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Author Topic:   my new baby

valerio posted 02-19-2004 10:27 AM ET (US)
hi guys, i'm writing from italy. i have just purchased in usa an used 28 conquest of 2000 with 2 x 225 optimax. used the first time last suturday and very disappointed about the performances. taking off from the water only a 5000 rpm and running at 28/30 knots with 4800/4999 rpm. too much in my opinion and as written everiywhere into the magazines. very high consumption of gasoline. all the measures (trims, tabs, etc...) had no efficacy to change and ameliorate the performances. sea perfect, no wind, only 2 persons on board, half tank. so ideal conditions. engines are perfect and checked by mercury. props are also perfect. cannot understand these performances. can someone help me please ? hanks. ciao from Italy !
cyrez00 posted 02-20-2004 04:04 AM ET (US)
I'm not an expert like others here on the forum but i do know that when you have a rev issue it's most of the time the wrong pitch on your props.
Good luck.
Marc.
Clark Roberts posted 02-20-2004 06:45 AM ET (US)
You need props with less pitch to let engine gain about 600-800 revolutions per minute (rpm). You will destroy those engines running at 5000rpm at wide open throttle (WOT). Generally one inch of pitch equates to 200rpm either up or down so that would indicate that you need to reduce propeller pitch by 3 to 4 inches to gain the needed 600-800rpm. I'm assuming that you had engines trimmed out properly and that there are no problems with the engine installations...etc. happy Whalin'... Clark.. Spruce Creek Navy

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Author	Topic: my new baby
valerio	posted 02-19-2004 10:27 AM ET (US) hi guys, i'm writing from italy. i have just purchased in usa an used 28 conquest of 2000 with 2 x 225 optimax. used the first time last suturday and very disappointed about the performances. taking off from the water only a 5000 rpm and running at 28/30 knots with 4800/4999 rpm. too much in my opinion and as written everiywhere into the magazines. very high consumption of gasoline. all the measures (trims, tabs, etc...) had no efficacy to change and ameliorate the performances. sea perfect, no wind, only 2 persons on board, half tank. so ideal conditions. engines are perfect and checked by mercury. props are also perfect. cannot understand these performances. can someone help me please ? hanks. ciao from Italy !
cyrez00	posted 02-20-2004 04:04 AM ET (US) I'm not an expert like others here on the forum but i do know that when you have a rev issue it's most of the time the wrong pitch on your props. Good luck. Marc.
Clark Roberts	posted 02-20-2004 06:45 AM ET (US) You need props with less pitch to let engine gain about 600-800 revolutions per minute (rpm). You will destroy those engines running at 5000rpm at wide open throttle (WOT). Generally one inch of pitch equates to 200rpm either up or down so that would indicate that you need to reduce propeller pitch by 3 to 4 inches to gain the needed 600-800rpm. I'm assuming that you had engines trimmed out properly and that there are no problems with the engine installations...etc. happy Whalin'... Clark.. Spruce Creek Navy