In the practice of the house master often there are cases associated with loosening or tightening of screws of large diameter. Without the “powerful” screwdriver not to do. Equip her with a pen, as shown and work with it will be much easier.
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WORKING SLED
As soon as the first snow fell, it became clear that the house has no need of such cargo winter vehicle as a sled. Child's sled for a long time "went" on a well-deserved rest in a pile...
ATLAS PROFILES
PROFILE "NACA-6409". Developed in the early 30-ies in the aerodynamic laboratory of the NAC (USA) for lifting aircraft-biplanes. This profile can be recommended as models of gliders...
