journey on
New member
Well, Pat, congratulations. And yes 15 mph is flying when you're used to 7 mph.
GPH represents the work done both on shoving that boat through the water and overcoming the internal friction of the outboard. Whatever the pitch, at any given speed you're shoving the same boat through and over the water. With your 11" pitch, just think of it as second gear. So, you ought to compare the boat speed through the water.
The table you show is for a very, very lightly loaded boat and for 15 mph, they got 4 MPG/4GPH. I've never reached those figures with Journey On loaded for cruising. For 15 knts (~17 mph), I've seen around ~8 g/hr.
So for your heavily loaded boat and an 11" pitch, you did well.
Boris
PS> And, by the way, I've never seen 31 mph at 5500 rpm, or at any rpm.
GPH represents the work done both on shoving that boat through the water and overcoming the internal friction of the outboard. Whatever the pitch, at any given speed you're shoving the same boat through and over the water. With your 11" pitch, just think of it as second gear. So, you ought to compare the boat speed through the water.
The table you show is for a very, very lightly loaded boat and for 15 mph, they got 4 MPG/4GPH. I've never reached those figures with Journey On loaded for cruising. For 15 knts (~17 mph), I've seen around ~8 g/hr.
So for your heavily loaded boat and an 11" pitch, you did well.
Boris
PS> And, by the way, I've never seen 31 mph at 5500 rpm, or at any rpm.