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Q-3 and Q-2 Rules - 10/23/2001These rules are evolving and are subject to change. As the rules stand now, any legal Q-500, QM-40, or F1 airframe meets the airframe rules.
Please note: The muffler rules will be changing. One addition will be a limit of 100db (or less) at 3 meters. Please email DonStegall@carolina.rr.com if you have input into the muffler matter for this class.
Q-3I. AIRFRAME A. WEIGHT Minimum 3-1/4 pounds, maximum 4-1/2 pounds. B. WINGS 1. Area: Minimum 400 square inches. 2. Span: Minimum 48 inches, maximum 56 inches (projected). 3. Chord: No limit. 4. Airfoil thickness: Minimum 1 inch thick at the centerline, or minimum 7/8 inch at the "no-go" point (see paragraph III.H. of the AMA Pylon Racing Rules). Thickness shall progress uniformly in a straight line or convex taper from root to tip; except that, if the plane is a replica of a full-scale prototype that has a different progression, the progression on the model may be similar.. C. FUSELAGE 1. Depth: Minimum 3-1/4 inches at its deepest point, which must occur within the wing chord. 2. Width: Minimum 2-5/8 inches at its widest point. Width and depth points need not coincide. Width does not include fillets or cheek cowl fairings. 3. Cross-section: The fuselage may have a simple, rectangular "box" cross-section or a rounded shape. Diamond-shaped cross sections are prohibited. Fillets or fairings between the fuselage and wing are allowed. Canopies and turtle decks are acceptable but shall not be included in width or depth measurements, unless the contestant can provide templates or proof that the cross-sectional area of the fuselage is at least 12.5 square inches. 4. Engine installation: The engine and engine mount may be fully exposed. Cowling or streamlining of the engine is also 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. D. LANDING GEAR The landing gear shall be fixed, with at least 2 main wheels of a diameter not less than 2-1/4 inches. The main wheels shall be at least 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. II. POWERPLANT A. ENGINE 1. Maximum displacement: 0.381 cubic inch. 2. Configuration: Stock, commercially available, front-intake, side-exhaust. The engine shall have mounting lugs on each side of the engine with 2 bolt holes per lug with a center-to-center measurement of .59 inches (15 mm). The center-to-center measurement across the engine shall be 1.5 inches (38 mm). The maximum crankcase width at the bottom of the mounting lugs shall be 1.25 inches (31.75 mm). 3. Intake: A single carburetor or venturi with a maximum inner diameter of 8 mm (0.315 inch). Carburetors or venturis may be modified and are not subject to availability rules. The carburetor may be locked or pinned in the open position and needs not be functional; except that, if the carburetor is not functional, a separate engine shutoff mechanism shall be used. A venturi requires that a separate engine shutoff mechanism shall be used. 4. Exhaust system: (a) General description: The engine shall be equipped with an expansion chamber muffler, zero-boost muffler, or tuned muffler, 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). (b) Inner configuration of tuned mufflers: A tuned muffler used in this event shall have only one internal part, a straight tube or extractor of the type commonly known as a "mini-pipe". The mini-pipe shall have a constant, circular cross-section and constant inside and outside diameter, with the following exception: the sidewall of the tube may be thickened, not to exceed 1/16 inch wall thickness, within 2 inch of the front end of the mini-pipe where it attaches to the header. (c) Outside dimensions: 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. (d) Modifications: 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. 5. Fuel feed: Other than muffler pressure, no fuel system pressurization is permitted. B. PROPELLER 1. Materials: (a) Wood; or (b) APC composite or carbon composite, or similar composite. 2. Dimensions: Minimum diameter 7 inches. 3. Availability, modification: Propellers shall be commercially available and stock, except as otherwise provided in paragraph VII.E.2. of the AMA Pylon Racing Rules. C. FUEL The fuel shall be commercially available, containing not over 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. III. SPECIAL PROVISIONS The CD or the CD's designee may elect to check the top 3 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. Q-2All Rules for Q-2 are the same as the Q-3 rules with the following exception: II. POWERPLANT A. ENGINE 1. Maximum displacement: 0.281 cubic inch. |
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Send mail to DonStegall@carolina.rr.com with questions or comments about this web site.
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