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Making propellers.
Propeller is critical to the efficient use of engine power and maximum speed. Not surprisingly, the amateur who built a boat or motor boats, and then have to spend a lot of time fine-tuning and selection of optimal propeller.
Often have to make their own screws.
This can be done by welding - depending on the capabilities and experience of the builder. In all cases, marking and control surface of the blade needs to be done step slide. It is collected on the basis of plate-step, which is a steel circle with a diameter of 400-500 mm, in which a 10 mm radius eroded circumferential grooves and a width of 3 mm depth of 1-2 mm - the thickness of the material from which will be made by stepping squares. In the center of plate perpendicular to its surface set with centering hub saw the propeller cone.
Then, on both sides of the resulting mark lay distance from the midline of the incoming and outgoing edges. Giving allowance of 10-15 mm and the width of the blade on both edges, angle cut and bends it out of the 1.5-2 mm of metal for a given radius, taking into account the direction of rotation of the screw. These triangles must prepare a few - the number of grooves on the walking plate, if the screw has a diameter of 300 mm. Putting all the squares in place, get a spiral blade surface, which coincides with its injected side.
To install the triangles on the board hold the centerline of the blade - a straight line passing through the center of plate. Dividing the circumference, for which manufactured elbows, into equal parts according to the number of blades, set squares and to other lobes. With a steel ruler to the resulting hill walking on the risks to the midline of the rectangle, you can check the performance All risks must sit in a straight line, and line fit snugly to the edges of the rectangles.
If we now fill the space between pieces of foam gons, wood, etc., and then pour melted paraffin on top or wax, can be surface-forming models of fiberglass blades.
Cut patterns from sheet metal screws on the surface of engulfing the selected radius. Templates bent so that they coincide with the circles step polygons on the hill. Layers of fiberglass to impose as long as' e get the blade thickness of 1-2 mm larger than the thickness profile in the cross section. Shells on the blade surface putty, and then stained nitro enamels model.
With the use of walking hills can be manufactured as a complete model of the propeller, and the model of one of its blades. In the latter case, the model of the blades are made plaster molds on the number of blades, which when folded together, form a mold of the wax casting a propeller.
The model can also make the blades of several layers of thin plywood or plexiglass, bent it in hot form on a hill walking and pressed her to cool the work piece. Then the blade is treated with a loft, controlling the profile sections of templates. Machined out of Plexiglas and model of the hub, which make the slots for the blades spikes. When finishing putty to model the propeller blades of the connection to the hub, and the very model of the paint.