In early 2002, Bob Ogur purchased a 41 Tiara
Open with twin Cummins QSM 11 635hp engines. Bob
purchased
a spare set of Austral Propellers. Holland Propellers
tuned the props with Prop Scan.
Attached is the performance data
sheet. Left hand numbers are data collected with
Michigan Wheel stock CX400’s. Right hand numbers
are same sea trial, with Holland Propellers, Prop
Scan tuned, Australs.
| |
RPM
|
KNOTS
|
GPH
|
| |
|
Before
/ After
|
Before
/ After
|
| |
550
|
3.6
|
6.3
|
1.2
|
2.0
|
| |
600
|
6.7
|
6.8
|
1.2
|
1.4
|
| |
1000
|
9.4
|
9.7
|
4.75
|
5.0
|
* |
1500
|
17.2
|
18.8
|
13.75
|
12.6
|
* |
2000
|
28.9
|
29.7
|
22.05
|
20.6
|
* |
2100
|
30.6
|
31.4
|
24.3
|
23.7
|
* |
2200
|
32
|
32.8
|
26.85
|
26.3
|
| |
2300
|
33.3
|
34.1
|
29.8
|
30.5
|
| |
2340
|
34.1
|
34.9
|
31.6
|
33.0
|
Note fuel economy at 1500, 2000, 2100, and 2200.
Bob is very pleased with the increase in
performance and the fuel economy of his 41 Tiara
Open.
|
