Compact is only the spring tension. And is designed for compression always takes a lot of space when storing. However, it is easy to make compact, if the pre-squeeze in the vise so that all the coils touch each other and then link them to the two sides of the wire.
Recommend to read
THE REBIRTH OF THE “HARD” ROCKET PLANE
First the model of similar schemes appeared in the all-Union competition in 1982. With them were athletes from Moscow. But at the time of competition for soft raketoplana the type of...
SNOWMOBILE-“CARTOP”
Imagine readers of the venerable magazine "modelist-Konstruktor" simple in construction and small in size snowmobile, it is available for self-construction. It was designed so that there...