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Jet Boats
General Jet Boat Discussions
Yamaha performance bulletin 40/30 vs 60/40
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<blockquote data-quote="Ranchero50" data-source="post: 357379" data-attributes="member: 1523"><p>A quick theory on jet pumps is mass x velocity = thrust. Mass of water, how fast it leaves the nozzle = how much thrust the pump delivers.</p><p></p><p>RPM is a function of mass, more water = more power needed to maintain RPM.</p><p></p><p>In hot rod mentality, mass it torque, velocity is horse power.</p><p></p><p>You need mass to move a load, velocity to move fast. </p><p></p><p>Kind of a garden hose vs. pressure washer deal.</p><p></p><p>Per the bulletins, there's only 10hp difference in the pumps, the ambient conditions nullify the comparison (temp, wind, weights). </p><p></p><p>In reference to different pumps, the pump needs to be matched to the engine or neither will perform correctly. Power curves and RPM range determine which pump setup is recommended.</p><p></p><p>Cornfused yet?</p></blockquote><p></p>
[QUOTE="Ranchero50, post: 357379, member: 1523"] A quick theory on jet pumps is mass x velocity = thrust. Mass of water, how fast it leaves the nozzle = how much thrust the pump delivers. RPM is a function of mass, more water = more power needed to maintain RPM. In hot rod mentality, mass it torque, velocity is horse power. You need mass to move a load, velocity to move fast. Kind of a garden hose vs. pressure washer deal. Per the bulletins, there's only 10hp difference in the pumps, the ambient conditions nullify the comparison (temp, wind, weights). In reference to different pumps, the pump needs to be matched to the engine or neither will perform correctly. Power curves and RPM range determine which pump setup is recommended. Cornfused yet? [/QUOTE]
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Jet Boats
General Jet Boat Discussions
Yamaha performance bulletin 40/30 vs 60/40
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