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Author	Topic:   17' Alert propeller
PMUCCIOLO	posted 02-12-2002 03:25 AM ET (US)      My 2001 Alert has a 90HP Yamaha with a "Power Tech" propeller. The Yamaha dealer recommended this prop over the standard stainless Yamaha OEM prop, as it was represented to me as "high performance" and has ventilation holes in it near the bases of the blades. The prop seems to work well with a top RPM of 5,000. Does anyone have any experience with the quality and durability of this brand and application of propeller?
Bigshot	posted 02-12-2002 09:13 AM ET (US)             Tooo big. You should be getting closer to 5500WOT. My stock oem ss 17" Yamaha prop would spin 54-5500WOT.
FISHNFF	posted 02-13-2002 12:53 AM ET (US)             Try your black stainless Yamaha prop in a 19". You should get your RPM's back. Strange how props with identical numbers for size can differ so much. I run a 19" Yamaha SS prop on my 90 Merc 4S and turn 5800RPM light, 5200 loaded. A Ballistic 17" turns 5900RPM light, 5400 heavy. A Yamaha Pro SS 19" barely planed the boat and couldn't hit 5000. Go figure.
PMUCCIOLO	posted 02-13-2002 05:47 AM ET (US)          The owner's manual states that the full throttle operating range is 4500-5500 RPM's. Is it better to be in the midrange or higher up toward the maximum RPM's that the engine can turn?
Clark Roberts	posted 02-13-2002 06:29 AM ET (US)             It's best to prop so that, with light load, engine will rev to max rated rpm! This will allow engine to stay in "range" even when heavily loaded and hopefully prevent ever lugging engine. Performance will be better all around and engine will be happier... nothing as "doggy" and unsatisfying as an over propped engine (at least to me)! As a general rule of thumb, one inch of pitch will net 200rpm either up or down! And, as mentioned above, the style/design of the prop is also a big variable... Keep trying different props until you get rpm up to rated Max. At least that's my advice... go for it and happy Whalin'... Clark... Spruce Creek Navy
PMUCCIOLO	posted 02-14-2002 02:32 AM ET (US)          I am changing the prop to the black Yamaha SS OEM prop. I'll keep you posted! Thanks for the advice!
PMUCCIOLO	posted 03-08-2002 01:49 AM ET (US)          This just in...the OEM Yamaha prop did the trick! The motor now hits 5300 to 5400 RPM's wide open...and the boat feels like it is flying! I'm going to use a GPS for performance figures after the motor is broken in and off double oil. Thank you for your help! Paul
Bigshot	posted 03-08-2002 10:41 AM ET (US)             You are welcome!
Tom Byrum	posted 03-08-2002 11:23 AM ET (US)             So what kind of new boat are you gonna buy for your old prop?
PMUCCIOLO	posted 03-11-2002 12:23 AM ET (US)          I'm planning on buying a CPD 22 or 25 Guardian. The prop may be a bit small for that, however... Paul
peteinsf	posted 03-11-2002 10:01 PM ET (US)          Paul, I thought you settled on the CPD-22? Still itching for that BIG 25'? Pete
PMUCCIOLO	posted 03-12-2002 02:14 AM ET (US)          The only problem I have is, unfortunately, storage. If I can find space to accomodate the 25, I'm going to get that. Right now, it looks like I'm going to be limited to the 22 Guardian. Paul

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