Another question, now about propellers
Thread Starter
Joined: Oct 2001
Posts: 55
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From: Portugal
Another question, now about propellers
This one, someone asked it to me yesterday, but a didn`t know what to say!
Why do some planes have propellers with round tips and ohters have flat tips...
Like the S360 or the P3 orion
Thanks a lot!
Why do some planes have propellers with round tips and ohters have flat tips...
Like the S360 or the P3 orion
Thanks a lot!
Moderator
Joined: Feb 2000
Aviation Qualifications: CPL
Posts: 14,480
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From: UK
The advantages of round tips are that they are (usually) more efficient, quieter and look prettier.
The advantages of square tips are that they allow greater disk density so greater thrust if there is a particular reason to limit the diamter you should be able to get as much thrust as you want, they also are generally cheaper and easier to make in modern materials.
G
The advantages of square tips are that they allow greater disk density so greater thrust if there is a particular reason to limit the diamter you should be able to get as much thrust as you want, they also are generally cheaper and easier to make in modern materials.
G
Joined: Feb 2000
Posts: 4,704
Likes: 589
From: 500 miles from Chaikhosi, Yogistan
Don't forget the Q Tips which have the tips folded rearwards. Works for similar reasons to a winglet methinks.
Still looks like the props have touched the ground at full power though!
Still looks like the props have touched the ground at full power though!
Joined: Oct 2000
Posts: 461
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From: Bristol
I, too, think it wise to agree with Genghis.
If you want range, you want an efficient prop, and the blade will look like an efficient wing, ie. elliptical plan form with nice low induced drag pointy tips. If you just want to get some lead sled off the runway as quickly as possible then you have big coarse slabby blades.
Dick W
If you want range, you want an efficient prop, and the blade will look like an efficient wing, ie. elliptical plan form with nice low induced drag pointy tips. If you just want to get some lead sled off the runway as quickly as possible then you have big coarse slabby blades.
Dick W
