|
| |
The Electric Boat Association provides
technical
information and support in a number of ways: |
- The Suppliers Directory of our website provides an extensive list of products and
services provided by EBA Business Members together with
address and contact details. Click
here
- Regular articles in our
magazine Electric Boat News, received by all EBA members,
include technical reports
covering a wide variety of topics. As an example, you may like to
read his article on batteries and battery maintenance – one of the
topics most requested by our membership.
Click
here
- We produce a series of
Information Sheets covering a variety of technical subjects (see
list below). These are free to members and may be obtained from EBA
Secretary Barbara Penniall -
e-mail:
- This section also includes
information on books about electric boating, and two spreadsheets
for calculating hull drag and power (see below).
List of Information Sheets Available
- Solar Photovoltaics - Paul Lynn
- Electrifying Your Boat - Hawthorne & Wagstaffe
- Hull Design for Electric Boats - Andrew N. Wolstenholme
- Lead-Acid Batteries - Operation &
Maintenance
- CMP Batteries
- High Speed Electric Boats - Lorne
Campbell
- Hybrid Power - John Hustwick
- Trailers & Towing - Paul Lynn
- Fitting Out & Laying Up - John Hustwick and Ian Rutter
(covers all aspects of trailing, launching and recovering your boat and tips
for getting
your boat ready for the cruising season and laying up at the end
of the season)
|
|
Books |
|
|
Electric Boats
on the Thames 1889-1914
by Edward HawthorneFor the
electric boat builder, Edwardian era launches of the River
Thames are pictured, mostly of the past but some of the present,
restored or replicated. This thoroughly researched illustrated history
describes the first electric motors, the boatyards, the variety of
boats, and the economics of rental electric boat fleets.
ISBN No.
0750910151 (no longer in print but watch out
for it in
libraries & second-hand bookshops) |
Edward Hawthorne has also written about the history of electric
boating in the
History Section of
this website
|
|
 |
Electric Propulsion for Boats
by Charles Mathys (Paperback)
ISBN No. 1892216493
(see Paul Lynn's review
in the Winter 2004/2005 issue of EB News) |
| Hull drag and
power – useful calculation spreadsheets |
| EBA member Theo Schmidt has provided two spreadsheets to
quickly determine the "best case" drag and power for a craft of
any size with a smooth surface, no disturbances like immersed transoms,
and traveling at a speed where the wave-making is negligible. All that
is needed as input is the wetted surface area, the speed, and the
approximate length.
The spreadsheet also allows setting the medium to "air" and thus gives
the drag and power of an equivalent optimal airship hull, e.g. an
optimal fairing for reducing wind resistance. Click to
download Excel file: drag.xls |
|
 |
|
Theo Schmidt has provided a second spreadsheet to do the same
calculation but also allows inputting of various efficiencies, the
battery voltage, and the dimensions of the boat's
wiring. It then gives the actual electrical motor power and the power
required form the battery. e.g. by using a propeller efficiency of 90%,
a transmission efficiency of 100% (no gearing), and a motor
efficiency of 90%, and very thick copper wiring, this then gives a
"best case" for the electrical values as well.
In practice one will want to use more conservative efficiency values and
perhaps degrade the hydrodynamic values somewhat by entering a higher
value of wetted surface, as few boats will be as clean as the
rowing shells used for the data. |
|
Click to download Excel file:
EBcalc.xls |
|
