Compound Bow with Eccentric Pulleys — Explorer
Core Ideas · US 3,486,495 · the model of document B, recomputed live in JavaScript
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Eccentricity
e/r
axle off the centre ·
, eq. (19)
Draw length of the archer
the bow is set for 30 in
Arrow mass
Bow with the string tied
same peak
same energy
Draw (from brace)
▶ draw
reset
fixed data (B §5.1, §7)
peak draw force
311.4 N (70 lb)
brace height
177.8 mm (7 in)
limb arm
400 mm
hinge height
250 mm
limb at brace / unstrung
20° / −5°
virtual mass of the bow
3.88 g
The bow, to scale
· pale: brace
The pulley, enlarged
string
cable
p
s
p
c
draw force
Diagrams along the draw
diagrams
values
draw force along the draw
eccentric pulleys
string tied to the limbs,
same peak
rectangle of eq. (16)
lever arms of string and cable about the axle
energy, holding force and arrow speed
conditions
The conditions are those of B §7.2: the bow with the string tied is set for the same peak.