To help the fins. Drawing, description

PERSONAL TRANSPORT: GROUND, WATER, AIR
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To help the fins. Personal transport

Personal transport: land, water, air

Directory / Personal transport: land, water, air

No matter how well you swim, the speed will increase if you have fins on your feet. But what if you take some device in your hands? For example, sticks with blades? It will turn out something like skiing with sticks, but only on the water. Such a curious projectile can be made for a water holiday at a summer camp and arrange a speed contest.

Stick with blades

Help for flippers
The pictures show how a stick with blades works. Above: idle. the stick goes forward, the blades are folded. Below: working stroke, the swimmer pulls the stick towards him, the blades open.

Swimming sticks are made as follows: take four duralumin plates about 200x300 mm in size. Connect their long sides with a wire spiral. Insert a metal rod into the spiral so that it passes through the end of the stick - it will fix the blades to it. Now make a hole in the edges of the blades, insert a cord into them and fix its ends on the sash and on the stick. The length of the cord must be such that the open sashes form an angle of no more than 70 °.

To master the projectile, you first need to practice a little. Enter the water, having reached a sufficient depth, lie on your back and throw out your hands with a stick behind your head. Then pull up. Due to the resistance of the opened doors, you will move forward. Then push the projectile forward again, it goes easily, as the doors fold, and pull yourself up again.

If the restrictive cord is moved to the other side of the wings (for this they need to be moved higher), then the sticks can be held not behind the head, but at the feet, and not pulled up, but, on the contrary, repelled. In this case, it is better to increase the length of the pole a little. The speed of a swimmer with fins and sticks will be greater than if he swam only with fins.

Author: P.Petrov

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