![]() Shock Cord Attachment – a metal eye for the secure attachment of the shock cord.ĩ The Egg Eggs have an ‘arch structure’ at each end that transfers pressure to the sides. Also protects the payload from the ejection gases. Tube Coupler – connects the payload section to the booster section by means of the shock cord. Must have vent holes in airframe in order to operate properly. Altimeter – measures the changing air pressure to calculate apogee. Bulkhead – separates the egg section from the electronics section, preventing vortex effect and causing a false altimeter reading. Payload Section Nose – creates an aerodynamic shape. Shock Cord Attachment – a metal eye for the secure attachment of the shock cord. The Paradigm–5 is an example of a low-drag, high performance model rocket design that uses a low-drag clipped delta fin.Ĩ Payload Section Nose – creates an aerodynamic shape. The Paradigm–5 is an example of a low-drag, high performance model rocket design that uses a low-drag clipped delta fin. To increase the fin, increase the span (S) only. The thickness of the fin at the tip (C tip) = 0.1 of the tip length (C tip) To reduce the fin, reduce the C root and C tip only. The thickness of the fin at the root (T root) = 0.1 of the root length (C root). Multiply it by 2 to determine the root length and the span (C root and S) The length of the tip (C tip) is equal to the airframe diameter. ![]() Low Drag Clipped Delta Fin To determine the dimensions of a low drag fin: Determine the diameter of the airframe. ELLIPTICAL Best aerodynamic fin, difficult to construct. TAPERED SWEPT Moves Center of Pressure back, good design for fast moving rockets. Elliptical: Best aerodynamic fin, difficult to construct. Clipped Delta: Good aerodynamic fin, used on low-drag, high-performance rockets Trapezoidal: Good aerodynamic fin for payload rockets, moves the Center of Pressure forward. Fin Shapes: Rectangular: Simple to make, least aerodynamic Swept: Simple to make, slightly better aerodynamics Tapered Swept: Moves Center of Pressure back, good design for fast moving rockets. RECTANGULAR Simple to make, least aerodynamic CLIPPED DELTA Good aerodynamic fin, used on low-drag, high-performance rockets SWEPT Simple to make, slightly better aerodynamics TRAPEZOIDAL Good aerodynamic fin for payload rockets, moves the Center of Pressure forward. Fins – guides the rocket in a straight path.Ĥ The Fin Parts of a rocket fin: Leading edge Tip Trailing edge Rootĥ Simple to make, least aerodynamic CLIPPED DELTA Engine Retainer – prevents the engine from being ejected by the ejection charge. Engine Mount – holds the rocket engine inside the rocket. Centering Rings – attach the engine mount (and sometimes the fins) to the airframe. ![]() Shock Cord Attachment – attaches the shock cord to the booster section. Shock Cord – connects the parachute and nosecone to the booster. Parachute – assists in the safe recovery of the rocket. Booster Section Launch Lug – helps to guide the rocket upward until it reaches enough velocity for the fins to engage. Fins – guides the rocket in a straight path. Presentation on theme: "LESSON LD02 The Model Rocket"- Presentation transcript:Ģ Diagram of a typical payload carrying model rocketģ Booster Section Launch Lug – helps to guide the rocket upward until it reaches enough velocity for the fins to engage.
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