The quality of processing lumber a plane largely depends on the sharpness of the blade of the knife (or as it is called, is the glands). And because sharpened part is always from the body of the plane, when storing it is easy to damage. To protect the blade, it is possible to close the removable rubber ring.
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Double training aircraft "model 51" the firm", Temko aircraft Corporation" developed in 1955 in the framework of the competition announced the U.S. air force on the creation of training...
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If the solar rays fall on the thermometer, mounted outside window frame, it heats up and shows... its temperature, not the ambient air. To avoid this, protect the thermometer shade...
