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Don,
Can you further expand upon what is needed for the prop between the flat bottom and kicked up tub bottom?
Mike
Rigger Design
- Thread starter TOM DRIVER
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Can you further expand upon what is needed for the prop between the flat bottom and kicked up tub bottom?
Mike
dwilfong
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Do you think that imparting lift in the prop takes power that could be used to run more pitch?
In other words dose putting lift in a prop take more power to run than a non lifting prop of the same pitch?
David
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Great video here , look at the foils on the long power shaft on the old italian boat .
dwilfong
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WOW Tom brought back fond memory's of my youth. My first boat had a MARK 75 on it. love the pull start on this video to get it going.
My batt was always dead and pulling it was the only way to get going.
I live about 6 miles from lake X here in Saint Cloud FL. took a ride over there and the old bubble tower is still standing. The Osceola Sheriffs department has it now as a training camp.
Great stuff.
David
Mike,
Generally a flat bottom or kick-up tub with rear sponsons can run the same prop. Its when you remove them that the prop comes into play. Most of us never think of the transom as having an AOA, and for the most part it does not, accept when launching & going very slow the transom drops and creates AOA. With kick-up the AOA is reversed at normal speed. So now when launching, going slow, the AOA is close to zero & you have a long flat surface in contact with the water that is very, very hard to lift. Hope I said this right...
David,
That is a good ? I don't know, but I would think if you add lift to a non lifting prop it would take less power because it wold be less efficient.
Don
Generally a flat bottom or kick-up tub with rear sponsons can run the same prop. Its when you remove them that the prop comes into play. Most of us never think of the transom as having an AOA, and for the most part it does not, accept when launching & going very slow the transom drops and creates AOA. With kick-up the AOA is reversed at normal speed. So now when launching, going slow, the AOA is close to zero & you have a long flat surface in contact with the water that is very, very hard to lift. Hope I said this right...
David,
That is a good ? I don't know, but I would think if you add lift to a non lifting prop it would take less power because it wold be less efficient.
Don
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