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Tender problem, maybe
On 6/5/2012 10:36 AM, JustWait wrote:
On 6/5/2012 10:28 AM, Oscar wrote: The facts: 9'X5' inflatable with inflatable keel and hard floor. 5hp 4 stroke engine. 7 1/2 X 7 3 blade prop. Here's what's happening: Engine runs smooth as silk. At about 1/2 throttle GPS measures 4 1/2 MPH At full throttle GPS measures a little over 5MPH There is no noticeable change in pitch or DB between 1/2 and full throttle. Engine doesn't seem to be bogging down. Speed increase between 1/2 and full throttle is gradual even though throttle is advanced quickly. Boat bottom is clean. Prop is in excellent shape. Questions: Is this normal? Should I try a lower pitched prop? Do I need more Horsepower? What do you think? Hull speed is hull speed. At a point a boat will just not go any faster no matter how much power you put to it, until you break the bow wave and go on plane... Without doing the calculations, 4 1/2 sounds about dead on for "hull speed" on the soft sided, hard bottom raft. Thanks. I suspect you are right. |
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