I think your ceiling fan rpm is quite ok which is 300rpm. Length of blade is 1.91 feet? i think it is the blade span. Then you calculate rps. Ok. You get the data as cm/sec, then convert to miles/hr. Is that right? So you need the Tip speed?
More info here: **broken link removed**
but i want to know the Air speed the blade is experiencing,any ideas on how to calculate it?
What exactly are you trying to do? A ceiling fan can only circulate the air which is present at its surroundings. Are you trying to harness wind power with it? :wink:
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On a serious note...you can find the speed at the middle of the blade by halving the blade span with highly approximate results. Rather it would be erroneous also because the middle of any given ceiling fan is curved inwards. And there will be some air pressure considerations too.
Just a question about english language: I never really understood the difference between the two words "speed" and "velocity". When I've to use "speed" and when "velocity" ?rotor only moves at angular velocity.
tip also moves at same angular velocity but converted to a scalar linear velocity.
you're comparing apples and oranges. The angular velocity is constant everywhere on your fanblade, the LINEAR velocity is not. And you don't "need to calculate the angular velocity of the blade", you already stated that it's 300RPM!!
so how can i convert that 300RPM to Miles/hour? is it possible?
You can convert minutes in hours, but how can you directly convert rotation in miles ? it makes no sense. As the name said, the angular velocity represent the motion of the angle (in degree or radians); you can convert between angle and "rotation" because 1 complete rotation = 360 degrees. For instance, if you want you can convert RPM into degrees/hour.
Linear velocity is, instead, the motion in length, that is meters, miles, etc..
Speed or Velocity Definitions:Just a question about english language: I never really understood the difference between the two words "speed" and "velocity". When I've to use "speed" and when "velocity" ?
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