Beta Marine Beta 10 Operator's Maintenance Manual page 13

11
The keel cooling tank size should have
a surface area exposed to the canal
or sea water of:
0.25 x the bhp of the engine = the square
feet of cooling area required (for steel hulls)
Important: If you boat has a hydraulic drive,
you will need to increase the surface area by
approximately 30% percent.
If you have any questions about keel cooling please refer
to our design guidelines detailed on our website, or ask us.
Engine Model
Beta 14
Beta 16
Beta 20
Beta 25
Beta 30
Beta 35
Beta 38
Beta 43
Beta 50
Beta 60
Water Level
Steel Tanks Steel Tanks
Size (ft) Size (m
3.5 0.33
4.0 0.38
5.0 0.46
6.3 0.59
7.5 0.70
8.8 0.82
9.5 0.88
10.8 1.00
12.5 1.16
15.5 1.43
12
Efficient keel cooling tanks are side mounted, see
2
)
illustration. The ideal keel cooling tank should have:
a) The 'baffle' continuously welded to the outer skin
and should be close fitting to the inner skin.
b) The tank should be thin in section (30mm to
40mm) as it is the heat transfer to the canal or river
water that is important.
c) The tank must have air bleed valves fitted on the
top at both ends of the tank.
d) The hot water feed enters at the top of the tank
and the engine return comes out of the bottom.
11
Exposed
Surface Area