A free, fast, easy and efficient propeller (Una hélice gratis, rápida...)
I needed to place a small air extractor in the bathroom.

I had two or three low-power engine, but the propeller was attached to one of them was not good. Other of them it is too low power.

(Yo necesitaba colocar un pequeno extractor de aire en el bano. Tenia dos o tres motorcitos electricos de baja potencia, pero la helice de uno de ellos no estaba en buen estado, y uno de los motores era demasiado chico.)

Step 1: Scavenging among the saved stuff (rebuscando entre mis cosas)

A free, fast, easy and efficient propeller (Una hélice gratis, rápida...)
A free, fast, easy and efficient propeller (Una hélice gratis, rápida...)
I found three small 220V electric motors and a plastic empty bottle of sweetener (I even keep those things).

I chose the motor from the photo. It cames from an old old old grammophone (16, 33.3, 45 and 78 rpm).

Encontre tres motorcitos electricos de 220 volts y una botella vacia de endulzante (yo guardo incluso esas cosas). Elegi el motor de la foto. Proviene de un viejo, viejo, viejo tocadiscos (16, 33.3, 45 and 78 rpm)).

Step 2: To work

A free, fast, easy and efficient propeller (Una hélice gratis, rápida...)
A free, fast, easy and efficient propeller (Una hélice gratis, rápida...)
A free, fast, easy and efficient propeller (Una hélice gratis, rápida...)
A free, fast, easy and efficient propeller (Una hélice gratis, rápida...)
I cut the plastic bottle at half height. That gave me some leeway to make corrections later.

(Corte la botella plastica a media altura. Eso me dio cierto margen para hacer correcciones posteriores)

Step 3: The only difficult (ma non troppo) part.

A free, fast, easy and efficient propeller (Una hélice gratis, rápida...)
A free, fast, easy and efficient propeller (Una hélice gratis, rápida...)
A free, fast, easy and efficient propeller (Una hélice gratis, rápida...)
(La unica parte dificil, ma non troppo).

With a lighter (or so) you must blandish slightly the plastic at the bottle's "shoulder". Then, fold each blade 90 degrees outward.

(Con un encendedor (o algo asi), hay que ablandar ligeramente el plastico en el "hombro" de la botella. Luego, doblar cada hoja 90 grados hacia afuera.)

Step 4: We have not finished (No hemos terminado)

A free, fast, easy and efficient propeller (Una hélice gratis, rápida...)
A free, fast, easy and efficient propeller (Una hélice gratis, rápida...)
A free, fast, easy and efficient propeller (Una hélice gratis, rápida...)
This propeller will be too turbulent and inefficient. Fortunately this is easy to fix: There with the scissors to cut a straight line that goes from the middle of the end of each blade until the beginning of the trailing edge.

(Esta helice va a ser demasiado turbulenta e ineficaz. Afortunadamente eso se arregla facil: con las tijeras hay que cortar una linea recta que vaya desde la mitad del extremo de cada hoja hasta el inicio del borde de fuga.)

Step 5: Another little step (otro pasito)

A free, fast, easy and efficient propeller (Una hélice gratis, rápida...)
It would be truly miraculous that after the work we have done by hand, the four sheets have been exactly the same length. With the propeller attached to the motor shaft, place this vertically and turning it by hand we leaning any element to see what is the longest of the four blades. With the scissors shortened it an millimeter or two and repeat the procedure until all four are equal.

(Seria realmente milagroso que luego del trabajo que hemos hecho a mano, las cuatro hojas hubieran quedado exactamente del mismo largo. Con la helice fijada al eje del motor, ponemos este vertical y haciendolo girar a mano arrimamos cualquier elemento que sirva para ver cual es la mas larga de las cuatro hojas. Con la tijera la acortamos un milimetro o dos y reiteramos el procedimiento hasta que las cuatro queden iguales).


Step 6: I changed my idea about the motor (Cambi de idea acerca del motor)

A free, fast, easy and efficient propeller (Una hélice gratis, rápida...)
A free, fast, easy and efficient propeller (Una hélice gratis, rápida...)
A free, fast, easy and efficient propeller (Una hélice gratis, rápida...)
This motor is smaller. It will be a better option.

(Este motor es mas pequeno. Sera una mejor opcion.)
 
 

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