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"41 Tiara Open, better speeds and better fuel economy"

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.

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