Originally posted by joe_db
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Prop Sizing and Placement
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Greg
1975 Alberg 30
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Greg, my ole E-35 MKII idled at about 15" of vac but at cruise I got 2100RPM's @ 6~7" of vac with the Indigo. I could go much harder when necessary but why bother as I was getting 6.2 kts with a 25'6" waterline.
Your engine is lugging bad if you are at anything under 4" @1450RPM's, IE only about 10HP. With the Indigo I could get 25~2600 wide open or about 25HP. I would guess the cruise load to of been around 15HP or just about a gallon an hour. Load duty gas engines make around 2HP per pound of fuel per hour when running well.
Dave Neptune
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Originally posted by Dave Neptune View PostYour engine is lugging bad if you are at anything under 4" @1450RPM's, IE only about 10HP. With the Indigo I could get 25~2600 wide open or about 25HP. I would guess the cruise load to of been around 15HP or just about a gallon an hour. Load duty gas engines make around 2HP per pound of fuel per hour when running well.
Dave NeptuneGreg
1975 Alberg 30
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