oscillating fans like this are cheap but they're kind of wimpy so i thought what if
i make a fan blade to go on a one horsepower motor more of an airplane style propeller
about this long but i figured the motor probably won't spin that to
full speed because it's too long and i'll just shorten it until it gets up to speed
well that is way out of balance so i have to take quite a bit off of this side to balance it
so
it was about eight years ago that this motor one time went flying on me so this
time i gotta make sure it's screwed down all right ready for the first spin up
well i just blew the breaker actually i just heard this thing click
it was only the breaker on the power bar so i'll just have to plug it in directly
okay this time i really blew the breaker it was reading about 3000 watts and the reason the motor
was revving up and down all the time is because the starter capacitor and starting circuit got
it kind of close to speed and as soon as that kicked off the motor didn't have enough torque
to maintain that speed so i need to shorten these blades a little bit and the amount of power this
blade needs at a given rpm is proportional to its length cubed so i'm going to take off a little bit
here we go again
1.9 kilowatts 1.6
1.4 kilowatts i think i'll leave it at that all right what is the wind speed
all right that was a max of 18 meters per second or 66 kilometers an hour or 41 miles
now my fan versus a conventional fan i wonder if i can make this spin backwards
it did spin backwards i was a bit surprised by the thrust of that thing
ah [ __ ]
too much power switching that motor by plugging it into a cheap extension cord was
maybe not the best idea so i just switched it by plugging into the wall
it is hard to use not because it's heavy but because it's just
got too much thrust that you have to push against
works great on a driveway i don't even have to get near the loose
you