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2. Crossbow bolt - Wikipedia

   en.wikipedia.org/wiki/Crossbow_bolt

   Generally, the bolts are 15 to 22 inches long but the standard length is 20 inches. Experts recommend longer bolts [4] but they have certain disadvantages as well. The weight of the bolt can have a serious effect on the range of the bolt. The bolt's total weight includes the bolt's weight, nock, insert, vanes, and broadhead or field point.

3. Crossbow - Wikipedia

   en.wikipedia.org/wiki/Crossbow

   There is an optimum weight for bolts to achieve maximum kinetic energy, which varies depending on the strength and characteristics of the crossbow, but most could pass through common mail. Crossbow bolts can be fitted with a variety of heads, some with sickle-shaped heads to cut rope or rigging; but the most common today is a four-sided point ...

4. Arbalist (crossbowman) - Wikipedia

   en.wikipedia.org/wiki/Arbalist_(crossbowman)

   GNAS recognizes three grades of arbalist, [14] Master Arbalist (scoring 780 or higher in three qualifying Crossbow Windsor Rounds) Arbalist 1st Class (scoring 630 or higher) and Arbalist 2nd Class (480). A Crossbow Windsor Round is shot on a 60 cm 10-zone face scoring 9,7,5,3,1; three ends at 40 yards, three at 50 yards and three at 60 yards.

5. History of crossbows - Wikipedia

   en.wikipedia.org/wiki/History_of_crossbows

   The source actually says Zhuge invented a multiple bolt crossbow that could shoot ten iron bolts simultaneously, each 20 cm (7.9 in) long. [44] In 759 AD, Li Quan described a type of multiple bolt crossbow capable of destroying ramparts and city towers: The arcuballista is a crossbow of a strength of 12 dan, mounted on a wheeled frame.

6. Arbalest - Wikipedia

   en.wikipedia.org/wiki/Arbalest

   Since the arbalest was much larger than earlier crossbows, and because of the greater tensile strength of steel, it had a greater force. The greater draw weight was offset by a shorter draw length, which limited the total potential energy that could be transferred into the crossbow bolt. A skilled arbalestier (arbalester) could loose two bolts ...

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   www.aol.com/just-worried-social-security-now...

   Furthermore, 43% of retirees believe their benefits will be cut in the future, while 47% of nonretired adults worry that Social Security won't be able to pay them a benefit at all once they retire.