Tuesday,
April 22, 2003
by
Beckie-Anne Thain
Today we tested our thrusters.
Unfortunately our 1000 Mayfair bilge pump motors were drawing
about 10 amps, when they were only designed to draw about four.
If our thrusters continued this way, they would all burn out.
This puzzled us, but our mentor, Harry
Bohm, pointed out that it was caused by our propellers. Because
our propellers were too big, they required more power to turn
at the same speed as smaller propellers—that’s why
our motors pulled 10 amps instead of four. Now, instead of eight-centimetre
diameter propellers, we have four-centimetre diameter Dumas
propellers and our motors are back to pulling four amps.
Introduction
|
April
22, 2003 |
| November
25, 2002 |
April
28, 2003 |
| November
28, 2002 |
May
2, 2003 |
| December
5, 2002 |
May
12, 2003 |
| December
19, 2002 |
May
19, 2003 |
| January
23, 2002 |
May
26, 2003 |
| January
30, 2003 |
June
3, 2003 |
| February
13, 2003 |
June
10, 2003 |
| February
28, 2003 |
June
19, 2003 |
| March
7, 2003 |
June
20, 2003 |
| March
14, 2003 |
June
21, 2003 |
| March
20, 2003 |
|
|
| Dumas four centimetres (left) Master Airscrew eight
centimetres (right) |
|
