Electric auxiliary engine
- I was looking at this issue of MIB and noticing what an intrusion the
engine compartment made in Bolger's small cruiser.
Wheels started turning in my head, did a little math and concluded
that a hybrid electric set up would be possible. Using 2 90 amp
12 V alternators to produce about 120 amps would convert to
about 2 hp. It might take a 8 or 10 hp engine to run them but
a 2 hp electric motor will do about the same work as a 4 or 5 hp
IC engine You would not necessarily need a IC engine capable
of developing full power of the electric motor. The battery bank
could greatly increases the output of the electric motor for fairly
lone periods of time.
I see several advantages to the system. First the motor starts
instantly every time when running off batteries. The shaft can be
parallel to the thrust line because the motor can be mounted
in the keel. You have a great deal more control of the motor
a low RPM. The IC motor does not have sit smack in the middle
of the boat just where you want to be it could be mounted to one
side under the seat and the batteries mounted on the opposite side
to balance the weight. Most of the time you could run on batteries
alone with no need of the IC engine. Some folks would probably
not even install and IC engine If all they needed and auxiliary for
was to clear the harbor and maneuver in tight spots.
I see a few draw backs as well. Over all higher cost. More parts
make more places for problems and more cost of maintenance. Poorer
over all efficiency. If you had to make a long run on the auxiliary you
would probably need a bigger IC engine to get the same performance
as a conventional set up.
Just some thoughts.
Gordon Couger gcouger@...
Stillwater, OK www.couger.com/gcouger
405 624-2855 GMT -6:00