Go Back   Great Lakes 4x4. The largest offroad forum in the Midwest > Other Stuff > Boats, canoes, and rubber ducks
GL4x4 Live! GL4x4 Casino

Boats, canoes, and rubber ducks Chat about things that float







Search
Reply
 
Thread Tools
Old July 5th, 2009, 02:47 AM   #1
94transam25th
Senior Member
 
94transam25th's Avatar
 
Join Date: 04-17-07
Location: Utica/MI
Posts: 757
iTrader: (1)
Mentioned: 0 Post(s)
Default Prop problem??

Ok so i am new to owning a boat, my dad has had boats all my life but i just bought my first boat last week and had it out today and doesnt seem right i think its a prop problem

here it goes.

on the boat when i got it it had a 19pitch prop and those little dolphins on the outdrive... it takes quite awhile to plane and seems like it will run way too high of rpm. if i let it go wide open throttle it would go all the way to 5500 or maybe even above just didnt want to try and only doing 32 mph gps... also i pretty much had to keep the trim all the way down otherwise the rpm would get too high

my dad gave me a 23p mirage stainless steel prop do you think i will even be able to plane with this since i had trouble planing a 19p?

the boat is an 86 cobalt with 5.7v8 260 and alpha one seems to me it should do faster than 32

any suggestions?
94transam25th is offline   Reply With Quote
Old July 5th, 2009, 08:57 AM   #2
JeepRat
Infidel
 
JeepRat's Avatar
 
Join Date: 11-05-05
Location: Clarkston
Posts: 492
iTrader: (16)
Mentioned: 0 Post(s)
Default

Read through this Michigan Wheel Catalog. It will give you an idea of where you should be with a prop. It may still take testing a couple to get you in the right RPM range.
http://www.miwheel.com/FilesCustom/HTMLEditor/Files/MWC%20-%20OBSD%2009.pdf

Something else you can look into is Smart Tabs http://www.nauticusinc.com/

Last edited by JeepRat; July 5th, 2009 at 09:18 AM.
JeepRat is offline   Reply With Quote
Old July 5th, 2009, 10:14 AM   #3
firehawk
Live Action!
 
firehawk's Avatar
 
Join Date: 10-02-07
Location: Clawson, Michigan
Posts: 12,323
iTrader: (43)
Mentioned: 5 Post(s)
Default

What pitch prop came with it?
firehawk is offline   Reply With Quote
Old July 5th, 2009, 11:26 AM   #4
94transam25th
Senior Member
 
94transam25th's Avatar
 
Join Date: 04-17-07
Location: Utica/MI
Posts: 757
iTrader: (1)
Mentioned: 0 Post(s)
Default

it came with a 19pitch but if i would let it rev out it would go all the way to 6k rpm i bet

and only hitting 32 mph with this setup seems way to slow
94transam25th is offline   Reply With Quote
Old July 5th, 2009, 09:45 PM   #5
firehawk
Live Action!
 
firehawk's Avatar
 
Join Date: 10-02-07
Location: Clawson, Michigan
Posts: 12,323
iTrader: (43)
Mentioned: 5 Post(s)
Default

Sounds like the prop your dad have you is a step in the right direction unless there is a problem elsewhere.

Post up the results.
firehawk is offline   Reply With Quote
Old July 6th, 2009, 12:02 AM   #6
94transam25th
Senior Member
 
94transam25th's Avatar
 
Join Date: 04-17-07
Location: Utica/MI
Posts: 757
iTrader: (1)
Mentioned: 0 Post(s)
Default

i put the 23 pitch on and am a lot happier with that than the 19p... i had 9 people and a full tank of gas and gps'ed at 40 in pretty rough water so about a lil more than 4k rpm im thinking if i can find a good 21p i will be good because the 23 took awhile to plane
94transam25th is offline   Reply With Quote
Old July 6th, 2009, 06:51 AM   #7
greygoose
I'm the dude
 
greygoose's Avatar
 
Join Date: 02-18-08
Location: New Baltimore / Presque Isle
Posts: 6,081
iTrader: (1)
Mentioned: 0 Post(s)
Default

Quote:
Originally Posted by 94transam25th View Post
i put the 23 pitch on and am a lot happier with that than the 19p... i had 9 people and a full tank of gas and gps'ed at 40 in pretty rough water so about a lil more than 4k rpm im thinking if i can find a good 21p i will be good because the 23 took awhile to plane
Yeah, 23p is a little much for a small block. 21p sounds like it would work well for you. You forgot to mention prop size though, because different diameters make a difference in plane time and rpms as well.
greygoose is online now   Reply With Quote
Old July 7th, 2009, 05:05 PM   #8
94transam25th
Senior Member
 
94transam25th's Avatar
 
Join Date: 04-17-07
Location: Utica/MI
Posts: 757
iTrader: (1)
Mentioned: 0 Post(s)
Default

im pretty sure all 3 props i have are 14 inch
94transam25th is offline   Reply With Quote
Reply
Great Lakes 4x4. The largest offroad forum in the Midwest > Other Stuff > Boats, canoes, and rubber ducks
Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



All times are GMT -5. The time now is 05:07 AM.


Powered by: vBulletin, Copyright 2000 - 2012, Jelsoft Enterprises Ltd.
User Alert System provided by Advanced User Tagging (Lite) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd. Runs best on HiVelocity Hosting.
Copyright 2005 - 2012 Cracker Enterprises - Powered by Linux
vB Ad Management by =RedTyger=
Page generated in 0.12259 seconds with 28 queries