Exam (elaborations)
Propellers and Systems Week 1, 2, & 3 (1)
- Course
- Biochemistry Module 3
- Institution
- Biochemistry Module 3
Propellers and Systems Week 1, 2, & 3 (1)
[Show more]
Seller
Follow
Content preview
What precautions should you take before working on or rotating propeller? (5) -CORRECT ANSWER-1. mixture to cutoff
2. magneto switch to off
3. fuel selector valve to off
4. ground p-leads
5. remove spark plug leads
What is the propeller mounted to on low power engines? High power? - CORRECT
ANSWER-low: crankshaft
high: gear reduction system
What is the purpose of a propeller? - CORRECT ANSWER-convert engine brake
horsepower into thrust horsepower
What makes the AOA of propeller? - CORRECT ANSWER-chord line and relative
wind
When are the AOA and blade angle equal? AOA less than blade angle? - CORRECT
ANSWER-Equal: stationary and propeller rotating
Less: moves forward ( relative wind decreases)
Why is blade twisted so root has high AOA and tip has low AOA? - CORRECT
ANSWER-more even distribution of thrust
compensate for difference in rotational speed of blade
, Where is blade angle the lowest? - CORRECT ANSWER-tip
What are the 5 forces acting of a rotating propeller? - CORRECT ANSWER-1.
centrifugal force
2. torque bending force
3. thrust bending force
4. aerodynamic twisting force
5. centrifugal twisting force
Which force causes blade angle to increase and RPM to decrease? - CORRECT
ANSWER-aerodynamic twisting force
Which force causes blade angle to decrease and RPM to increase? - CORRECT
ANSWER-centrifugal twisting force
What are the hardwoods most commonly used for wooded propellers? - CORRECT
ANSWER-birch and ash
What is the minimum number of laminated layers for a wooden propeller? -
CORRECT ANSWER-5
Why are laminated layers preferred over solid wood? - CORRECT ANSWER-less
warp
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller lydiaomutho. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for CA$11.58. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
77858 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now