how to find the speed of blade if a rotor is turning at 300RPM?

Question

how to find the speed of blade if a rotor is turning at 300RPM?

Given value = the ceiling fan of my room turns at 300 RPM,the blade span is 0.5482 meters

1)i heard LINEAR velocity changes on every point on blade and Angular Velocity is CONSTANT on every point on blade.is it True?

2)if i calculate the Linear velocity of the blade tip,it is 41 Miles/hour
if i calculate the Linear velocity at the middle of the blade,its half of 41Miles/hour
and Linear velocity decreases as it go near the Rotor center

but i want the angular velocity,which is in 300RPM,but i want it in Miles/hour ,so if Angular velocity is
Constant at every point on blade,then that is the true speed of the blades in Miles/hour...

Answer 1

if the measurement from the end of one blade to the end of another is

.5482 m



the diameter of the circle is .5482m



C = πd

C = 1.7222210926979246533252211027138



every rotation is

1.7222210926979246533252211027138 m



300 rpm

300 * 1.7222210926979246533252211027138 = 516.66632780937739599756633081415



so every minute

516.67 m per minute



(516.67 m / 1 min)(60 min / 1 hour)(1 mile / 1609.34 m) =

31000.2 miles / 1609.34 hours

19.262679110691339306796574993476

19.3 mph

Answer 2

like with fixed wings, the smaller the rotor diameter, the greater agile approximately longitudinal axis the helicopter is. besides, the greater blades in the rotor, the greater effectual its regularly occurring efifciency. the problems of shape often limit us to 4 or 5 maximum (yup, superstallion has ?seven?) to not talk of accepted earnings of smaller diameter - smaller hangar, smaller touchdown section.. with inflexible rotor heads, the earnings of diverse blades combines with marginal strengthen in the rotor hub complexity. (evaluate the rotor hub of md500 with Mi 24 rotor hub) as for the value - the diameter of rotor impacts the utmost forward velocity - as quickly through fact the blade tips initiate achieving intense mach quantity, the overall performance deteriorates. (one among clarification why Mi 24 has shorter blades than comparable yet slower with the help of layout Mi17 - to attain greater beneficial speeds) one among downsides of smaller rotors is regularly occurring greater beneficial velocity of air conflict via that rotor. in particularly ordinary words, the helicopter is carried with the help of pushing adequate air undeneath. the smaller the diameter, the greater beneficial the consequent velocity to push given weight of air downwards. speaking of JetRanger derivates - it somewhat is merely evolution of the old good huey and its seesaw rotor hub - particularly ordinary, and decrease priced. in case you spot, comparable, modern-day hulls like 412 sequence have 4 blade rotors. summed up> in case you're designing a SMALL helicopter, and have composite ingredients and inflexible rotor hubs in hand, you will not destroy your layout with cumbersome 2 blades rotor the place you've 5 short blades gently humming, waiting to in a single day everywhere a pickup might.

Answer 3

Laser Radar Gun, the ones the police use

Answer 4

Touch it.