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Hi, I have a question that has stumped me for a while, well its been a while since I have done any academic work and its annoying me that I just can't work it out.
Here it is:-
You have 3 propellers, we shall call them A, B and C
Propeller A is a small propeller
Propeller B is a medium sized propeller
Propeller C is a large propeller
the common fact is they all rotate at the same speed
The quetion asked is:- If the shafts of these propellers are all rotating at the same number of RPM's, which propeller tip is traveling at the fastest speed.
Now the answer is C, but why?
Can anyone tell a stupid 40 year old why this is so, is there an equation that shows me this to be true.
if it makes it easier for someone to explain let's say there was some measurements on the diagram.
lets say the RPM's were 15
lets also say that prop A, from centre of shaft to tip of blade is 0.5m
lets also say that prop B, from centre of shaft to tip of blade is 1.0m
and finally, prop C, from centre of shaft to tip of blade is 1.5m
any help would be appreciated
Here it is:-
You have 3 propellers, we shall call them A, B and C
Propeller A is a small propeller
Propeller B is a medium sized propeller
Propeller C is a large propeller
the common fact is they all rotate at the same speed
The quetion asked is:- If the shafts of these propellers are all rotating at the same number of RPM's, which propeller tip is traveling at the fastest speed.
Now the answer is C, but why?
Can anyone tell a stupid 40 year old why this is so, is there an equation that shows me this to be true.
if it makes it easier for someone to explain let's say there was some measurements on the diagram.
lets say the RPM's were 15
lets also say that prop A, from centre of shaft to tip of blade is 0.5m
lets also say that prop B, from centre of shaft to tip of blade is 1.0m
and finally, prop C, from centre of shaft to tip of blade is 1.5m
any help would be appreciated