Propeller options and weight of my 76 SeaCraft

jimi2004 · #1 08-23-2005, 11:20 PM

Hi, I am new to this forum. I'd like to know how to find the weight of my 1976 23'6" SeaCraft so I can choose the proper prop. I have a 14 3/4 x 19 with a 1999 200 Johnson, and it only turns 4900 when it should turn about 5300. Thanks for any help. I plan to add some photos of my new boat soon. -- Jay.

SEAFARI · #2 08-23-2005, 11:37 PM

Jay
A 15" prop should do it. You want to run
that motor loose, say 5500 rpm.

Capt Chuck · #3 08-24-2005, 11:09 PM

Welcome to CSC 76dream

Something is not kosher here. Are you running a aluminum or a SS prop [img]/images/graemlins/confused.gif[/img] I was running 14 3/4 x 17 many years ago on a 200hp Johnson on my 23'. I was hitting around 5500 at WOT. When I repowered to a 222hp Johnson I switched to a 14 3/4 x 19 Viper SS. I am now using the same prop on my 1999 250hp Johnson. I'm topping out at 5800 WOT.

Depending on your fuel tank size here's the specs:
click here---------->http://www.classicseacraft.com/brochure/SF23Specs.jpg

jimi2004 · #4 08-24-2005, 11:24 PM

Thank you.It is a ss viper prop. Do you think a 17 will make that big of a difference? I hope I dont have motor problems.

lost2a6 · #5 08-25-2005, 12:07 AM

I'm running a 17 pitch on my 200 Yamaha, which is on a 23 Sceptre. My RPM's are 5500 trimmed out to just before the prop starts to cavitate. I would think that a 17 would be perfect in your application.

ScottM · #6 08-25-2005, 11:31 AM

76dream,
Dropping 2 inches of pitch should give you another 200-300 rpm on the top end.

Sleeto · #7 08-25-2005, 03:06 PM

How do you determine the pitch of a prop?

What should my RPM's be at WOT for my 250 hp?

[img]/images/graemlins/confused.gif[/img]

ScottM · #8 08-25-2005, 03:37 PM

Paul,
Your prop should be stamped with the diameter and pitch, something like 15X19. If you have an aftermarket prop with just a part #, ask the mfg for the specs.

Not sure about your engine's operating range, but I would think 5300-5600 rpm.

Capt Chuck · #9 08-25-2005, 09:35 AM

Quote:

Something is not kosher here. Are you running a aluminum or a SS prop I was running 14 3/4 x 17 many years ago on a 200hp Johnson on my 23'. I was hitting around 5500 at WOT. When I repowered to a 222hp Johnson I switched to a 14 3/4 x 19 Viper SS. I am now using the same prop on my 1999 250hp Johnson. I'm topping out at 5800 WOT.

Boy did I make a mistake [img]/images/graemlins/frown.gif[/img] I am turning a 14 3/4 x 17 prop. It was the 19" that was on my 200hp. Sorry for mis leading you. Sometimes your repair shop will lend you different props to try out before you purchase [img]/images/graemlins/wink.gif[/img]