines larger than 0.403 cu. in. displacement, tuned mufflers, or tuned pipes will result in the event being sanctioned as Quickie 500 (Event No. 428) rather than Sport Quickie.1) Claiming rule: In addition to either or both of the above approaches, a claiming rule allows any contestant to purchase any other contestant’s engine after the contest for a specified price. $100 is suggested.