Cannon DIGI-TROLL 10, Owner'S Manual

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Blowback
Simply stated, blowback is what happens to the
downrigger weight when you pull it through the water
behind your boat. As your speed increases, so does the
horizontal distance between the weight and your
downrigger. The faster you go, the farther the weight is
behind you. The farther the weight is behind you, the
shallower the weight is.
The following charts provide you with blowback
information for three sizes of Cannon downrigger
weights pulled at three different speeds with no lures
attached and with no current. Current drag, water
salinity and the use of non-Cannon products will affect
your actual trolling depth.
As an example, the first chart shows that if you are
trolling at 4 MPH with an 8 pound weight and you have
100 FT. of cable in the water with no current; the
downrigger ball is actually at a depth of about 80 FT.
12-Lb. Weight at 2, 4, and 6 MPH
2 MPH
4 MPH
6 MPH
Act
u
al De
pt
h of Weigh
t (
ft.)
Amount of Cable in Water (ft.)
4 MPH
6 MPH
Amount of Cable in Water (ft.)
A
c
tualDepth of
W
e
ight
(
ft.)
2 MPH
8-Lb. Weight at 2, 4, and 6 MPH
2 MPH
4 MPH
6 MPH
Act
u
al De
pt
h of Weigh
t (
ft.)
Amount of Cable in Water (ft.)
Blowback Charts
10-Lb. Weight at 2, 4, and 6 MPH
Blo
w
b
a
ck Ca
lc
ulati
ons