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#1
08-13-2015, 09:33 AM
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just curious, I was looking at an older 20 Seacraft with a Yamaha 150 that was only burning 3 gallons per hour at cruise, why do you think your setup burned 3 times as much at cruise? Sure was a beautiful boat, and I like the name!
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#2
08-13-2015, 12:01 PM
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no 20 seacraft with a yamaha 150 burns 3gph at cruise.
3500 - 4000 rpm burn with a four stroke 150 yamaha is roughly 5 - 7.5 gph depending on load. This newer 21 seacraft is really a 23 hull (minus 2ft) . . . which is a MUCH larger hull than the 20.
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#3
08-13-2015, 02:26 PM
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i spoke to the owner of this boat Rick out of Savannah, GA and he reassured me that it burned 3-3.5 gallons per hour at cruise.
http://www.thehulltruth.com/boats-sa...tter-hull.html But the second part helps to make more sense, as it would be much heavier boat.
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#4
08-13-2015, 03:05 PM
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3-3.5 MPG at cruise is plausible, 3-3.5 GPH at cruise is about right for a 13' whaler but highly unlikely for a 20' or even 18' Seacraft...
Here is a reference I use for generalized fuel consumption http://www.boat-fuel-economy.com/yam...ion-us-gallons
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#5
08-13-2015, 07:54 PM
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Tom - That's a 1999 150 two stroke Saltwater Series II . . . 2.5 - 3 is MPG not GPH. There is NO WAY he's moving that boat at 2.5 - 3GPH except trolling at idle speeds.
 Here's a couple of similar setups from the yamaha motor's archive. http://yamahaoutboards.com/sites/def...0112-CEN-Z.pdf http://yamahaoutboards.com/sites/def...0175-CSK-Z.pdf http://yamahaoutboards.com/sites/def...0127-CSK-A.pdf
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