Reply
 
Thread Tools Search this Thread Display Modes
 
Old 12-30-2009, 02:48 AM   #1
Ensign
 
Join Date: Jul 2009
Location: Appleton, WI
Posts: 4
Send a message via Yahoo to ajo_forever
Default Need help with 70 force

Hey all! I have a 1992 1700XR with a 70 force on it, the prop seems really small for the boat, and was wondering if anyone had a suggestion for a prop size.

Thanks!
__________________

ajo_forever is offline   Reply With Quote
Old 12-30-2009, 03:19 AM   #2
Admiral

 
seapuppy's Avatar
 
Join Date: Nov 2005
Location: Everett Wa
Posts: 4,681
Default

welcome to the new zoo.....what prop size do you have now??


SP
__________________

seapuppy is offline   Reply With Quote
Old 12-30-2009, 04:13 AM   #3
Commander
 
tglee's Avatar
 
Join Date: Feb 2007
Location: PA
Posts: 331
Default

Try 10 1/8 X 15.
__________________
"Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote."

MMSI# 338052622
tglee is offline   Reply With Quote
Old 12-30-2009, 04:06 PM   #4
Moderator

 
Join Date: Apr 2008
Posts: 3,562
Default

I would focus on what the manufacturer's recommended Max. RPM Range for the motor at full throttle. Then see where you're actually running at, at Wide Open Throttle (WOT).

Manufacturer Max. RPM > Actual WOT RPM = Overpropped

Manufacturer Max. RPM < Actual WOT RPM = Underpropped

This is, of course, assuming that there are not other variables affecting performance, such as :

dirty hull/growth on bottom
spun hub
engine is running clean (timing, compression, carb., etc)
boat isn't overweighted

These are just general rules of thumb to go by. Are you having specific problems?
shrew is offline   Reply With Quote
Old 12-31-2009, 03:06 AM   #5
Commander
 
tglee's Avatar
 
Join Date: Feb 2007
Location: PA
Posts: 331
Default

Quote:
I would focus on what the manufacturer's recommended Max. RPM Range for the motor at full throttle.
Max WOT should be 5500 RPM.

10 1/8 X 15 was the OEM prop for this boat.
__________________
"Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote."

MMSI# 338052622
tglee is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Powered by vBadvanced CMPS v3.2.3

All times are GMT. The time now is 09:36 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2017, vBulletin Solutions, Inc.