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| Repower Articles |
| Bossea - Repowering a Trojan International 10 Meter |
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| BOSSEA is a 1985 model Trojan
International 10 Meter Flybridge Sedan, built by Trojan/Bertram in Lancaster,
Pennsylvania. It was originally powered with twin Detroit Diesel 8.2L engines
rated at 250 HP at 3000 RPM. The engines were equipped with 1.5:1 TwinDisc
gears turning 1 3/8 inch shafts and 18x20 3-blade Nibral props with a medium
cup. In late 2000, these engines had just over 1000 hours and were trouble-free,
yet the overall performance of BOSSEA was less than desired. With a full
load, BOSSEA displaced an estimated 19000 to 20000 pounds, and was capable
of 22-23 knots at the top end in calm conditions. |
| Top RPM achieved was approximately 2900
RPM, suggesting a modest over-propping. She would cruise at 18 knots at
2700 RPM in the same conditions, and get around 3/4 nm/gal. In the more
typical boating conditions found off the Southern California coast, BOSSEA
would top out at 19-20 knots and cruise at 16-17 knots. This may not seem
too bad, but in actual conditions it was extremely difficult to maintain
a steady cruise speed of 16-17 knots, especially with following seas. Going
up the back side of a wave would naturally drop the stern, and speed would
be reduced to12-13 knots, right at the point where the boat fell off plane.
This was with trim tabs all the way down. So the typical experience was
that a good deal of time was spent getting onto plane, falling off, then
climbing back on again. It seemed obvious that BOSSEA needed a little more
get-up-and-go to perform to her potential. Because the boat was in otherwise
great condition, repowering seemed to be a reasonable way to solve the problem.
The next step was to figure out what to repower with. |
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