| Attached is a propeller performance report sent to us
by Chuck Klima.
Propeller Performance
2000
Tiara 3500 Express, 450 Cummins “C" engines,
2400 cruise, 2600 max
When new, these engines were broken in very carefully
as per DW’s instructions.
Propeller: Before, Michigan 24x27x3, #8 cup
After, Michigan 24x27x3, reworked by Holland Propeller
(same props).
Date: May 21,2003
Place: Bay of Green Bay, near Death’s Door.
Air Temp: 50
Water Temp: 42
Wind: light and variable
Waves: 6" chop, some small rollers
POB: 2
Fuel/water/waste: 100% / 40% / 5%
Gear: Lots. I didn’t know you could put this
much stuff on a boat.
Other: 4 transducers in hull (don’t ask), full
complement of electronics on the arch
Canvas: Camper top up, side windows in, no side or rear
curtains
“Before" is typical of what the boat would
do last year under similar conditions. “After" is
today. Speed is measured with my DGPS. No fuel consumption
data available.
| |
Before |
After |
| Speed @ 2400 rpm |
28.5kn |
29.8kn |
| Speed @ full throttle |
31.6kn |
32.6kn |
RPM @ full throttle |
|
|
| Port |
2720 |
2720 |
| Starboard |
2710 |
2680 |
(According
to DW, the starboard throttle won’t
quite go all the way up.)
Subjective judgments:
I
was a little concerned that adding pitch would make
the boat harder
to get up on the plane, but once the
turbo's kick in you’ve got to hang on, if anything
it is better.
I
did not previously think I had any particular vibration
problems, but I guess I did, these props are smooth as
silk-quieter too. The lack of vibration is almost eerie,
Prop Scan is amazing.
|
