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Author Topic:   9.9 4STROKE NISSAN 18 CARB

TH posted 12-23-2002 04:59 PM ET (US)
I HAVE THIS MOTOR ON A 15FT MIRROCRAFT 440LBS IT WILL RUN 25 WITH 1 PERSON AND FISHING GEAR AM I RUNNING AT THE TOP OF THIS MOTORS ABILITY
JBCornwell posted 12-23-2002 06:19 PM ET (US)
Hi, TH.
Using the equation: Speed=(square root of HP/WT)X 200.
Where HP=18 and Wt=650 total,
I come up with a theoretical WOT of 33mph.
If I change the weight to 800, total, it changes to about 30mph.
Based on that I would say no, there is more speed available, but at the cost of accelleration.
If you can get a prop dealer to cooperate, try a Tachometer and see what your WOT rpm are and compare that to the engine spec for operating range.
Let us know what you find out.
Just a thought: I am not sure I would want to go faster than 25 in a Mirrocraft 15. How about a Whaler 13?
Red sky at night. . .
JB

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Author	Topic: 9.9 4STROKE NISSAN 18 CARB
TH	posted 12-23-2002 04:59 PM ET (US) I HAVE THIS MOTOR ON A 15FT MIRROCRAFT 440LBS IT WILL RUN 25 WITH 1 PERSON AND FISHING GEAR AM I RUNNING AT THE TOP OF THIS MOTORS ABILITY
JBCornwell	posted 12-23-2002 06:19 PM ET (US) Hi, TH. Using the equation: Speed=(square root of HP/WT)X 200. Where HP=18 and Wt=650 total, I come up with a theoretical WOT of 33mph. If I change the weight to 800, total, it changes to about 30mph. Based on that I would say no, there is more speed available, but at the cost of accelleration. If you can get a prop dealer to cooperate, try a Tachometer and see what your WOT rpm are and compare that to the engine spec for operating range. Let us know what you find out. Just a thought: I am not sure I would want to go faster than 25 in a Mirrocraft 15. How about a Whaler 13? Red sky at night. . . JB