Week 3 rotor wing test
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Questions and Answers

Which blade design has the best aerodynamic pitching characteristic

Symmetrical

Which blade design produces more lift for the same surface area

Asymmetrical

How do engineers get the same aerodynamic pitching characteristics to of the asymmetrical blade

By sweeping the edge 3 degrees upward

What is the more common design utilized by manufacturers for rotor blades

<p>Symmetrical, because of its aerodynamic pitching characteristic</p> Signup and view all the answers

What are the two types of planforms

<p>Parallel/uniform and tapered</p> Signup and view all the answers

what is the uniform planform

<p>When the leading edge and trailing edge run parallel from the blade tip to root</p> Signup and view all the answers

What is taper planform

<p>When the leading edge and trailing edge converge towards tip and the chord length decreases</p> Signup and view all the answers

What planform do manufactures prefer to produce

<p>Uniform, because they only need one rib part number</p> Signup and view all the answers

What planform produces more equal lift without correction

<p>Tapered, because it accounts for slow spinning speed near the root</p> Signup and view all the answers

What blade planform produces greater lift if the area of the blades were equal

<p>uniform</p> Signup and view all the answers

How did engineers compensate for more lift being created at the root of the blade on uniform planforms

<p>By putting a negative twist on the blade</p> Signup and view all the answers

What is a feature that is common to all leading edges of rotor blades

<p>Stainless steel capping protecting the rotor blade from erosion</p> Signup and view all the answers

What causes erosion

<p>Dust particles in the air</p> Signup and view all the answers

Why is the bottom of rotor blades painted black

<p>To prevent glare from getting in the pilots vision</p> Signup and view all the answers

What rotor blades require additional static discharge capabilities

<p>Composite rotor blades</p> Signup and view all the answers

How do we handle static discharge

<p>Bonding strips from tip to root of the blade</p> Signup and view all the answers

Why do we use bonded construction

<p>It is stronger and there is no drilling</p> Signup and view all the answers

What happens if single pocket skin is damaged

<p>It gets thrown out</p> Signup and view all the answers

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